Python 3 中的空字符串、空 dict、空 list、0、None 是 True ？

[biaodianfu]

>>> bool(0)
False
>>> bool("")
False
>>> bool([])
False
>>> bool({})
False
>>> bool(None)
False

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>>> 0 == False
True
>>> "" == False
False
>>> [] == False
False
>>> {} == False
False
>>> None == False
False

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PEP 8：

For sequences, (strings, lists, tuples), use the fact that empty sequences are false.

Yes: if not seq:
if seq:

No: if len(seq):
if not len(seq):