How to add elements to a string in python

The string object in Python cannot be changed, that is, it is not possible to directly modify one or more characters in the string. That is, the string object in Python cannot be changed, but the reference of the string object can Changed to repoint to a new string object.

Direct elements outside the string (recommended learning: Python video tutorial)

name = 'zheng'
print('my name is '+name)

% Direct string outside % (element)

A string formatting syntax. The basic usage is to insert the value into the string of the %s placeholder.

%s, means formatting an object as characters

name = 'zhang'
age = '25'
print('my name is %s'%(name)+' my age is %d'%(age))

format() function

When more elements are to be inserted

name = input('请输入你的名字：')
    data = input('请输入发送内容：')
    dest_ip = input('请输入ip：')
    dest_port = 2425
    chat_socket.sendto('1:123456:发送者的名称:{my_name}:32:{my_data}'.format(my_name=name,my_data=data).encode('gbk'),(dest_ip,dest_port))

Format() directly, and slowly assign values ​​to it later

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