python - Renaming a column in a df without the need of stating the old name -

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i have following df: 

                24/08/2017  tests:  ch4                10  h20                 9  nh4                 4  c02                 1  so4                 1

how rename unique column name without need of stating old name?

the common method know requires state old name of column such as: 

df = df.rename(columns={'old_name': 'new_name'}

how rename column name without need of stating old name ?





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