How to use 'pandas swap columns' in Python

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188def swap_columns(i,j,*args):
189 """
190 Swaps ith and jth column of each matrix in args
191 Returns a list of new matrices
193 Parameters
194 ----------
195 i : int
196 j : int
197 M : np.array
198 args : np.arrays
200 Returns
201 -------
202 list
203 list of np.arrays, copies of args with ith and jth column
204 swapped
205 """
206 output = list()
207 for M in args:
208 output.append(_cswap(i,j,M))
209 return output

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39def _drop_col(self, df):
40 '''
41 Drops last column, which was added in the parsing procedure due to a
42 trailing white space for each sample in the text file
43 Arguments:
44 df: pandas dataframe
45 Return:
46 df: original df with last column dropped
47 '''
48 return df.drop(df.columns[-1], axis=1)

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