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from __future__ import annotations
import functools
import operator
import platform
import sys
from typing import TYPE_CHECKING, TypeVar
import pytest
from scrapy.utils.asyncgen import as_async_generator, collect_asyncgen
from scrapy.utils.defer import aiter_errback, deferred_f_from_coro_f
from scrapy.utils.python import (
MutableAsyncChain,
MutableChain,
binary_is_text,
get_func_args,
memoizemethod_noargs,
to_bytes,
to_unicode,
without_none_values,
)
if TYPE_CHECKING:
from collections.abc import Iterable, Mapping
_KT = TypeVar("_KT")
_VT = TypeVar("_VT")
def test_mutablechain():
m = MutableChain(range(2), [2, 3], (4, 5))
m.extend(range(6, 7))
m.extend([7, 8])
m.extend([9, 10], (11, 12))
assert next(m) == 0
assert m.__next__() == 1
assert list(m) == list(range(2, 13))
class TestMutableAsyncChain:
@staticmethod
async def g1():
for i in range(3):
yield i
@staticmethod
async def g2():
return
yield
@staticmethod
async def g3():
for i in range(7, 10):
yield i
@staticmethod
async def g4():
for i in range(3, 5):
yield i
1 / 0
for i in range(5, 7):
yield i
@deferred_f_from_coro_f
async def test_mutableasyncchain(self):
m = MutableAsyncChain(self.g1(), as_async_generator(range(3, 7)))
m.extend(self.g2())
m.extend(self.g3())
assert await m.__anext__() == 0
results = await collect_asyncgen(m)
assert results == list(range(1, 10))
@deferred_f_from_coro_f
async def test_mutableasyncchain_exc(self):
m = MutableAsyncChain(self.g1())
m.extend(self.g4())
m.extend(self.g3())
results = await collect_asyncgen(aiter_errback(m, lambda _: None))
assert results == list(range(5))
class TestToUnicode:
def test_converting_an_utf8_encoded_string_to_unicode(self):
assert to_unicode(b"lel\xc3\xb1e") == "lel\xf1e"
def test_converting_a_latin_1_encoded_string_to_unicode(self):
assert to_unicode(b"lel\xf1e", "latin-1") == "lel\xf1e"
def test_converting_a_unicode_to_unicode_should_return_the_same_object(self):
assert to_unicode("\xf1e\xf1e\xf1e") == "\xf1e\xf1e\xf1e"
def test_converting_a_strange_object_should_raise_type_error(self):
with pytest.raises(TypeError):
to_unicode(423)
def test_errors_argument(self):
assert to_unicode(b"a\xedb", "utf-8", errors="replace") == "a\ufffdb"
class TestToBytes:
def test_converting_a_unicode_object_to_an_utf_8_encoded_string(self):
assert to_bytes("\xa3 49") == b"\xc2\xa3 49"
def test_converting_a_unicode_object_to_a_latin_1_encoded_string(self):
assert to_bytes("\xa3 49", "latin-1") == b"\xa3 49"
def test_converting_a_regular_bytes_to_bytes_should_return_the_same_object(self):
assert to_bytes(b"lel\xf1e") == b"lel\xf1e"
def test_converting_a_strange_object_should_raise_type_error(self):
with pytest.raises(TypeError):
to_bytes(pytest)
def test_errors_argument(self):
assert to_bytes("a\ufffdb", "latin-1", errors="replace") == b"a?b"
def test_memoizemethod_noargs():
class A:
@memoizemethod_noargs
def cached(self):
return object()
def noncached(self):
return object()
a = A()
one = a.cached()
two = a.cached()
three = a.noncached()
assert one is two
assert one is not three
@pytest.mark.parametrize(
("value", "expected"),
[
(b"hello", True),
("hello".encode("utf-16"), True),
(b"<div>Price \xa3</div>", True),
(b"\x02\xa3", False),
],
)
def test_binaryistext(value: bytes, expected: bool) -> None:
assert binary_is_text(value) is expected
def test_get_func_args():
def f1(a, b, c):
pass
def f2(a, b=None, c=None):
pass
def f3(a, b=None, *, c=None):
pass
class A:
def __init__(self, a, b, c):
pass
def method(self, a, b, c):
pass
class Callable:
def __call__(self, a, b, c):
pass
a = A(1, 2, 3)
cal = Callable()
partial_f1 = functools.partial(f1, None)
partial_f2 = functools.partial(f1, b=None)
partial_f3 = functools.partial(partial_f2, None)
assert get_func_args(f1) == ["a", "b", "c"]
assert get_func_args(f2) == ["a", "b", "c"]
assert get_func_args(f3) == ["a", "b", "c"]
assert get_func_args(A) == ["a", "b", "c"]
assert get_func_args(a.method) == ["a", "b", "c"]
assert get_func_args(partial_f1) == ["b", "c"]
assert get_func_args(partial_f2) == ["a", "c"]
assert get_func_args(partial_f3) == ["c"]
assert get_func_args(cal) == ["a", "b", "c"]
assert get_func_args(object) == [] # pylint: disable=use-implicit-booleaness-not-comparison
assert get_func_args(str.split, stripself=True) == ["sep", "maxsplit"]
assert get_func_args(" ".join, stripself=True) == ["iterable"]
if sys.version_info >= (3, 13) or platform.python_implementation() == "PyPy":
# the correct and correctly extracted signature
assert get_func_args(operator.itemgetter(2), stripself=True) == ["obj"]
elif platform.python_implementation() == "CPython":
# ["args", "kwargs"] is a correct result for the pre-3.13 incorrect function signature
# [] is an incorrect result on even older CPython (https://github.com/python/cpython/issues/86951)
assert get_func_args(operator.itemgetter(2), stripself=True) in [
[],
["args", "kwargs"],
]
@pytest.mark.parametrize(
("value", "expected"),
[
([1, None, 3, 4], [1, 3, 4]),
((1, None, 3, 4), (1, 3, 4)),
(
{"one": 1, "none": None, "three": 3, "four": 4},
{"one": 1, "three": 3, "four": 4},
),
],
)
def test_without_none_values(
value: Mapping[_KT, _VT] | Iterable[_KT], expected: dict[_KT, _VT] | Iterable[_KT]
) -> None:
assert without_none_values(value) == expected
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