python如何replace(替换)多个字符？

#!/usr/bin/python

str = "this is string example....wow!!! this is really string";

print str.replace("is", "was");

print str.replace("is", "was", 3);

//定义一个数组

let str = [[1],[2],[3],[4]];

//先转换成JSON字符串

let str2 = JSON.stringify(str);

//在对该字符串进行字符替换,在这里我们将所有中括号都替换成空

console.log(str2.replace(/\[|]/g,''));

//这样就完成了多个字符的替换