错误如下:
Traceback (most recent call last):
File "***/pyscript/TimeTask.py", line 11, in <module>
schedule.every().day.at("13:01").do(job())
File "***/venv/lib/python3.6/site-packages/schedule/__init__.py", line 385, in do
self.job_func = functools.partial(job_func, *args, **kwargs)
TypeError: the first argument must be callable
查看do这个方法到底长什么样
def do(self, job_func, *args, **kwargs):
Specifies the job_func that should be called every time the
job runs.
Any additional arguments are passed on to job_func when
the job runs.
:param job_func: The function to be scheduled
:return: The invoked job instance
self代表调用函数的实例,相关链接:http://python.jobbole.com/81921/
其实job_func 才是第一个参数,也就是我们需要执行的方法。
在仔细查看官方实例之后发现他是这样调用的
官方链接:https://schedule.readthedocs.io/en/stable/
schedule.every().day.at("10:30").do(job)
方法名后面不带括号,就可以执行成功。
网上查找了相关的解释,说是带括号代表方法的返回值,不带括号代表方法本身。
可能想问,要是定时任务方法带着参数怎么办?
再回过来看,第二个参数*arg 是可以为方法添加参数的。
class partial:
"""New function with partial application of the given arguments
and keywords.
__slots__ = "func", "args", "keywords", "__dict__", "__weakref__&qu
The Future of Retail - To the extent that there are two distinct sides to the argument, the position of
Offline-to-Online (O2O) advocates is that, as more offline retailers are closing,
brick-and-mortar stores, the transaction volumes for online stores will only
continue to grow. For brick-and-mortar stores to survive, O2O — driving customers to
a physical storefront to fulfill the transaction with online incentives — will absolutely
come to dominate retail sales.
CHAPTER 1
About Python ............................................................................................1
What Is Python? ................................................................................................................1
A Brief History of Python ................................................................................................2
Interpreters Versus Compilers .......................................................................................5
When to Use (or Not Use) an Interpreted Language .........................................8
Understanding Bytecodes ......................................................................................10
Why Use Python? ...........................................................................................................11
Object-Oriented ........................................................................................................11
Cross Platform ..........................................................................................................11
Broad User Base .......................................................................................................11
Well Supported in Third-Party Tools ...................................................................12
Good Selection of Tools Available ........................................................................12
Good Selection of Pre-built Libraries ..................................................................12
Where Is Python Used? .................................................................................................13
How Is Python Licensed? ..............................................................................................13
Where Do I Get Python? ...............................................................................................14
Installing Python ............................................................................................................14
Getting Information on Python ..................................................................................16
Python Communities .....................................................................................................17
Other Software ................................................................................................................18
And Now for Something Completely Different… ....................................................18
CHAPTER 2
Python Language Overview .................................................................19
Python Syntax .................................................................................................................20
Comments .................................................................................................................20
Indentation ...............................................................................................................20
Contents
TABLE OF}
Q Q Q
Python Reserved Words ................................................................................................24
Decision Making and Iteration Keywords ..........................................................25
Debugging Keywords ..............................................................................................27
Package and Module Handling Keywords .........................................................27
Exception Handling Keywords ..............................................................................29
General Language Keywords .................................................................................31
Other Keywords ........................................................................................................32
Variable Usage ................................................................................................................34
The Continuation Variable ....................................................................................36
Watching Out for Spelling Mistakes! ..................................................................37
Predicates .........................................................................................................................38
Identifier Scope ...............................................................................................................39
Operators .........................................................................................................................42
Modulo Operator .....................................................................................................44
Exponential Operator .............................................................................................46
Logical Operators ....................................................................................................46
Comparative Operators ..........................................................................................49
Bitwise Operators ....................................................................................................51
Membership Operators and String Operators ..................................................53
Identity Operators ...................................................................................................53
In Conclusion ..................................................................................................................53
CHAPTER 3
Tools ..........................................................................................................55
IDLE ...................................................................................................................................55
File Menu ...................................................................................................................57
The Path Browser Dialog ........................................................................................62
Edit Menu ..................................................................................................................64
Shell Menu .................................................................................................................70
Debug Menu ..............................................................................................................71
The Edit Window ......................................................................................................79
Format Menu ............................................................................................................80
CONTENTS
Q Q Q
Command Line Compiler ..............................................................................................90
Creating Python Files ....................................................................................................93
Documentation ...............................................................................................................95
In Conclusion ..................................................................................................................96
CHAPTER 4
Data Types ...............................................................................................97
Numeric Types ................................................................................................................98
Integers ......................................................................................................................98
Demonstrating Long Integers ...............................................................................99
Octal and Hexadecimal ........................................................................................100
Floating Point Numbers .............................................................................................101
Strings ............................................................................................................................103
String Variables .....................................................................................................103
