How to use 'pandas columns to list' in Python

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147def __to_list(self, column_or_columns):
148 column_names = column_or_columns
149 if not isinstance(column_names, (list, tuple)):
150 column_names = [column_names]
151 return column_names
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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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