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- def helper(got,expect):
- if got == expect: print True
- else: print False, expect, got
- print "\nstr.replace"
- helper('hello'.replace('l','L'),'heLLo')
- helper('hello'.replace('l','L',1),'heLlo')
- helper('hello'.replace('l','L',5),'heLLo')
- helper('hello'.replace('l','L',0),'hello')
- helper('hello hello hello'.replace('ll','lll'),'helllo helllo helllo')
- helper('hello hello hello'.replace('ll','lll',2),'helllo helllo hello')
- helper('hello hello hello'.replace('ll','l'),'helo helo helo')
- helper('hello hello hello'.replace('ll','l',2),'helo helo hello')
- helper('abcabcaaaabc'.replace('abc','123'),'123123aaa123')
- helper('abcabcaaaabc'.replace('abc','123',2),'123123aaaabc')
- helper('abcabcaaaabc'.replace('abc','123',-1),'123123aaa123')
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