Concatenating Strings .........................................................................................106
Repeating Strings ..................................................................................................107
Substrings ...............................................................................................................108
Slicing ......................................................................................................................110
String Functions ....................................................................................................111
String Constants ....................................................................................................112
Conversion Functions ...........................................................................................114
Search Functions ...................................................................................................118
Formatting Functions ..........................................................................................120
Escape Sequences ..................................................................................................121
Sequences ......................................................................................................................122
Lists ..........................................................................................................................123
Shared References .................................................................................................128
Tuples .......................................................................................................................128
Dictionaries ............................................................................................................132
Advanced Type .............................................................................................................136
Classes and Objects ..............................................................................................136
Complex Type .........................................................................................................137
Generator Type ......................................................................................................138
CONTENTS
Q Q Q
None Type ...............................................................................................................139
Unicode Type ..........................................................................................................140
In Conclusion ................................................................................................................141
CHAPTER 5
Control Flow .........................................................................................143
Conditionals ..................................................................................................................144
The if Statement ..................................................................................................144
The elif Statement .............................................................................................147
The else Statement .............................................................................................149
Wrapping Up the Conditionals: A Cool Example ...........................................150
Loops ..............................................................................................................................153
The for Loop ..........................................................................................................153
The while Loop .....................................................................................................161
In Conclusion ................................................................................................................164
CHAPTER 6
Input and Output ................................................................................165
User Input ......................................................................................................................165
The input Function ..............................................................................................166
The raw_input Function ....................................................................................168
User Output ...................................................................................................................170
Formatting ..............................................................................................................172
File Input .......................................................................................................................175
File Output ....................................................................................................................177
Closing Files ..................................................................................................................179
Positioning in Files ......................................................................................................180
Directories and Files ...................................................................................................183
The stat Module: File Statistics ..............................................................................186
Command Line Arguments ........................................................................................190
Pickle ..............................................................................................................................192
In Conclusion ................................................................................................................195
CONTENTS
Q Q Q
CHAPTER 7
Functions and Modules .....................................................................197
What Is a Function? ....................................................................................................197
Defining Functions in Python ...................................................................................197
What Are Arguments? ................................................................................................200
How Do You Pass an Argument to a Function? ....................................................201
Default Arguments ......................................................................................................203
Variable Default Arguments .....................................................................................205
Keyword Arguments ....................................................................................................206
Returning Values from Functions ............................................................................207
Returning Multiple Values from Functions ...........................................................209
Recursive Functions ....................................................................................................210
Passing Functions as Arguments .............................................................................212
Lambda Functions .......................................................................................................213
Variable Numbers of Arguments to a Function ....................................................215
Variable Scope in Functions ......................................................................................216
Using Modules ..............................................................................................................218
In Conclusion ................................................................................................................219
CHAPTER 8
Exception Handling ............................................................................221
Looking at Exceptions in Python ..............................................................................222
Traceback Example ......................................................................................................223
Understanding Tracebacks ........................................................................................224
Exceptions .....................................................................................................................225
Catching Exceptions with try..except .........................................................226
Multiple except Clauses .....................................................................................229
Blank except Clauses ..........................................................................................231
The else Clauses .........................................................................................................232
The finally Clause ....................................................................................................234
Raising Your Own Exceptions ...................................................................................235
Exception Arguments .................................................................................................237
User-Defined Exceptions ............................................................................................238
Working with the Exception Information ..............................................................239
CONTENTS
Q Q Q
exc_type ................................................................................................................239
exc_value ..............................................................................................................240
