"Python" format string and Format function

# # This article is based on Python3, there may be partial content not fit Python2

1. Output of the simplest string:

' popma is so cool ' Print (STR1)

Output:

 is so cool

2. '%s ' formatted string output:

When formatting a string, there is a format character in the string, and the string becomes a template;

For example:

' %s is so cool ' %'popma'print(str2)

The output is the same as above, you can try it.

But if there are multiple format characters, how do you handle them? PytHon with a tuple ( tuples, which may not be easy to understand if the Python data structure has not been learned), passes multiple values to the template, corresponding to the format character one by one.

For example:

' %s is%d ' % ('popma', ')print(STR3)

Where '%d ' represents the number, and this is the same as in C.

3. The Format function

3.1. By location Mapping:

Give examples:

' {0} is {1}, and he is a {2}------{0}'. Format ('popma', '  boy')
out:'popma is, he's a boy------popma'

There is another one that does not write 0 and 1:

' {} is ' {}, and he is a {} '. Format (' Popma ', ' I ', ' Boy ') out: ' POPMA is, he's a boy '

3.2. Through a dictionary-like mapping:

' I am {name}, I am {age} '. Format (name='popma', age=20) out:'I am POPMA, I Am+'

"Python" format string and Format function