def bad(string): bad_input = string.find('bad') if bad_input == -1: return string not_input = string.find('not') if not_input == -1: return string if bad_input < not_input: return string s1 = string[:not_input - 1] s2 = string[bad_input + 4:] elif len(s2) == 0: return s1 + ' good' + s2 elif len(s1) == 0: return 'good ' + s2 else: return s1 + ' good ' + s2 print(bad('This is not bad.')) assert bad('a') == 'a' assert bad('bad') == 'bad' assert bad('not') == 'not' assert bad('bad and not') == 'bad and not' print(bad('This is not so bad')) assert bad('This is not so bad') == 'This is good' assert bad('This is not hihihihihihihihihi bad') == 'This is good' print bad('This is not so bad and this is good') assert bad('This is not so bad and this is good') == 'This is good and this is good' print bad('Not bad') assert bad('Not bad') == 'good'
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