blob: 7ede436bb974978037e4f478247e189a77a4f14c (
plain)
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
|
"""https://github.com/pylint-dev/pylint/issues/85"""
def main():
"""When evaluating finally blocks, assume try statements fail."""
try:
res = 1 / 0
res = 42
finally:
print(res) # [used-before-assignment]
print(res)
def try_except_finally():
"""When evaluating finally blocks, assume try statements fail."""
try:
res = 1 / 0
res = 42
except ZeroDivisionError:
print()
finally:
print(res) # [used-before-assignment]
print(res)
def try_except_finally_assignment_in_final_block():
"""Assignment of the name in the final block does not warn."""
try:
res = 1 / 0
res = 42
except ZeroDivisionError:
print()
finally:
res = 999
print(res)
print(res)
def try_except_finally_nested_try_finally_in_try():
"""Don't confuse assignments in different finally statements where
one is nested inside a try.
"""
try:
try:
res = 1 / 0
finally:
print(res) # [used-before-assignment]
print(1 / 0)
except ZeroDivisionError:
print()
finally:
res = 999 # this assignment could be confused for that above
print(res)
print(res)
def try_except_finally_nested_in_finally():
"""Until Pylint comes to a consensus on requiring all except handlers to
define a name, raise, or return (https://github.com/pylint-dev/pylint/issues/5524),
Pylint assumes statements in try blocks succeed when accessed *after*
except or finally blocks and fail when accessed *in* except or finally
blocks.)
"""
try:
outer_times = 1
finally:
try:
inner_times = 1
except TypeError:
pass
finally:
print(outer_times) # [used-before-assignment]
print(inner_times) # see docstring: might emit in a future version
def try_except_finally_nested_in_finally_2():
"""Neither name is accessed after a finally block."""
try:
outer_times = 1
finally:
try:
inner_times = 1
except TypeError:
pass
finally:
print(inner_times) # [used-before-assignment]
print(outer_times) # [used-before-assignment]
def try_except_finally_nested_in_finally_3():
"""One name is never accessed after a finally block, but just emit
once per name.
"""
try:
outer_times = 1
finally:
try:
inner_times = 1
except TypeError:
pass
finally:
print(inner_times) # [used-before-assignment]
print(outer_times) # [used-before-assignment]
print(inner_times)
# used-before-assignment is only raised once per name
print(outer_times)
def try_except_finally_nested_in_finally_4():
"""Triple nesting: don't assume direct parentages of outer try/finally
and inner try/finally.
"""
try:
outer_times = 1
finally:
try:
pass
finally:
try:
inner_times = 1
except TypeError:
pass
finally:
print(inner_times) # [used-before-assignment]
print(outer_times) # [used-before-assignment]
print(inner_times)
# used-before-assignment is only raised once per name
print(outer_times)
|
