monty 0.0.21

A sandboxed, snapshotable Python interpreter written in Rust.
Documentation 
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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153

# === Basic tuple unpacking ===
a, b = (1, 2)
assert a == 1
assert b == 2

# === Unpacking without parentheses ===
x, y = 10, 20
assert x == 10
assert y == 20

# === Three element unpacking ===
a, b, c = (1, 2, 3)
assert a == 1
assert b == 2
assert c == 3


# === Unpacking from function return ===
def returns_pair():
    return 42, 37


x, y = returns_pair()
assert x == 42
assert y == 37


def returns_triple():
    return 'a', 'b', 'c'


p, q, r = returns_triple()
assert p == 'a'
assert q == 'b'
assert r == 'c'

# === Unpacking list ===
a, b = [100, 200]
assert a == 100
assert b == 200

a, b, c, d = [1, 2, 3, 4]
assert a == 1
assert d == 4

# === Unpacking string ===
a, b = 'xy'
assert a == 'x'
assert b == 'y'

p, q, r = 'abc'
assert p == 'a'
assert q == 'b'
assert r == 'c'

# === Unpacking with different value types ===
a, b = (True, False)
assert a is True
assert b is False

a, b = (1.5, 2.5)
assert a == 1.5
assert b == 2.5

a, b = (None, 42)
assert a is None
assert b == 42

# === Unpacking with nested containers ===
a, b = ([1, 2], [3, 4])
assert a == [1, 2]
assert b == [3, 4]

a, b = ((1, 2), (3, 4))
assert a == (1, 2)
assert b == (3, 4)

# === Reassignment via unpacking ===
x = 1
y = 2
x, y = y, x
assert x == 2
assert y == 1

# === Single element tuple (edge case) ===
# Note: (x,) = (1,) is valid Python
(a,) = (42,)
assert a == 42

(a,) = [99]
assert a == 99

(a,) = 'z'
assert a == 'z'

# === Star unpacking (extended unpacking) ===
# Star at end
first, *rest = [1, 2, 3, 4, 5]
assert first == 1
assert rest == [2, 3, 4, 5]

# Star at start
*init, last = [1, 2, 3, 4, 5]
assert init == [1, 2, 3, 4]
assert last == 5

# Star in middle
first, *middle, last = [1, 2, 3, 4, 5]
assert first == 1
assert middle == [2, 3, 4]
assert last == 5

# Empty rest (minimum values)
first, *rest, last = [1, 2]
assert first == 1
assert rest == []
assert last == 2

# From tuple
a, *b = (10, 20, 30)
assert a == 10
assert b == [20, 30]

# From string
first, *mid, last = 'abcde'
assert first == 'a'
assert mid == ['b', 'c', 'd']
assert last == 'e'

# With more targets before star
a, b, c, *rest = [1, 2, 3, 4, 5, 6]
assert a == 1
assert b == 2
assert c == 3
assert rest == [4, 5, 6]

# With more targets after star
*init, x, y, z = [1, 2, 3, 4, 5, 6]
assert init == [1, 2, 3]
assert x == 4
assert y == 5
assert z == 6

# Star captures all but one
head, *tail = [1]
assert head == 1
assert tail == []

# Star with bracket syntax
[a, *b, c] = [1, 2, 3, 4]
assert a == 1
assert b == [2, 3]
assert c == 4