python--函数每天熟悉一个

 1 #使用str.format()函数
 2 
 3 #使用‘{}‘占位符
 4 print(‘I\‘m {},{}‘.format(‘Hongten‘,‘Welcome to my space!‘))
 5 
 6 print(‘#‘ * 40)
 7 
 8 #也可以使用‘{0}‘,‘{1}‘形式的占位符
 9 print(‘{0},I\‘m {1},my E-mail is {2}‘.format(‘Hello‘,‘Hongten‘,‘hongtenzone@foxmail.com‘))
10 #可以改变占位符的位置
11 print(‘{1},I\‘m {0},my E-mail is {2}‘.format(‘Hongten‘,‘Hello‘,‘hongtenzone@foxmail.com‘))
12 
13 print(‘#‘ * 40)
14 
15 #使用‘{name}‘形式的占位符
16 print(‘Hi,{name},{message}‘.format(name = ‘Tom‘,message = ‘How old are you?‘))
17 
18 print(‘#‘ * 40)
19 
20 #混合使用‘{0}‘,‘{name}‘形式
21 print(‘{0},I\‘m {1},{message}‘.format(‘Hello‘,‘Hongten‘,message = ‘This is a test message!‘))
22 
23 print(‘#‘ * 40)
24 
25 #下面进行格式控制
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))

 1 #！/usr/bin/env python
 2 #_*_coding utf-8 _*_
 3 
 4 i = 0
 5 seq = [‘one‘, ‘two‘, ‘three‘]
 6 for element in seq:
 7     print(i, seq[i])
 8     i += 1
 9 #0 one
10 #1 two
11 #2 three
12 
13 print("#"*40)
14 seq = [‘one‘, ‘two‘, ‘three‘]
15 for i, element in enumerate(seq):
16     print(i, seq[i])
17 
18 print("#"*40)
19 for i,j in enumerate(‘abc‘):
20     print(i,j)
21 #0 a
22 #1 b
23 #2 c
24 
25 print("#"*40)
26 def _treatment(pos, element):
27     return ‘%d: %s‘ %(pos, element)
28 
29 seq = [‘one‘, ‘two‘, ‘three‘]
30 print([_treatment(i, e1) for i, e1 in enumerate(seq)])