修改蟒蛇

Question

字符串我有蟒蛇

name="My name is John" 

我要替换名称的字符串：

name ="My name is JohnSmith" 

谁能帮助？

Answer 1

您不能在python中修改字符串，因为它们是不可变的，所以修改字符串总是会生成一个新字符串。

为了您的例子，你可以使用：

字符串连接：

>>> name = "My name is John" 
>>> name += "Smith"  #equivalent to name = name + "Smith" 
>>> name 
'My name is JohnSmith' 

或字符串格式化：

>>> name = "My name is John" 
>>> name = "{0}{1}".format(name,"Smith") 
>>> name 
'My name is JohnSmith' 

对于中将许多项的列表喜欢str.join：

>>> name="My name is John" 
>>> name = "".join((name,"Smith","foo","bar","spam")) 
>>> name 
'My name is JohnSmithfoobarspam' 

Answer 2

>>> name[:11] + 'John Smith' 
'My name is John Smith' 

Answer 3

str = "My name is John" 
str = str.replace("John","JohnSmith")