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>>> help(str.replace) Help on method_descriptor: replace(...)     S.replace(old, new[, count]) -> string          Return a copy of string S with all occurrences of substring     old replaced by new.  If the optional argument count is     given, only the first count occurrences are replaced. >>> s='hello python,hello world,hello c++,hello java!' >>> s.replace('hello','Hello')#将字符串s中的所有'hello'子串，替换成'Hello',返回替换后的字符串，原字符串s不变 'Hello python,Hello world,Hello c++,Hello java!' >>> s 'hello python,hello world,hello c++,hello java!' >>> s.replace('hello','Hello',2)#将字符串s中的前2个'hello'子串，替换成'Hello' 'Hello python,Hello world,hello c++,hello java!' >>> s 'hello python,hello world,hello c++,hello java!' >>> s.replace('wahaha','haha')#要替换的'wahaha'子串不存在，直接返回原字符串 'hello python,hello world,hello c++,hello java!'

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