如2。X，使用str.replace()。

例子:

>>> 'Hello world'.replace('world', 'Guido')
'Hello Guido'

供您参考，当将某些字符附加到字符串中任意位置固定的单词后(例如，通过添加后缀-ly将形容词更改为副词)，您可以将后缀放在行尾以提高可读性。要做到这一点，在replace()中使用split():

s="The dog is large small"
ss=s.replace(s.split()[3],s.split()[3]+'ly')
ss
'The dog is largely small'

试试这个:

mystring = "This Is A String"
print(mystring.replace("String","Text"))

如2。X，使用str.replace()。

例子:

>>> 'Hello world'.replace('world', 'Guido')
'Hello Guido'

python 3中的replace()方法被简单地用于:

a = "This is the island of istanbul"
print (a.replace("is" , "was" , 3))

#3 is the maximum replacement that can be done in the string#

>>> Thwas was the wasland of istanbul

# Last substring 'is' in istanbul is not replaced by was because maximum of 3 has already been reached

Python 3的str.replace的官方文档

Python 3的str.replace

Str.replace (old, new[， count]) 返回字符串的副本，所有出现的子字符串old都替换为new。如果给出了可选参数count，则只替换第一次出现的计数。

对应的VSCode的语法注意如下:

str.replace(self: str, old, new, count) -> str.replace(self: str, old, new, count

两种方法使用str.replace

方法1:使用内置str的replace -> str.replace(strVariable, old, new[， count])

replacedStr1 = str.replace(originStr, "from", "to")

方法二:使用str变量的replace -> strVariable。替换(old, new[， count])

replacedStr2 = originStr.replace("from", "to")

完整的演示

代码:

originStr = "Hello world"

# Use case 1: use builtin str's replace -> str.replace(strVariable, old, new[, count])
replacedStr1 = str.replace(originStr, "world", "Crifan Li")
print("case 1: %s -> %s" % (originStr, replacedStr1))

# Use case 2: use str variable's replace -> strVariable.replace(old, new[, count])
replacedStr2 = originStr.replace("world", "Crifan Li")
print("case 2: %s -> %s" % (originStr, replacedStr2))

输出:

case 1: Hello world -> Hello Crifan Li
case 2: Hello world -> Hello Crifan Li

截图:

My related (Chinese) post: str.replace String in Python 3