learn-python/src/operators/test_assigment.py at master · arianshi/learn-python · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
"""Assignment operators

赋值运算符 (Assignment Operators)

@see: https://www.w3schools.com/python/python_operators.asp

Assignment operators are used to assign values to variables

赋值运算符用于将值赋给变量。
"""


def test_assignment_operator():
    """Assignment operator """
    # 赋值运算符

    # Assignment: =
    # 赋值运算符：=
    number = 5
    assert number == 5

    # Multiple assignment.
    # The variables first_variable and second_variable simultaneously get the new values 0 and 1.
    # 多重赋值。
    # 变量 first_variable 和 second_variable 同时分别获得新值 0 和 1。
    first_variable, second_variable = 0, 1
    assert first_variable == 0
    assert second_variable == 1

    # You may even switch variable values using multiple assignment.
    # 你甚至可以使用多重赋值来交换变量的值。
    first_variable, second_variable = second_variable, first_variable
    assert first_variable == 1
    assert second_variable == 0


def test_augmented_assignment_operators():
    """Assignment operator combined with arithmetic and bitwise operators"""
    # 与算术运算符和位运算符组合而成的复合赋值运算符。

    # Assignment: +=
    # 复合赋值：+=
    number = 5
    number += 3
    assert number == 8

    # Assignment: -=
    # 复合赋值：-=
    number = 5
    number -= 3
    assert number == 2

    # Assignment: *=
    # 复合赋值：*=
    number = 5
    number *= 3
    assert number == 15

    # Assignment: /=
    # 复合赋值：/=
    number = 8
    number /= 4
    assert number == 2

    # Assignment: %=
    # 复合赋值：%=
    number = 8
    number %= 3
    assert number == 2

    # Assignment: %=
    # 复合赋值：%=
    number = 5
    number %= 3
    assert number == 2

    # Assignment: //=
    # 复合赋值：//=
    number = 5
    number //= 3
    assert number == 1

    # Assignment: **=
    # 复合赋值：**=
    number = 5
    number **= 3
    assert number == 125

    # Assignment: &=
    # 复合赋值：&=
    number = 5  # 0b0101
    number &= 3  # 0b0011
    assert number == 1  # 0b0001

    # Assignment: |=
    # 复合赋值：|=
    number = 5  # 0b0101
    number |= 3  # 0b0011
    assert number == 7  # 0b0111

    # Assignment: ^=
    # 复合赋值：^=
    number = 5  # 0b0101
    number ^= 3  # 0b0011
    assert number == 6  # 0b0110

    # Assignment: >>=
    # 复合赋值：>>=
    number = 5
    number >>= 3
    assert number == 0  # (((5 // 2) // 2) // 2)

    # Assignment: <<=
    # 复合赋值：<<=
    number = 5
    number <<= 3
    assert number == 40  # 5 * 2 * 2 * 2