Introduction to three methods of Python string concatenation and formatted output

The content of this article is an introduction to three methods of formatted output of Python string splicing. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The formatted output of string splicing is to edit the content that needs to be output, assign it to a variable, and finally output it to the screen.
Method 1

name = input('your name:')
age = int(input('your age:'))    # int() str转int。
job = input('your job:')

info = '''
---------- info of %s ---------    
Name : %s    
Age : %d
Job : %s
''' % (name,name,age,job)    # 此处 % 为连接符，把变量的值连接起来，顺序不能颠倒。

print(info)

Placeholder
%s s=string, universal, error-free, Python outputs a string by default.
%d d=digit, integer type.
%f f=float, decimal, 6 decimal places are saved by default. The value of the 6th decimal place is based on the 7th decimal place and will be rounded off.
%.3f, specify to save 3 decimal places.

Method Two

name = input('your name:')
age = int(input('your age:'))    # int() str转int。
job = input('your job:')

info = '''
---------- info of {_name} ---------
Name : {_name}
Age : {_age}
Job : {_job}
''' .format(_name=name,_age=age,_job=job)

print(info)

Method Three

name = input('your name:')
age = int(input('your age:'))    # int() str转int。
job = input('your job:')

info = '''
---------- info of {0} ---------
Name : {0}
Age : {1}
Job : {2}
''' .format(name,age,job)

print(info)

For string concatenation formatted output, it is recommended to use method 2 and method 3. There is also a plus sign connection method for splicing output, which is not recommended. Each additional plus sign will occupy some memory space and the execution efficiency is low.

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