Python Questions: Write a function which is passed 3 parameters, all of which ar

Question

Python Questions:

Write a function which is passed 3 parameters, all of which are strings. The function returns a copy of the string s with all occurrences of old_c replaced by new_c. You are not allowed to use the built-in Python replace method. You may assume that old_c and new_c are both strings of length 1.

The solution must be recursive

For example:

>>> replace('science', 'c', 't')
'stiente'
>>> replace('python', 's', 't')
'python'
>>> replace('rocker', 'r', 'd')
'docked'

Explanation / Answer

def replace(word,char1,char2):
string = list(word)
result = []
for i in string:
if i == char1:
i = char2
result.append(i)
print ''.join(result)

replace('science','c','t')

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