From: Markus Heiser <markus.heiser@darmarit.de>
To: Changbin Du <changbin.du@gmail.com>,
Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>,
linux-pci@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-crypto@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-wireless@vger.kernel.org, linux-fpga@vger.kernel.org,
linux-usb@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org,
Matthew Wilcox <willy@infradead.org>,
Thomas Zimmermann <tzimmermann@suse.de>
Subject: Re: [PATCH v2] kernel-doc: rename the kernel-doc directive 'functions' to 'identifiers'
Date: Tue, 29 Oct 2019 06:42:46 +0100 [thread overview]
Message-ID: <36c4dcfb-5425-b4bc-a5e9-4fd1458c8385@darmarit.de> (raw)
In-Reply-To: <20191029003120.llve32crfw63ovpw@mail.google.com>
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 --
next prev parent reply other threads:[~2019-10-29 5:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-20 13:17 [PATCH v2] kernel-doc: rename the kernel-doc directive 'functions' to 'identifiers' Changbin Du
2019-10-24 18:19 ` Jonathan Corbet
2019-10-25 6:57 ` Jani Nikula
2019-10-25 14:48 ` Changbin Du
2019-10-28 9:24 ` Jani Nikula
2019-10-29 0:31 ` Changbin Du
2019-10-29 5:42 ` Markus Heiser [this message]
2019-10-29 8:00 ` Jonathan Corbet
2019-10-31 13:50 ` Changbin Du
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