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python开辟_python中str.format()
添加时间:2013-7-27 点击量:格局化一个字符串的输出成果,我们在很多处所都可以看到,如:c/c++中都有见过
下面看看python中的字符串格局函数str.format():
1 #应用str.format()函数
2
3 #应用{}占位符
4 print(I\m {},{}.format(Hongten,Welcome to my space!))
5
6 print(# 40)
7
8 #也可以应用{0},{1}情势的占位符
9 print({0},I\m {1},my E-mail is {2}.format(Hello,Hongten,hongtenzone@foxmail.com))
10 #可以改变占位符的地位
11 print({1},I\m {0},my E-mail is {2}.format(Hongten,Hello,hongtenzone@foxmail.com))
12
13 print(# 40)
14
15 #应用{name}情势的占位符
16 print(Hi,{name},{message}.format(name = Tom,message = How old are you?))
17
18 print(# 40)
19
20 #混淆应用{0},{name}情势
21 print({0},I\m {1},{message}.format(Hello,Hongten,message = This is a test message!))
22
23 print(# 40)
24
25 #下面进行格局把握
26 import math
27 print(The value of PI is approximately {}..format(math.pi))
28 print(The value of PI is approximately {!r}..format(math.pi))
29 print(The value of PI is approximately {0:.3f}..format(math.pi))
30
31
32 table = {Sjoerd: 4127, Jack: 4098, Dcab: 7678}
33 for name, phone in table.items():
34 print({0:10} ==> {1:10d}.format(name, phone))
35
36
37 table = {Sjoerd: 4127, Jack: 4098, Dcab: 8637678}
38 print(Jack: {0[Jack]:d}; Sjoerd: {0[Sjoerd]:d}; Dcab: {0[Dcab]:d}.format(table))运行结果:
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type copyright, credits or license() for more information.
>>> ================================ RESTART ================================
>>>
Im Hongten,Welcome to my space!
########################################
Hello,Im Hongten,my E-mail is hongtenzone@foxmail.com
Hello,Im Hongten,my E-mail is hongtenzone@foxmail.com
########################################
Hi,Tom,How old are you?
########################################
Hello,Im Hongten,This is a test message!
########################################
The value of PI is approximately 3.141592653589793.
The value of PI is approximately 3.141592653589793.
The value of PI is approximately 3.142.
Jack ==> 4098
Sjoerd ==> 4127
Dcab ==> 7678
Jack: 4098; Sjoerd: 4127; Dcab: 8637678
>>>