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import functools
import operator
import platform
import sys
import pytest
from twisted.trial import unittest
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,
equal_attributes,
get_func_args,
memoizemethod_noargs,
to_bytes,
to_unicode,
without_none_values,
)
class TestMutableChain:
def test_mutablechain(self):
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(unittest.TestCase):
@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"
class TestMemoizedMethod:
def test_memoizemethod_noargs(self):
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
class TestBinaryIsText:
def test_binaryistext(self):
assert binary_is_text(b"hello")
def test_utf_16_strings_contain_null_bytes(self):
assert binary_is_text("hello".encode("utf-16"))
def test_one_with_encoding(self):
assert binary_is_text(b"<div>Price \xa3</div>")
def test_real_binary_bytes(self):
assert not binary_is_text(b"\x02\xa3")
class TestUtilsPython:
@pytest.mark.filterwarnings("ignore::scrapy.exceptions.ScrapyDeprecationWarning")
def test_equal_attributes(self):
class Obj:
pass
a = Obj()
b = Obj()
# no attributes given return False
assert not equal_attributes(a, b, [])
# nonexistent attributes
assert not equal_attributes(a, b, ["x", "y"])
a.x = 1
b.x = 1
# equal attribute
assert equal_attributes(a, b, ["x"])
b.y = 2
# obj1 has no attribute y
assert not equal_attributes(a, b, ["x", "y"])
a.y = 2
# equal attributes
assert equal_attributes(a, b, ["x", "y"])
a.y = 1
# different attributes
assert not equal_attributes(a, b, ["x", "y"])
# test callable
a.meta = {}
b.meta = {}
assert equal_attributes(a, b, ["meta"])
# compare ['meta']['a']
a.meta["z"] = 1
b.meta["z"] = 1
get_z = operator.itemgetter("z")
get_meta = operator.attrgetter("meta")
def compare_z(obj):
return get_z(get_meta(obj))
assert equal_attributes(a, b, [compare_z, "x"])
# fail z equality
a.meta["z"] = 2
assert not equal_attributes(a, b, [compare_z, "x"])
def test_get_func_args(self):
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) == []
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"],
]
def test_without_none_values(self):
assert without_none_values([1, None, 3, 4]) == [1, 3, 4]
assert without_none_values((1, None, 3, 4)) == (1, 3, 4)
assert without_none_values({"one": 1, "none": None, "three": 3, "four": 4}) == {
"one": 1,
"three": 3,
"four": 4,
}
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