Introducing several common methods of string concatenation in python

There are many

string connection methods in python. I am writing code today. Let me summarize by the way:

The most original string connection method: str1 + str2
Python new string connection syntax: str1, str2
Strange string method: str1 str2

% Connection string: 'name:%s; sex: ' % ('tom', 'male')
String list connection: str.join(some_list)

The first method, as long as anyone with programming experience probably knows, directly use "+" to connect two String:

'Jim' + 'Green' = 'JimGreen'

The second one is special. If two strings are separated by "comma", then the two strings will be concatenated, but there will be an extra space between the strings:

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

The third type is also unique to python. Just put two strings together, with or without blanks in between: the two strings are automatically concatenated into one string:

'Jim''Green' = 'JimGreen'
'Jim' 'Green' = 'JimGreen'

The fourth function is relatively powerful and draws on the functions of the printf function in C language. If you have a C language foundation, just read the documentation. In this way, the symbol "%" is used to connect a string and a group of variables. The special marks in the string will be automatically replaced with the variables in the variable group on the right:

'%s, %s' % ('Jim', 'Green') = 'Jim, Green'

The fifth method is a skill. Use the string function join. This function accepts a list, and then uses a string to connect each element in the list in turn:

var_list = ['tom', 'david', 'john']
a = '###'
a.join(var_list) = 'tom###david###john'

In fact, there is another string connection method in Python, but it is not used much, which is string multiplication, such as:

a = 'abc'
a * 3 = 'abcabcabc'

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