format格式化
1 # 基本的格式化
2 top1 = "My name is {} and my English name is {}.I`m {} years old".format("liu","crab","33")
3
4 # 传入的是列表，列表前面必须加个星号
5 top2 = "My name is {} and my English name is {}.I`m {} years old".format(*["liu","crab","33"])
6
7 # 大括号里的数字是按照取元祖下标的方式进行标号，例如format后面的元祖只有3个，如果下标取到3以后的数字会报错
8 top3 = "My name is {0} and my English name is {1}.I`m {0} years old".format("liu","crab","33")
9
10 # 大括号里写入数字，后面也可以传入列表，列表前面必须加个星号，其他规则同top3
11 top4 = "My name is {0} and my English name is {1}.I`m {0} years old".format(*["liu","crab","33"])
12
13 # 常用的格式化
14 top5 = "My name is {name} ,I`m {age} years old".format(name = "liu",age = "33")
15
16 # 大括号里命名后，format后可传入字典，字典前面必须加2个星号，输出后是key对应的value值
17 top6 = "My name is {name} ,I`m {age} years old".format(**{"name":"crab","age":33})
18
19 # format里如果是多个列表并要从中取值，大括号里选取的方式和正常从列表中取值的方式相同。
20 top7 = "My name is {0[0]} and my English name is {1[0]}.I`m {1[1]} years old".format(["zhao","qian","sun","li"],["alex","haha","oo"],[12,13,14,15,16])
21
22 # 大括号里必须有冒号“ ：”，但是format后的值，必须和前面":s",":d",":f"对应，否则会报错。例如：如果我把中间的"33"换成字符串，那么就会报错
23 top8 = "My name is {:s} and my English name is {:d}.I`m {:f} years old".format("liu", 33, 2.23)
24
25 # 列表前要加星号，其他规则同top8,列表中的顺序也要和前面的一一对应，否则会报错
26 top9 = "My name is {:s} and my English name is {:s}.I`m {:d} years old".format(*["liu","crab",33])
top1的结果是： My name is liu and my English name is crab.I`m 33 years old
top2的结果是： My name is liu and my English name is crab.I`m 33 years old
top3的结果是： My name is liu and my English name is crab.I`m liu years old
top4的结果是： My name is liu and my English name is crab.I`m liu years old
top5的结果是： My name is liu ,I`m 33 years old
top6的结果是： My name is crab ,I`m 33 years old
top7的结果是： My name is zhao and my English name is alex.I`m haha years old
top8的结果是： My name is liu and my English name is 33.I`m 2.230000 years old
top9的结果是： My name is liu and my English name is crab.I`m 33 years old
