Python2.6 開始，新增了一種格式化字串的函式 str.format()。使用起來簡單方便，不會遇到使用%時候格式的選擇問題。

按照引數預設順序

>>> "yesday is {}, today is {}".format("saturday", "sunday")
'yesday is saturday, today is sunday'
>>>

指定引數順序

>>> "yesday is {0}, today is {1}, good day is {0}".format("saturday", "sunday")
'yesday is saturday, today is sunday, good day is saturday'
>>>
 

指定引數名稱

#!/usr/bin/python

s = "I am a {name}, and study {subject}".format(name="coder", subject="ES")
print s

output:

I am a coder, and study ES

使用字典做引數

# dict
d = {"name": "coder", "subject": "VUE"}
s = "I am a {name}, and study {subject}".format(**d)
print s

output:

I am a coder, and study VUE

使用列表做引數

# list
l = ["coder", "big data"]
s = "I am a {0}, and study {1}".format(*l)
print s

output:

I am a coder, and study big data

使用物件做引數

class Orange(object):
        def __init__(self, v):
                self.value = v


orge = Orange(5)
s = "The PH of an orange  is {.value}".format(orge)
print (s)
 

output:

The PH of an orange is 5