Detailed introduction to format() format output in Python (with code)

This article brings you a detailed introduction to format() format output in Python (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Formatted output: format()

format(): Replace the traditional % with {} to achieve formatted output

1. Use positional parameters: that is, In the string, replace the variable value that needs to be output with {}, and then use format() to modify it to become the desired string. The positional parameter is to change the traditional % to {}, and automatically replace it according to the positional order.

'My name is {},age:{}'.format('Anxc',18)
'My name is Anxc,age:18'

2. Use positional parameters: On the original basis, the replacement value is changed according to the position by changing the position (I feel it is useless, not as useful as the first one)

'My name is {1},age:{0}'.format(18,'Anxc')
'My name is Anxc,age:18'

3. Character padding (left-aligned, right-aligned, center-aligned)

'右对齐{:#>10}'.format(10)
'右对齐########10'

4. Use keyword parameters: use key=value to achieve one-to-one assignment replacement

'My name is{name},age:{age}'.format(name='Anxc',age=18)
'My name isAnxc,age:18'

5. Precision output of numbers: It feels like the float type output of C language. (Format: {:. #binary

>>> '{:.4f}'.format(1/3)
'0.3333'
>>> '{:4f}'.format(100)
'100.000000'#目前没有发现整数是啥用处

>>> '{:,}'.format(19012390123)
'19,012,390,123'

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'18的二进制：{:b}'.format(18)
'18的二进制：10010'
>>> '18的八进制：{:o}'.format(18)
'18的八进制：22'
>>> '18的十六进制：{:x}'.format(18)
'18的十六进制：12'