python - 在python中修改字符串

Question

我在python中有一个字符串

 name="My name is John"

我想将名称替换为：

 name ="My name is JohnSmith"

谁能帮忙？？

Answer 1

你不能在 python 中修改一个字符串，因为它们是不可变的，所以修改一个字符串总是会产生一个新的字符串。

对于您的示例，您可以使用：

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：

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

对于连接许多项目的列表，首选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")