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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/pylint-dev/astroid/blob/main/LICENSE
# Copyright (c) https://github.com/pylint-dev/astroid/blob/main/CONTRIBUTORS.txt
import unittest
from astroid import Uninferable, builder, extract_node, nodes
from astroid.exceptions import InferenceError
class InferenceUtil(unittest.TestCase):
def test_not_exclusive(self) -> None:
module = builder.parse(
"""
x = 10
for x in range(5):
print (x)
if x > 0:
print ('#' * x)
""",
__name__,
__file__,
)
xass1 = module.locals["x"][0]
assert xass1.lineno == 2
xnames = [n for n in module.nodes_of_class(nodes.Name) if n.name == "x"]
assert len(xnames) == 3
assert xnames[1].lineno == 6
self.assertEqual(nodes.are_exclusive(xass1, xnames[1]), False)
self.assertEqual(nodes.are_exclusive(xass1, xnames[2]), False)
def test_not_exclusive_walrus_operator(self) -> None:
node_if, node_body, node_or_else = extract_node(
"""
if val := True: #@
print(val) #@
else:
print(val) #@
"""
)
node_if: nodes.If
node_walrus = next(node_if.nodes_of_class(nodes.NamedExpr))
assert nodes.are_exclusive(node_walrus, node_if) is False
assert nodes.are_exclusive(node_walrus, node_body) is False
assert nodes.are_exclusive(node_walrus, node_or_else) is False
assert nodes.are_exclusive(node_if, node_body) is False
assert nodes.are_exclusive(node_if, node_or_else) is False
assert nodes.are_exclusive(node_body, node_or_else) is True
def test_not_exclusive_walrus_multiple(self) -> None:
node_if, body_1, body_2, or_else_1, or_else_2 = extract_node(
"""
if (val := True) or (val_2 := True): #@
print(val) #@
print(val_2) #@
else:
print(val) #@
print(val_2) #@
"""
)
node_if: nodes.If
walruses = list(node_if.nodes_of_class(nodes.NamedExpr))
assert nodes.are_exclusive(node_if, walruses[0]) is False
assert nodes.are_exclusive(node_if, walruses[1]) is False
assert nodes.are_exclusive(walruses[0], walruses[1]) is False
assert nodes.are_exclusive(walruses[0], body_1) is False
assert nodes.are_exclusive(walruses[0], body_2) is False
assert nodes.are_exclusive(walruses[1], body_1) is False
assert nodes.are_exclusive(walruses[1], body_2) is False
assert nodes.are_exclusive(walruses[0], or_else_1) is False
assert nodes.are_exclusive(walruses[0], or_else_2) is False
assert nodes.are_exclusive(walruses[1], or_else_1) is False
assert nodes.are_exclusive(walruses[1], or_else_2) is False
def test_not_exclusive_walrus_operator_nested(self) -> None:
node_if, node_body, node_or_else = extract_node(
"""
if all((last_val := i) % 2 == 0 for i in range(10)): #@
print(last_val) #@
else:
print(last_val) #@
"""
)
node_if: nodes.If
node_walrus = next(node_if.nodes_of_class(nodes.NamedExpr))
assert nodes.are_exclusive(node_walrus, node_if) is False
assert nodes.are_exclusive(node_walrus, node_body) is False
assert nodes.are_exclusive(node_walrus, node_or_else) is False
assert nodes.are_exclusive(node_if, node_body) is False
assert nodes.are_exclusive(node_if, node_or_else) is False
assert nodes.are_exclusive(node_body, node_or_else) is True
def test_if(self) -> None:
module = builder.parse(
"""
if 1:
a = 1
a = 2
elif 2:
a = 12
a = 13
else:
a = 3
a = 4
"""
)
a1 = module.locals["a"][0]
a2 = module.locals["a"][1]
a3 = module.locals["a"][2]
a4 = module.locals["a"][3]
a5 = module.locals["a"][4]
a6 = module.locals["a"][5]
self.assertEqual(nodes.are_exclusive(a1, a2), False)
self.assertEqual(nodes.are_exclusive(a1, a3), True)
self.assertEqual(nodes.are_exclusive(a1, a5), True)
self.assertEqual(nodes.are_exclusive(a3, a5), True)
self.assertEqual(nodes.are_exclusive(a3, a4), False)
self.assertEqual(nodes.are_exclusive(a5, a6), False)
def test_try_except(self) -> None:
module = builder.parse(
"""
try:
def exclusive_func2():
"docstring"
except TypeError:
def exclusive_func2():
"docstring"
except:
def exclusive_func2():
"docstring"
else:
def exclusive_func2():
"this one redefine the one defined line 42"
"""
)
f1 = module.locals["exclusive_func2"][0]
f2 = module.locals["exclusive_func2"][1]
f3 = module.locals["exclusive_func2"][2]
f4 = module.locals["exclusive_func2"][3]
self.assertEqual(nodes.are_exclusive(f1, f2), True)
self.assertEqual(nodes.are_exclusive(f1, f3), True)
self.assertEqual(nodes.are_exclusive(f1, f4), False)
self.assertEqual(nodes.are_exclusive(f2, f4), True)
self.assertEqual(nodes.are_exclusive(f3, f4), True)
self.assertEqual(nodes.are_exclusive(f3, f2), True)
self.assertEqual(nodes.are_exclusive(f2, f1), True)
self.assertEqual(nodes.are_exclusive(f4, f1), False)
self.assertEqual(nodes.are_exclusive(f4, f2), True)
def test_unpack_infer_uninferable_nodes(self) -> None:
node = builder.extract_node(
"""
x = [A] * 1
f = [x, [A] * 2]
f
"""
)
inferred = next(node.infer())
unpacked = list(nodes.unpack_infer(inferred))
self.assertEqual(len(unpacked), 3)
self.assertTrue(all(elt is Uninferable for elt in unpacked))
def test_unpack_infer_empty_tuple(self) -> None:
node = builder.extract_node(
"""
()
"""
)
inferred = next(node.infer())
with self.assertRaises(InferenceError):
list(nodes.unpack_infer(inferred))
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