python 2.7 - How to double a char in a string? -


i trying write function takes 2 arguments, string , letter. function should double number of letter in string. example:

double_letters("happy", "p") happppy

what have done far;

def double_letter(strng, letter):  new_word = ""     char in strng:         if char == letter:             pos = strng.index(char)             new_word = letter+strng[pos:]

but giving me output: pppy

how can change function output: happppy?

use string.replace

string = 'happy' letter = 'p' string = string.replace(letter, letter + letter) print string

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