pandas drop all columns except certain ones
df.drop(df.columns.difference(['a','b']), 1, inplace=True)
pandas drop all columns except certain ones
df.drop(df.columns.difference(['a','b']), 1, inplace=True)
pandas see all columns
pd.set_option('display.max_columns', None)
pd.set_option('display.max_rows', None)
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