replace函数字符串处理函数语法str.replace(old,new[,max])old需要进行更换的旧子串new新的子串将取代旧的子字符串子串可以为空max如果可选参数max值给出表示出现前max的次数的子串被替换strmonkey likes lion,wow!!!monkey likes lion very much!! print(str.replace(li,ha)) print(str.replace(li,ha,3)) print(str.replace(li,)) print(str)输出结果monkey likes lion,wow!!!monkey likes lion very much!!monkey hakes haon,wow!!!monkey hakes lion very much!!monkey kes on,wow!!!monkey kes on very much!!monkey likes lion,wow!!!monkey likes lion very much!!运行结果来看replace函数不会改变原始字符串的值如果需要使用替换后的字符串需要将其重新赋值给一个新的变量
