Python格式化输出字符串方法小结【%与format】

>>> print("{:,}".format(123456))#输出1234,56
123,456
>>> print("{a:w^8}".format(a="8"))#输出www8wwww,填充w
www8wwww
>>> print("%.5f" %5)#输出5.000000
5.00000
>>> print("%-7s3" %("python"))#输出python 3
python 3
>>> print("%.3e" %2016)#输出2.016e+03,也可以写大E
2.016e+03
>>> print("%d %s" %(123456,"jb51"))#输出123456 jb51
123456 jb51
>>> print("%(what)s is %(year)d" % {"what":"this year","year":2016})#输出this year is 2016
this year is 2016
>>> print("{0}{1}".format("hello","fun"))#输出hellofun,这与CSharp的格式化字符(占位符)相似
hellofun
>>> print("{}{}{}".format("jb51",".","net"))#输出jb51.net
jb51.net
>>> print("{a[0]}{a[1]}{a[2]}".format(a=["jb51",".","net"]))#输出jb51.net
jb51.net
>>> print("{dict[host]}{dict[dot]}{dict[domain]}".format(dict={"host":"www","domain":"jb51.net","dot":"."}))#输出www.jb51.net
www.jb51.net
>>> print("{a}{b}".format(a="python",b="3"))#输出python3
python3
>>> print("{who} {doing} {0}".format("python",doing="like",who="I"))#输出I like python
I like python
>>>