Python formatted string Format function

Read Mattkang's notes in CSDN's blog, "The flowing Python-enhanced formatted string format function"

Since python2.6, a new function Str.format () has been added to the format string, which replaces% with {} and:.

1. Map instances

IN[1]:'{0},{1}'. Format ('ABC', 18) out[1]:'abc,18'in[2]:'{}'. Format (18) out[2]: 18in[3]:'{1},{0},{1}'. Format ('ABC', 123) out[3]:'123,abc,123'in[4]:'{Name}, {age}'. Format (age=18, name ='ABC') out[4]:'ABC,'in[5]: p = ['ABC', 18]in[6]:'{0[0]}, {0[1]}'. Format (p) out[6]:'ABC,'

2. Format qualifier

It has a rich format qualifier (syntax is in {} with:), such as:

Fill and align:

Fill want to use it together

^, <, > is centered, left-aligned, right-aligned, followed by width

: The character after the fill, can only be one character, not specified by default with a space padding

Like what:

' {: >8} '. Format ('189') out['     189'in ['{: 0>8}'. Format ('189') out[  '00000189'

Accuracy and type

Accuracy is often used in conjunction with Type F

' {:. 2f} '. Format (321.3456) out['321.34'

Where. 2 represents a precision of 2 length, and F represents a float type.

Other types

Mainly binary, B, D, O, x binary, Decimal, octal, and hexadecimal, respectively

 in[10]:  {:b}   ' . Format (17) out[]:  " 10001    in[ all]:  '    

To use, the number can also be used to make the amount of thousands separator

' {:,} '. Format (1234567890) out['1,234,567,890'

Python formatted string Format function