Python

df = df.add_prefix("prefix_")
df = df.add_suffix('_suffix')

df.columns = ['f_' + i if ix < 15 else i for ix, i in enumerate(df.columns)]

df.add_prefix('col_')

df.columns = ['f_' + i if ix < 15 else i for ix, i in enumerate(df.columns)]

df.columns = ['f_' + i if ix < 15 else i for ix, i in enumerate(df.columns)]

s.add_prefix('item_')

df.add_prefix('col_')

s.add_prefix('item_')
item_0    1
item_1    2
item_2    3
item_3    4
dtype: int64

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