整数与整数的比较或在集合或元组中的存在

Question

我遇到了一个问题，我尝试使用 or 将整数类型的变量与其他两个整数进行比较，但没有意识到这是不可能的。

原码

model = 4004

if model == 3002 or 3003:
    print("model be 300X")

elif model == 4004 or 4003:
    print("model be 400X")

else:
    print("model type not covered")

Returns

300X #什么时候应该是400X.

我还有另外两个解决方法，在我看来这两个都不是 pythonic，但它们有效。

有更好的方法吗？

工作代码

import itertools

model = 4004

if model in (3002, 3003):
    print("model be 300X")
    cycle_dict = {x: z for x, z in zip(range(1, 1001, 1), itertools.cycle(["C", "C", "A", "A", "B", "B"]))}
elif model in (4004, 4003):
    print("model be 400X")
    cycle_dict = {x: z for x, z in zip(range(1, 2001, 1), itertools.cycle(["C", "C", "C", "C", "A", "A", "A", "A", "B", "B", "B", "B"]))}
else:
    print("model type not covered")


if model == 3002:
    print("this is a 3002")
    cycle_dict = {x: z for x, z in zip(range(1, 1001, 1), itertools.cycle(["C", "C", "A", "A", "B", "B"]))}
if model == 3003:
    print("this is a 3003")
    cycle_dict = {x: z for x, z in zip(range(1, 1001, 1), itertools.cycle(["C", "C", "A", "A", "B", "B"]))}
if model == 4004:
    print("this is a 4004")
    cycle_dict = {x: z for x, z in zip(range(1, 2001, 1), itertools.cycle(["C", "C", "C", "C", "A", "A", "A", "A", "B", "B", "B", "B"]))}
if model == 4003:
    print("this is a 4003")
    cycle_dict = {x: z for x, z in zip(range(1, 2001, 1), itertools.cycle(["C", "C", "C", "C", "A", "A", "A", "A", "B", "B", "B", "B"]))}

print("cycle_dict : ", cycle_dict)

它returns一个字典

cycle_dict :  {1: 'C', 2: 'C', 3: 'C', 4: 'C', 5: 'A', 6: 'A', 7: 'A', 8: 'A', 9: 'B', 10: 'B', 11: 'B', 12: 'B', ...

Answer 1

您的初始尝试无效，因为 model == 3002 or 3003 被翻译为 (model == 3002) or 3003。第一个条件为假，但 3003 为真值。您需要明确使用 model == 3002 or model == 3003.

>>> model = 4004
>>> model == 3002 or 3003
3003
>>> bool(model == 3002 or 3003)
True
>>> model == 3002 or model == 3003
False

现在，至于用哪种方法，我比较喜欢

model in {a, b}

比元组快，因为 lookup time complexity is O(1)。如果您只有几张支票，这几乎不重要，但要记住这一点。一般来说，value in tuple 或 value in set 需要更少的击键来键入，并且其意图很明确。

根据您的基本逻辑，以下可能更好：

series = model // 1000
if series == 3:
    pass
elif series == 4:
    pass

整数与整数的比较或在集合或元组中的存在

Comparison of integer against integer or presence in a set or tuple

python

comparison

tuples

set