How python outputs the strings you need and how to connect them

The most originalStringConnection method: str1 + str2

python New string concatenation syntax: str1, str2
Strange string method: str1 str2
% Concatenation string: 'name:%s; sex:%s ' % ('tom', 'male')
String list connection: str.join(some_list)

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

>>> print('jim'+'green')
jimgreen

The second type is special, if two strings use "comma" separated, then the two strings will be concatenated, but there will be an extra space between the strings:

>>> print('jim',' green')
jim greem

The third type is also unique to python. Just put two strings together, with or without blanks in between: two strings Automatically connected to a string:

>>> print('jim''green')
jimgreen

The fourth function is more powerful and draws on the function of the printf function in C language. If you have a foundation in C language, just read the documentation. This method uses the symbol "%" 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:

>> ;> print('%s,%s'%('jim','green'))
jim,green

The fifth type is a skill, use String function join. This function accepts a list and then concatenates each element in the list with a string:

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

john

In fact, python There is also a string connection method in , but it is not used much, which is string multiplication, such as:
a = 'abc'
>>> print(a*3)

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