为什么这个简单布尔逻辑的 pytest 失败了?

why is this pytest of simple boolean logic failing?

我不明白为什么我对以下函数的 pytest 没有通过:

solutions/_and.py

def _and(a, b):
    if a:
        return b
    return False

test_and.py

_and_path='./solutions/'
import itertools
import sys
sys.path.append(_and_path)
print(sys.path)
import _and


def test_and():
    for i, j in itertools.product([True, False], [True, False]):
        assert(_and._and(i, j) == i and j)

失败报告:

pytest
================================================= test session starts =================================================
platform win32 -- Python 3.6.4, pytest-5.2.4, py-1.8.0, pluggy-0.13.0
rootdir: C:\Users\Joseph\projects\byoc
collected 2 items

test_and.py .F                                                                                                   [100%]

====================================================== FAILURES =======================================================
______________________________________________________ test_and _______________________________________________________

    def test_and():
        for i, j in itertools.product([True, False], [True, False]):
>           assert(_and._and(i, j) == i and j)
E           assert (False == True)
E            +  where False = <function _and at 0x000001F2A5ED7BF8>(True, False)
E            +    where <function _and at 0x000001F2A5ED7BF8> = _and._and

test_and.py:14: AssertionError
============================================= 1 failed, 1 passed in 0.08s =============================================

我是 Pytest 的新手,但在我看来,当 (True, False) 是其参数时,我的 and 版本返回 False,但 i and j 来自测试返回具有相同参数的 True。我错过了什么吗?

您需要使用括号:

True and False == True and False # means True and (False == True) and False
Out[3]: False

(True and False) == (True and False)
Out[4]: True