python - pandas vectorized string replace by index -

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trying change first 2 characters in pandas column string.

def shift(x): x=list(x) x[0] = '1' x[1] = '9' print x  #this prints correct result list ##str(x) return ''.join(x)  ## works mc_data['timeshift'] = mc_data['realtime'].map(lambda x: shift(x) )

output nonetype

i tried, str.slice_replace.map(lambda x: '19').

how do this?

instead of replacing first 2 characters, build new strings:

>>> df = pd.dataframe({"a": ['abcd']*4}) >>> df       0  abcd 1  abcd 2  abcd 3  abcd >>> df["a"] = "19" + df["a"].str[2:] >>> df       0  19cd 1  19cd 2  19cd 3  19cd

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