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# copyright 2003-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of astroid.
#
# astroid is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 2.1 of the License, or (at your
# option) any later version.
#
# astroid is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with astroid. If not, see <http://www.gnu.org/licenses/>.
from textwrap import dedent
import unittest
from astroid import nodes
from astroid.tree.node_classes import Assign, Expr, YieldFrom, Name, Const
from astroid import raw_building
from astroid.builder import AstroidBuilder
from astroid.tree.scoped_nodes import ClassDef, FunctionDef
from astroid.test_utils import require_version, extract_node
class Python3TC(unittest.TestCase):
@classmethod
def setUpClass(cls):
cls.builder = AstroidBuilder()
@require_version('3.0')
def test_starred_notation(self):
astroid = self.builder.string_build("*a, b = [1, 2, 3]", 'test', 'test')
# Get the star node
node = next(next(next(astroid.get_children()).get_children()).get_children())
self.assertTrue(isinstance(node.assign_type(), Assign))
@require_version('3.3')
def test_yield_from(self):
body = dedent("""
def func():
yield from iter([1, 2])
""")
astroid = self.builder.string_build(body)
func = astroid.body[0]
self.assertIsInstance(func, FunctionDef)
yieldfrom_stmt = func.body[0]
self.assertIsInstance(yieldfrom_stmt, Expr)
self.assertIsInstance(yieldfrom_stmt.value, YieldFrom)
self.assertEqual(yieldfrom_stmt.as_string(),
'yield from iter([1, 2])')
@require_version('3.3')
def test_yield_from_is_generator(self):
body = dedent("""
def func():
yield from iter([1, 2])
""")
astroid = self.builder.string_build(body)
func = astroid.body[0]
self.assertIsInstance(func, FunctionDef)
self.assertTrue(func.is_generator())
@require_version('3.3')
def test_yield_from_as_string(self):
body = dedent("""
def func():
yield from iter([1, 2])
value = yield from other()
""")
astroid = self.builder.string_build(body)
func = astroid.body[0]
self.assertEqual(func.as_string().strip(), body.strip())
# metaclass tests
@require_version('3.0')
def test_simple_metaclass(self):
astroid = self.builder.string_build("class Test(metaclass=type): pass")
klass = astroid.body[0]
metaclass = klass.metaclass()
self.assertIsInstance(metaclass, ClassDef)
self.assertEqual(metaclass.name, 'type')
@require_version('3.0')
def test_metaclass_error(self):
astroid = self.builder.string_build("class Test(metaclass=typ): pass")
klass = astroid.body[0]
self.assertFalse(klass.metaclass())
@require_version('3.0')
def test_metaclass_imported(self):
astroid = self.builder.string_build(dedent("""
from abc import ABCMeta
class Test(metaclass=ABCMeta): pass"""))
klass = astroid.body[1]
metaclass = klass.metaclass()
self.assertIsInstance(metaclass, ClassDef)
self.assertEqual(metaclass.name, 'ABCMeta')
@require_version('3.0')
def test_as_string(self):
body = dedent("""
from abc import ABCMeta
class Test(metaclass=ABCMeta): pass""")
astroid = self.builder.string_build(body)
klass = astroid.body[1]
self.assertEqual(klass.as_string(),
'\n\nclass Test(metaclass=ABCMeta):\n pass\n')
@require_version('3.0')
def test_old_syntax_works(self):
astroid = self.builder.string_build(dedent("""
class Test:
__metaclass__ = type
class SubTest(Test): pass
"""))
klass = astroid['SubTest']
metaclass = klass.metaclass()
self.assertIsNone(metaclass)
@require_version('3.0')
def test_metaclass_yes_leak(self):
astroid = self.builder.string_build(dedent("""
# notice `ab` instead of `abc`
from ab import ABCMeta
class Meta(metaclass=ABCMeta): pass
"""))
klass = astroid['Meta']
self.assertIsNone(klass.metaclass())
@require_version('3.0')
def test_parent_metaclass(self):
