python - Pandas - Modify string values in each cell -


i have panda dataframe , need modify values in given column. each column contains string value of same length. user provides index want replaced each value: ex: [1:3] , replacement value "aaa".

this replace string values 1 3 value aaa.

how can use applymap, map or apply function done?

thanks

here final solution went off of using answer marked below:

import pandas pd  df = pd.dataframe({'a':['ffgghh','ffrtss','ffrtds'],                      #'b':['ffrtss','ssgghh','d'],                      'c':['qqttss',' 44','f']}) print df old = ['g', 'r', 'z'] new = ['y', 'b', 'c'] vals = dict(zip(old, new))  pos = 2 old, new in vals.items():     df.ix[df['a'].str[pos] == old, 'a'] = df['a'].str.slice_replace(pos,pos + len(new),new) print df

use str.slice_replace:

df['b'] = df['b'].str.slice_replace(1, 3, 'aaa')

sample input:

           b 0  w   abcdefg 1  x   bbbbbbb 2  y   ccccccc 3  z  zzzzzzzz

sample output:

            b 0  w   aaaadefg 1  x   baaabbbb 2  y   caaacccc 3  z  zaaazzzzz

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