A summary of several ways to concatenate python strings

This article to share the content is about the Python string connection of several ways to summarize, the need for friends to refer to

Python has a lot of string connections, today in writing code, by the way, from the most original string connection to string list connection, we feel the next

There are many string connections in Python, and today you write the code, and by the way, summarize:

The most primitive way to connect strings: Str1 + str2
Python new string connection syntax: STR1, STR2
Strange string Way: str1 str2
% connection string: ' name:%s; Sex: '% (' tom ', ' Male ')
String List connection: Str.join (some_list)

First, presumably as long as the programmer has the experience of the people, it is estimated that the direct use of "+" to connect two strings:

' Jim ' + ' Green ' = ' jimgreen '

The second is special, if two strings are separated by "comma", then the two strings will be concatenated, but there will be a space between the strings:

' Jim ', ' green ' = ' Jim Green '

The third is also Python-specific, as long as the two strings together, the middle of a blank or no blank: two strings are automatically connected to a string:

' Jim ' Green ' = ' jimgreen '
' Jim ' Green ' = ' jimgreen '

The fourth function is more powerful, drawing on the function of the printf function in C, if you have a C language basis, look at the document to know. In this way, a string and a set of variables are concatenated with the symbol "%", and the special tags in the string are automatically replaced with the variables in the right variable group:

'%s ',%s '% (' Jim ', ' green ') = ' jim, green '

The fifth type is the technique, using the string function join. This function takes a list and then connects each element of the list with a string:

Var_list = [' Tom ', ' David ', ' John ']
A = ' # # # '
A.join (var_list) = ' tom## #david # # #john '

In fact, Python also has a way of string connection, but not much, is the string multiplication, such as:

A = ' abc '
A * 3 = ' abcabcabc '