Using the with Clause for Files ................................................................................243
Re-throwing Exceptions .............................................................................................244
In Conclusion ................................................................................................................246
CHAPTER 9
Object-Oriented Programming .........................................................247
A Brief History of OOP ................................................................................................247
What Is an Object? ......................................................................................................248
Why Do We Use Objects? ...........................................................................................249
Reuse ........................................................................................................................249
Ease in Debugging .................................................................................................250
Maintainability ......................................................................................................250
The Attributes of Object-Oriented Development .................................................251
Abstraction .............................................................................................................251
Data Hiding ............................................................................................................252
Inheritance .............................................................................................................253
Polymorphism ........................................................................................................255
Terminology ..................................................................................................................256
Class .........................................................................................................................256
Object .......................................................................................................................256
Attribute ..................................................................................................................257
Method ....................................................................................................................258
Message Passing ....................................................................................................259
Event Handling ......................................................................................................260
Derivation ...............................................................................................................260
Coupling ..................................................................................................................261
Cohesion ..................................................................................................................261
Constants ................................................................................................................261
Other Concepts .............................................................................................................262
In Conclusion ................................................................................................................262
CONTENTS
Q Q Q
CHAPTER 10
Classes and Objects in Python ..........................................................265
Python Classes ..............................................................................................................265
Properties ......................................................................................................................267
Attribute Modifying Functions .................................................................................272
Private Attributes ........................................................................................................274
Doc Strings ....................................................................................................................275
Properties ......................................................................................................................277
The self Object ...........................................................................................................279
Methods .........................................................................................................................281
Special Methods ...........................................................................................................283
Initialization ...........................................................................................................283
Termination ............................................................................................................284
String Conversion ..................................................................................................285
Inheritance ....................................................................................................................287
Multiple Inheritance ...................................................................................................291
Using super ..................................................................................................................293
Polymorphism ..............................................................................................................295
Exception Classes .........................................................................................................297
Iterators .........................................................................................................................299
Operator Overloading .................................................................................................301
In Conclusion ................................................................................................................304
CHAPTER 11
The Python Library ..............................................................................305
Containers .....................................................................................................................305
Working with the deque Class ...........................................................................306
Math ................................................................................................................................312
Complex Math ..............................................................................................................313
Types ...............................................................................................................................315
Strings ............................................................................................................................318
Regular Expressions ....................................................................................................319
Patterns ...................................................................................................................320
Special Sequence Characters ..............................................................................323
CONTENTS
Q Q Q
Compiling Regular Expressions .........................................................................323
Matching Strings ...................................................................................................324
Meta Characters ....................................................................................................326
Grouping .................................................................................................................327
System ............................................................................................................................328
Random Number Generation ....................................................................................330
Dates and Times ...........................................................................................................331
Creating a New Time ............................................................................................332
Time Operations ....................................................................................................332
Creating a New Date .............................................................................................333
Date Operations ....................................................................................................333
Time Zone Information ........................................................................................335
Operating System Interface .......................................................................................336
System Information ..............................................................................................336
Process Management ...........................................................................................337
In Conclusion ................................................................................................................341
CHAPTER 12
The GUI — TkInter ...............................................................................343
What Is TkInter? ...........................................................................................................343
Terms and Conditions .................................................................................................343
