Python字符串格式化专题

1、百分号

str = “I am %s” % “CHQ”

str = “I am %s, age %d, score %.2f” % (CHQ, 18, 19.22254)

str = “I am %(name)s, age %(age)d” % {"name":"alex", "age": 18}

 

2、format(self, *args, **kwargs)

"I am {name}， {age}".format(name='Chen.H.Q'， age=19)

"I am {name}， {age}".format(**{'name':'Chen.H.Q'， "age":19})

"I am {0}， {1}".format('Chen.H.Q', 19)

 

 

3、format_map(self, mapping) //将占位符格式化

eg:n = "I am {name}， {age}"

maping = {"name": 'ChenHaiquan', "age": 19}

v = n.format_map(maping) //I am ChenHaiquan， 19

 

 

4、 maketrans(self, *args, **kwargs) // 建立字符串映射表

eg1: n = "123456";

m = "abcdef";

l = str.maketrans(n, m)

v = "vvvv1vvvvv2vv3vv4vv5vv3vv4vv5vv6"

v = v.translate(l); //vvvvavvvvvbvvcvvdvvevvcvvdvvevvf

 

eg2:pp = {"1": "a", "2":"b", "3":"c"}

xx = n.maketrans(pp)

v = "vvvv1vvvvv2vv3vv4vv5vv3vv4vv5vv6"

v = v.translate(xx); //vvvvavvvvvbvvcvv4vv5vvcvv4vv5vv6