astroid = self.builder.string_build(dedent("""
from abc import ABCMeta
class Test(metaclass=ABCMeta): pass
class SubTest(Test): pass
"""))
klass = astroid['SubTest']
self.assertTrue(klass.newstyle)
metaclass = klass.metaclass()
self.assertIsInstance(metaclass, ClassDef)
self.assertEqual(metaclass.name, 'ABCMeta')
@require_version('3.0')
def test_metaclass_ancestors(self):
astroid = self.builder.string_build(dedent("""
from abc import ABCMeta
class FirstMeta(metaclass=ABCMeta): pass
class SecondMeta(metaclass=type):
pass
class Simple:
pass
class FirstImpl(FirstMeta): pass
class SecondImpl(FirstImpl): pass
class ThirdImpl(Simple, SecondMeta):
pass
"""))
classes = {
'ABCMeta': ('FirstImpl', 'SecondImpl'),
'type': ('ThirdImpl', )
}
for metaclass, names in classes.items():
for name in names:
impl = astroid[name]
meta = impl.metaclass()
self.assertIsInstance(meta, ClassDef)
self.assertEqual(meta.name, metaclass)
@require_version('3.0')
def test_annotation_support(self):
astroid = self.builder.string_build(dedent("""
def test(a: int, b: str, c: None, d, e,
*args: float, **kwargs: int)->int:
pass
"""))
func = astroid['test']
self.assertIsInstance(func.args.vararg.annotation, Name)
self.assertEqual(func.args.vararg.annotation.name, 'float')
self.assertIsInstance(func.args.kwarg.annotation, Name)
self.assertEqual(func.args.kwarg.annotation.name, 'int')
self.assertIsInstance(func.returns, Name)
self.assertEqual(func.returns.name, 'int')
arguments = func.args
self.assertIsInstance(arguments.args[0].annotation, Name)
self.assertEqual(arguments.args[0].annotation.name, 'int')
self.assertIsInstance(arguments.args[1].annotation, Name)
self.assertEqual(arguments.args[1].annotation.name, 'str')
self.assertIsInstance(arguments.args[2].annotation, Const)
self.assertIsNone(arguments.args[2].annotation.value)
self.assertIs(arguments.args[3].annotation, nodes.Empty)
self.assertIs(arguments.args[4].annotation, nodes.Empty)
astroid = self.builder.string_build(dedent("""
def test(a: int=1, b: str=2):
pass
"""))
func = astroid['test']
self.assertIsInstance(func.args.args[0].annotation, Name)
self.assertEqual(func.args.args[0].annotation.name, 'int')
self.assertIsInstance(func.args.args[1].annotation, Name)
self.assertEqual(func.args.args[1].annotation.name, 'str')
self.assertIs(func.returns, nodes.Empty)
@require_version('3.0')
def test_annotation_as_string(self):
code1 = dedent('''
def test(a, b:int=4, c=2, f:'lala'=4)->2:
pass''')
code2 = dedent('''
def test(a:typing.Generic[T], c:typing.Any=24)->typing.Iterable:
pass''')
for code in (code1, code2):
func = extract_node(code)
self.assertEqual(func.as_string(), code)
@require_version('3.5')
def test_unpacking_in_dicts(self):
code = "{'x': 1, **{'y': 2}}"
node = extract_node(code)
self.assertEqual(node.as_string(), code)
keys = [key for (key, _) in node.items]
self.assertIsInstance(keys[0], nodes.Const)
self.assertIsInstance(keys[1], nodes.DictUnpack)
@require_version('3.5')
def test_nested_unpacking_in_dicts(self):
code = "{'x': 1, **{'y': 2, **{'z': 3}}}"
node = extract_node(code)
self.assertEqual(node.as_string(), code)
@require_version('3.5')
def test_unpacking_in_dict_getitem(self):
node = extract_node('{1:2, **{2:3, 3:4}, **{5: 6}}')
for key, expected in ((1, 2), (2, 3), (3, 4), (5, 6)):
value = node.getitem(key)
self.assertIsInstance(value, nodes.Const)
self.assertEqual(value.value, expected)
@require_version('3.4')
def test_positional_only_parameters(self):
ast = raw_building.ast_from_object(issubclass)
self.assertEqual(len(ast.args.positional_only), 2)
for name, arg in zip(('cls', 'class_or_tuple'), ast.args.positional_only):
self.assertEqual(arg.name, name)
if __name__ == '__main__':
unittest.main()
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