杂

查看python 关键字（保留字）：

>>> import keyword
>>> print(keyword.kwlist)
['False', 'None', 'True', 'and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield']
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枚举

#! /urs/bin/evn python
# -*- coding:utf-8 -*-
index = 0
for i in range(1, 6):
    print(index, i)
    index += 1


0 1
1 2
2 3
3 4
4 5
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#! /urs/bin/evn python
# -*- coding:utf-8 -*-

for index, i in enumerate(range(1, 6)):
    print(index, i)



0 1
1 2
2 3
3 4
4 5
View Code

 

#! /urs/bin/evn python
# -*- coding:utf-8 -*-

for index, i in enumerate([1, 2, 3, 4, 5]):
    print(index, i)




0 1
1 2
2 3
3 4
4 5
View Code

 一些循环

 1 #! /urs/bin/evn python
 2 # -*- coding:utf-8 -*-
 3 
 4 values = ["a", "b", "c"]
 5 for i in range(len(values)):
 6     print(i)
 7 for i in range(len(values)):
 8     print(i, values[i])
 9 valuesa = ["a", "b", "c"]
10 for i in range(len(valuesa)):
11     valuesa[i] = "x"  # 解决翻倍问题
12 print(valuesa)
13 valuesa1 = [1, 5, 9]
14 for i in range(len(valuesa1)):
15     valuesa1[i] = 2 * valuesa1[i]  # 解决翻倍问题
16 print(valuesa1)
17 valuesa2 = [1, 5, 9]
18 for i in range(len(valuesa2)):
19     valuesa2[i] *= 2  # 解决翻倍问题
20 print(valuesa2)
21 print("*" * 50)
22 for i in enumerate("abc"):
23     print(i)
24 print("*" * 50)
25 for i in enumerate([10, 20, 30]):
26     print(i)
27 
28 print("@" * 50)
29 va = [1, 3, 6]
30 for i, v in enumerate(va):
31     
32     va[i] = 2 * v
33 print(va)
34 
35 a, b, c = [1, 2, 3]  # (1, 2, 3)或 1, 2, 3
36 print(a)
37 print(b)
38 print(c)
39 
40 times = [
41     [19, 89, 34],
42     [13, 89, 47, 385],
43     [56, 34]
44 ]
45 for i in times:
46     for j in i:
47         print(j, end="\t")
48     print()
49 for i in times:
50     for j in i:
51         print(j, end="\t")
52     print()
53 for i in times:
54     for j in i:
55         print(j, end="\t")
56     print()
57 
58 for i in times:
59     for j in i:
60         print(j, end="\t")
61 
62 
63 输出结果：
64 
65 0
66 1
67 2
68 0 a
69 1 b
70 2 c
71 ['x', 'x', 'x']
72 [2, 10, 18]
73 [2, 10, 18]
74 **************************************************
75 (0, 'a')
76 (1, 'b')
77 (2, 'c')
78 **************************************************
79 (0, 10)
80 (1, 20)
81 (2, 30)
82 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
83 [2, 6, 12]
84 1
85 2
86 3
87 19    89    34    
88 13    89    47    385    
89 56    34    
90 19    89    34    
91 13    89    47    385    
92 56    34    
93 19    89    34    
94 13    89    47    385    
95 56    34    
96 19    89    34    13    89    47    385    56    34
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posted @ 2018-04-17 10:16  zqxqx  阅读(115)  评论(0)  编辑  收藏  举报