Event Handling ......................................................................................................344
Callbacks .................................................................................................................344
Widgets ....................................................................................................................345
Layout Managers ...................................................................................................345
Working with TkInter .................................................................................................346
Creating a Label ...........................................................................................................347
Frame Widgets and Centering ..................................................................................349
An Application with a Button ...................................................................................351
Working with Entry Fields and Grid Layouts ........................................................353
Creating a Class to Handle User Interfaces ...........................................................356
Working with List Boxes ............................................................................................358
Scrolling a List Box ................................................................................................361
CONTENTS
Q Q Q
Menus .............................................................................................................................363
Context Menus .............................................................................................................366
Scale Widgets ................................................................................................................367
RadioButtons and CheckButton ...............................................................................370
Text Widgets .................................................................................................................373
In Conclusion ................................................................................................................375
CHAPTER 13
The Web Server—Apache ...................................................................377
Setting Up Apache .......................................................................................................377
Testing Apache .............................................................................................................378
Your First Python CGI Script: Hello Apache ...........................................................379
Examining the Hello Python Script ...................................................................380
The cgi-bin Directory ............................................................................................381
A Script for Displaying the Environment ...............................................................382
Receiving Data from an HTML File ..........................................................................384
Sending Data to an HTML File ..................................................................................387
How It All Works ...................................................................................................390
Dynamic HTML Displays Based on User Input ......................................................391
HTML Elements ............................................................................................................396
Cookies ...........................................................................................................................399
Uploading Files ............................................................................................................402
Redirection ....................................................................................................................403
Error Handling ..............................................................................................................405
In Conclusion ................................................................................................................406
CHAPTER 14
Working with Databases ...................................................................407
What Is a Database? ...................................................................................................407
Simple Database Terminology ...........................................................................408
What Is MySQL? ...........................................................................................................409
Downloading and Installing ......................................................................................409
Creating a New Database ..........................................................................................410
Creating a New User ....................................................................................................414
CONTENTS
Q Q Q
Opening an Existing Database .................................................................................415
Writing to a Database ................................................................................................417
Reading from a Database ..........................................................................................421
Updating a Database ..................................................................................................424
Deleting from a Database ..........................................................................................427
Searching a Database .................................................................................................430
In Conclusion ................................................................................................................436
CHAPTER 15
Putting It All Together .......................................................................437
Designing the Application .........................................................................................437
Program Flow .........................................................................................................437
User Interface Design ...........................................................................................438
Database Design ...................................................................................................439
Implementing the Database Tables ........................................................................440
Implementing the Forms ...........................................................................................442
Adding Reviews ............................................................................................................449
Adding the Review to the Database ........................................................................452
Listing the Reviews ......................................................................................................456
Deleting Books .............................................................................................................459
In Conclusion ................................................................................................................462
CHAPTER 16
Python and Graphics ..........................................................................463
The PIL Library ..............................................................................................................463
Downloading ..........................................................................................................464
Installing .................................................................................................................464
Verifying Your Installation ..................................................................................465
Creating a New Image ................................................................................................465
Function Parameters ............................................................................................466
Drawing on the Image ................................................................................................467
Drawing the Image ...............................................................................................468
Displaying the Image ...........................................................................................470
CONTENTS
Q Q Q
schedule.run_pending()
File "D:\Temp\anaconda\lib\site-packages\schedule\__init__.py", line 625, in do
self.job_func = functools.partial(job_fu
直接切入正题。
我在使用_thread.start_new_thread(func(), ())时,报错:TypeError: first arg must be callable。
由于传入的function名带了括号,相当于在此处调用这个方法。所以这个参数本来应该是方法名,却成了该方法的返回值。
解决办法:
去掉方法后的括号:_thread.start_new_thread(f...
以下位转载博客
我在使用_thread.start_new_thread(func(), ())时,报错:TypeError: first arg must be callable。
由于传入的function名带了括号,相当于在此处调用这个方法。所以这个参数本来应该是方法名,却成了该方法的返回值。
解决办法:
去掉方法后的括号:_thread.start_new_thread(func
len = dataSet.__len__()
trainingSet.extend(dataSet[:len * 3 / 4])
testSet.extend(dataSet[len * 3 / 4:])
print len(trainingSet)
print len(test
1.read([size]): 读取文件(读取size个字节,默认读取全部)
2.readline([size]): 读取一行
3.readlines([size]): 读取完文件,返回每一行所组成的列表
文件写入方式:
write(str): 将字符串写入文件
writelines(sequence_of_strings): 写入文件
- 是一个高阶函数,它的第一个参数是函数,第二个参数是序列对象
- 传给filter函数的函数(第一个参数),它接受一个参数,执行的结果必须为True或False
- 序列对象中每一个元素分别作为函数的参数,计算结果为True则保留,为False舍弃
from random import randint
# def func1(x):
# r...