format to format the output in Python, more powerful tool output

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What is the format to format the output?

The basic format output with respect to the use of "%" method, format powerful, which function as a template string, formatted parameters passed, and braces "{}" instead of as a special character "% ", which is somewhat similar to C # placeholder

formatted output format

Basic usage 1) format of

• Not numbered, i.e., "{}"
• Numbered, the order may be reversed, i.e., "{1}", "{2}"
• With the keyword, i.e., "{a}", "{tom}"

Such as:

The basic format of usage

2) format Advanced use

• <(Default) Left,> right alignment, center alignment ^
• Bits take "{: 4s}", "{:. 2f}", etc.

Such as:

![(https://upload-images.jianshu.io/upload_images/18829896-e746d3f5f6c62300?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

Advanced use format

3) format usage value

• "B" binary radix number to two outputs
• "C" character, before printing the integer conversion to the corresponding unicode string
• "D" decimal number, and outputs a digital base 10
• "O" octal, base 8 digital outputs
• "X" hexadecimal number, the digital output base 16, represented by the above 9 af
• "E" the power notation, the digital printing scientific notation. With "e" represents power
• "G" general format, the digital output to fixed-point, when the value particularly when the power in the form of print
• "N" number, when the value of the integer and "d" the same, a floating point value and "g" the same, except that he will insert digital Separator according to locale.
• "%" Percentage value is multiplied by 100 to print, retention six decimal places, the value will be behind a percent sign
• "," Thousand separators, large data value or currency often used

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Such as: