python字符串格式化什么意思

>>> li = ['hoho',18]

>>> 'my name is {} ,age {}'.format('hoho',18)

'my name is hoho ,age 18'

>>> 'my name is {1} ,age {0}'.format(10,'hoho')

'my name is hoho ,age 10'

>>> 'my name is {1} ,age {0} {1}'.format(10,'hoho')

'my name is hoho ,age 10 hoho'

>>> 'my name is {} ,age {}'.format(*li)

'my name is hoho ,age 18'

>>> hash = {'name':'hoho','age':18}

>>> 'my name is {name},age is {age}'.format(name='hoho',age=19)

'my name is hoho,age is 19'

>>> 'my name is {name},age is {age}'.format(**hash)

'my name is hoho,age is 18'

>>> '{0:*>10}'.format(10)  ##右对齐

'********10'

>>> '{0:*<10}'.format(10)  ##左对齐

'10********'

>>> '{0:*^10}'.format(10)  ##居中对齐

'****10****'

>>> '{0:.2f}'.format(1/3)

'0.33'

>>> '{0:b}'.format(10)    #二进制

'1010'

>>> '{0:o}'.format(10)     #八进制

'12'

>>> '{0:x}'.format(10)     #16进制

'a'

>>> '{:,}'.format(12369132698)  #千分位格式化

'12,369,132,698'

>>> li

['hoho', 18]

>>> 'name is {0[0]} age is {0[1]}'.format(li)

'name is hoho age is 18