修改蟒蛇

Question

字符串我有蟒蛇

name="My name is John" 

我要替換名稱的字符串：

name ="My name is JohnSmith" 

誰能幫助？

Answer 1

您不能在python中修改字符串，因爲它們是不可變的，所以修改字符串總是會生成一個新字符串。

爲了您的例子，你可以使用：

字符串連接：

>>> 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' 

對於中將許多項的列表喜歡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")