Detailed format function Python--

Foreword

• string format for formatting function

usage

• The basic syntax of symbolic representations of operations by {},
• And each sequence can be set {},
• Respectively correspond to the order of format parameters,
• If no subscript {}, 0 default weight increments.

By location

print('{0} {1}'.format('hello','world')) # 通过位置
print('{1} {0}'.format('hello','world'))

By Keyword

print('{人物}今天{事件}'.format(人物='我',事件='写博客'))#通过关键字
job = {'person':'你','affair':'写博客'}
# 可用字典当关键字传入值时，在字典前加**即可
print('{person}昨天{affair}'.format(**job))

Filling aligned

^ < > Denote centered, left justified, right justified, the width of the back

print('{:^18}'.format('hello'))
print('{:>18}'.format('hello'))
print('{:<18}'.format('hello'))
print('{:*<18}'.format('hello'))
print('{:&>18}'.format('hello'))

Accuracy and type f

print('{:.1f}'.format(3.1415926))
print('{:.3f}'.format(3.1))

Decimal conversion

symbol	description
b	Binary
O	Octal
d	Decimal
x	Hex

print('{:b}'.format(777))
print('{:o}'.format(777))
print('{:d}'.format(777))
print('{:x}'.format(777))

Thousands Separator

• Usually used as money

print('{:,}'.format(100000000))
print('{:,}'.format(12345.6789))