pandas vectorized string replace by index

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Trying to change the first two characters in a pandas column string.

def shift(x):
x=list(x)
x[0] = '1'
x[1] = '9'
print x  
str(x)

mc_data['timeshift'] = mc_data['realtime'].map(lambda x: shift(x) )

output is NoneType

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

How do I do this?

asked 14 mins ago

syntax

71