A common text manipulation is to locate a substring and replace its value. Method replace takes two substrings. It searches a string for the substring in its first argument and replaces each occurrence with the substring in its second argument. The method returns a new string containing the results. Let’s replace tab characters with commas:

In [1]: values = '1	2	3	4	5'

In [2]: values.replace('	', ',')
Out[2]: '1,2,3,4,5'

Method replace can receive an optional third argument specifying the maximum number of replacements to perform.