Python 数字的格式化输出

>>> x = 1234.56789

>>> # Two decimal places of accuracy
>>> format(x, '0.2f')
'1234.57'

>>> # Right justified in 10 chars, one-digit accuracy
>>> format(x, '>10.1f')
'    1234.6'

>>> # Left justified
>>> format(x, '<10.1f')
'1234.6    '

>>> # Centered
>>> format(x, '^10.1f')
'  1234.6  '

>>> # Inclusion of thousands separator
>>> format(x, ',')
'1,234.56789'
>>> format(x, '0,.1f')
'1,234.6'
>>>

>>> format(x, 'e')
'1.234568e+03'
>>> format(x, '0.2E')
'1.23E+03'
>>>

>>> 'The value is {:0,.2f}'.format(x)
'The value is 1,234.57'
>>>

>>> x
1234.56789
>>> format(x, '0.1f')
'1234.6'
>>> format(-x, '0.1f')
'-1234.6'
>>>

>>> swap_separators = { ord('.'):',', ord(','):'.' }
>>> format(x, ',').translate(swap_separators)
'1.234,56789'
>>>

>>> '%0.2f' % x
'1234.57'
>>> '%10.1f' % x
'    1234.6'
>>> '%-10.1f' % x
'1234.6    '
>>>