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']

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

#! /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

#! /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

 一些循环

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

values = ["a", "b", "c"]
for i in range(len(values)):
    print(i)
for i in range(len(values)):
    print(i, values[i])
valuesa = ["a", "b", "c"]
for i in range(len(valuesa)):
    valuesa[i] = "x"  # 解决翻倍问题
print(valuesa)
valuesa1 = [1, 5, 9]
for i in range(len(valuesa1)):
    valuesa1[i] = 2 * valuesa1[i]  # 解决翻倍问题
print(valuesa1)
valuesa2 = [1, 5, 9]
for i in range(len(valuesa2)):
    valuesa2[i] *= 2  # 解决翻倍问题
print(valuesa2)
print("*" * 50)
for i in enumerate("abc"):
    print(i)
print("*" * 50)
for i in enumerate([10, 20, 30]):
    print(i)

print("@" * 50)
va = [1, 3, 6]
for i, v in enumerate(va):
    
    va[i] = 2 * v
print(va)

a, b, c = [1, 2, 3]  # (1, 2, 3)或 1, 2, 3
print(a)
print(b)
print(c)

times = [
    [19, 89, 34],
    [13, 89, 47, 385],
    [56, 34]
]
for i in times:
    for j in i:
        print(j, end="	")
    print()
for i in times:
    for j in i:
        print(j, end="	")
    print()
for i in times:
    for j in i:
        print(j, end="	")
    print()

for i in times:
    for j in i:
        print(j, end="	")


输出结果：

0
1
2
0 a
1 b
2 c
['x', 'x', 'x']
[2, 10, 18]
[2, 10, 18]
**************************************************
(0, 'a')
(1, 'b')
(2, 'c')
**************************************************
(0, 10)
(1, 20)
(2, 30)
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
[2, 6, 12]
1
2
3
19    89    34    
13    89    47    385    
56    34    
19    89    34    
13    89    47    385    
56    34    
19    89    34    
13    89    47    385    
56    34    
19    89    34    13    89    47    385    56    34