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I have a function which will give me a dataframe olddataframe as output in a loop, i want to combine them into a single Dataframe as newdataframe by appending and i tried the below code

newdataframe=pd.DataFrame
newdataframe.append(olddataframe,ignore_index=False)
it throws an error like below
TypeError: append() missing 1 required positional argument: 'other'
what needs to be done to fix this
I suggest create list of DataFrames and then concat only once, if performance is important:
dfs = []
for olddataframe in data:
    #data processing 
    dfs.append(olddataframe)
newdataframe = pd.concat(dfs, ignore_index=False)