freeCodeCamp/guide/chinese/python/string-methods/string-replace-method/index.md

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String Replace Method	字符串替换方法

字符串替换方法

str.replace(old, new, max)方法用于将字符串old替换为字符串new ，总计max次数。此方法返回带有替换的字符串的新副本。原始字符串str保持不变。

例子

1. 用"WAS"替换所有出现的"is" "WAS"

string = "This is nice. This is good." 
 newString = string.replace("is","WAS") 
 print(newString) 

产量

ThWAS WAS nice. ThWAS WAS good. 

2. 用"WAS"替换前两次出现的"is" "WAS"

string = "This is nice. This is good." 
 newString = string.replace("is","WAS", 2) 
 print(newString) 

产量

ThWAS WAS nice. This is good. 

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