>>> "{key}={value}".format(key="a", value=10) # 使⽤命名参数
'a=10'
>>> "[{0:<10}], [{0:^10}], [{0:*>10}]".format("a") # 左中右对⻬
'[a ], [ a ], [*********a]'
>>> "{0.platform}".format(sys) # 成员
'win32'
>>> "{0[a]}".format(dict(a=1, b=2)) # 字典
'1'
>>> "{0[3]}".format(range(10)) # 列表
'5'
>>> "My name is {0} :-{{}}".format('Mongo') # 真得想显示{},需要双{}
'My name is Mongo :-{}'
>>> "{0!r:20}".format("Hello")
"'Hello' "
>>> "{0!s:20}".format("Hello")
'Hello '
>>> "Today is: {0:%a %b %d %H:%M:%S %Y}".format(datetime.today())
'Today is: Sun Mar 05 18:35:22 2017'
