Messages in this thread | | | Subject | Re: [PATCH v2] kernel-doc: rename the kernel-doc directive 'functions' to 'identifiers' | From | Markus Heiser <> | Date | Tue, 29 Oct 2019 06:42:46 +0100 |
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Am 29.10.19 um 01:31 schrieb Changbin Du: >> But is it, really? I agree with Jon about the distinction between None >> and '' being confusing. >> > Here python is different from C. Both empty string and None are False in python. > Note such condition is common in python.
The one is a empty string str(''), its bool('') value is False.
| >>> type(''), bool('') | (<class 'str'>, False)
The other is a NoneType, its bool(None) value is False.
| >>> type(None), bool(None) | (<class 'NoneType'>, False)
None often used like NULL (pointer). E.g if a function does not give an explicit return value, the returned value is None.
| >>> def foo(): | ... pass | ... | >>> print(foo()) | None
-- Markus --
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