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test_comprehension_checker.py
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test_comprehension_checker.py
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import astroid
import perflint.comprehension_checker
from base import BaseCheckerTestCase
class TestComprehensionChecker(BaseCheckerTestCase):
CHECKER_CLASS = perflint.comprehension_checker.ComprehensionChecker
def test_simple_list_filter(self):
test_func = astroid.extract_node(
"""
def test(): #@
items = [1,2,3,4]
result = []
for i in items:
if i % 2:
result.append(i)
"""
)
with self.assertAddedMessage("use-list-comprehension"):
self.walk(test_func)
def test_complex_list_filter(self):
test_func = astroid.extract_node(
"""
def test(): #@
items = [1,2,3,4]
result = []
for i in items:
if i % 2:
result.append(i)
elif i % 2:
result.append(i)
else:
result.append(i)
"""
)
with self.assertNoMessages():
self.walk(test_func)
def test_simple_list_copy(self):
test_func = astroid.extract_node(
"""
def test(): #@
items = [1,2,3,4]
result = []
for i in items:
result.append(i)
"""
)
with self.assertAddedMessage("use-list-copy"):
self.walk(test_func)
def test_simple_dict_assignment(self):
test_func = astroid.extract_node(
"""
def test(): #@
result = {}
fruit = ["apple", "pear", "orange"]
for idx, name in enumerate(fruit):
result[idx] = name
"""
)
with self.assertAddedMessage("use-dict-comprehension"):
self.walk(test_func)
def test_filtered_dict_assignment(self):
test_func = astroid.extract_node(
"""
def test(): #@
result = {}
fruit = ["apple", "pear", "orange"]
for idx, name in enumerate(fruit):
if idx % 2:
result[idx] = name
"""
)
with self.assertAddedMessage("use-dict-comprehension"):
self.walk(test_func)
def test_complex_filtered_dict_assignment(self):
test_func = astroid.extract_node(
"""
def test(): #@
result = {}
fruit = ["apple", "pear", "orange"]
for idx, name in enumerate(fruit):
if idx % 2:
result[idx] = name
elif idx % 3:
result[idx] = name
else:
result[idx] = name
"""
)
with self.assertNoMessages():
self.walk(test_func)
def test_complex_filtered_dict_assignment2(self):
test_func = astroid.extract_node(
"""
def test(): #@
result = {}
fruit = ["apple", "pear", "orange"]
for idx, name in enumerate(fruit):
if idx % 2:
result[idx] = name
else:
result[idx] = name
"""
)
with self.assertNoMessages():
self.walk(test_func)