python中格式化format

1、

format位置参数

>>> "{0},{1},{2}".format("aaa","bbb","ccc")
'aaa,bbb,ccc'
>>> "{2},{1},{0}".format("aaa","bbb","ccc")
'ccc,bbb,aaa'
>>> "{0},{2},{1}".format("aaa","bbb","ccc")
'aaa,ccc,bbb'

format关键字参数

>>> "{a},{b},{c}".format(a = "aaa",b = "bbb",c = "ccc")
'aaa,bbb,ccc'
>>> "{a},{b},{c}".format(a = "mmm",b = "nnn",c = "aaa")
'mmm,nnn,aaa'

位置参数和关键字参数：

>>> "{0},{x},{y}".format("mmm",x = "0000",y = "1111")
'mmm,0000,1111'

>>> "{0},{1:.2f}".format("test",83.23214231)
'test,83.23'