blocks|key|783533|text|也可以使用__import__导入。它不是蟒蛇，但烟花不再警告你了。参见documentation+for+__import__。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|783534|try:
++++import+json
except+ImportError:
++++__import__('django.utils',+globals(),+locals(),+['json'],+-1)|code-block|syntax|javascript|783535|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/library/functions.html#__import__^0|5|A|1I|A|10|S|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

You can also import with <code>__import__</code>. It's not pythonic, but pyflakes does not warn you anymore. See <a href="http://docs.python.org/library/functions.html#__import__" rel="nofollow">documentation for <code>__import__</code></a> .

<pre><code>try:
 import json
except ImportError:
 __import__('django.utils', globals(), locals(), ['json'], -1)
</code></pre>

blocks|key|783581|text|如果您可以使用flake8+-它包装了pyflakes和pep8检查器-一行结束于|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|783582|#+NOQA|style|CODE|783583|(其中的空格很重要--在代码末尾和#之间有两个空格，在它和NOQA文本之间有一个空格)将告诉检查器忽略该行上的任何错误。|783584|entityMap|0|LINK|mutability|MUTABLE|url|http://pypi.python.org/pypi/flake8^0|7|6|0|0|0|6|0|H|1|T|4|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@$A|W|B|X|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|Y|8|@$A|Z|B|10|F|G]|$A|11|B|12|F|G]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

If you can use <a href="http://pypi.python.org/pypi/flake8" rel="noreferrer">flake8</a> instead - which wraps pyflakes as well as the pep8 checker - a line ending with

<code> # NOQA</code>

(in which the space is significant - 2 spaces between the end of the code and the <code>#</code>, one between it and the <code>NOQA</code> text) will tell the checker to ignore any errors on that line.

blocks|key|998012|text|我知道这个问题在一段时间前就被质疑了，并且已经得到了回答。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|998013|但我想添加我通常使用的内容：|998014|try:
++++import+json
++++assert+json++#+silence+pyflakes
except+ImportError:
++++from+django.utils+import+simplejson+as+json++#+Python+2.4+fallback.|code-block|syntax|javascript|998015|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know this was questioned some time ago and is already answered.

But I wanted to add what I usually use:

<pre><code>try:
 import json
 assert json # silence pyflakes
except ImportError:
 from django.utils import simplejson as json # Python 2.4 fallback.
</code></pre>

blocks|key|783659|text|这是一个添加了#+bypass_pyflakes注释选项的pyflakes的猴子补丁。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|783660|bypass_pyflakes.py|783661|#!/usr/bin/env+python

from+pyflakes.scripts+import+pyflakes
from+pyflakes.checker+import+Checker


def+report_with_bypass(self,+messageClass,+*args,+**kwargs):
++++text_lineno+=+args[0]+-+1
++++with+open(self.filename,+'r')+as+code:
++++++++if+code.readlines()[text_lineno].find('bypass_pyflakes')+>=+0:
++++++++++++return
++++self.messages.append(messageClass(self.filename,+*args,+**kwargs))

#+monkey+patch+checker+to+support+bypass
Checker.report+=+report_with_bypass

pyflakes.main()|code-block|syntax|javascript|783662|如果将其另存为bypass_pyflakes.py，则可以作为python+bypass_pyflakes.py+myfile.py调用它。|783663|http://chase-seibert.github.com/blog/2013/01/11/bypass_pyflakes.html|783664|entityMap|0|LINK|mutability|MUTABLE|url^0|7|H|0|0|0|7|I|V|Z|0|0|1W|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|Q|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|P]]]]

Here is a monkey patch for pyflakes that adds a <code># bypass_pyflakes</code> comment option.

<h1>bypass_pyflakes.py</h1>

<pre><code>#!/usr/bin/env python

from pyflakes.scripts import pyflakes
from pyflakes.checker import Checker


def report_with_bypass(self, messageClass, *args, **kwargs):
 text_lineno = args[0] - 1
 with open(self.filename, 'r') as code:
 if code.readlines()[text_lineno].find('bypass_pyflakes') &gt;= 0:
 return
 self.messages.append(messageClass(self.filename, *args, **kwargs))

# monkey patch checker to support bypass
Checker.report = report_with_bypass

pyflakes.main()
</code></pre>

If you save this as <code>bypass_pyflakes.py</code>, then you can invoke it as <code>python bypass_pyflakes.py myfile.py</code>.

<a href="http://chase-seibert.github.com/blog/2013/01/11/bypass_pyflakes.html" rel="nofollow noreferrer">http://chase-seibert.github.com/blog/2013/01/11/bypass_pyflakes.html</a>

blocks|key|783710|text|我用一些awk魔法创建了一个小的shell脚本来帮助我。这样就排除了所有包含import+typing、from+typing+import或#$+(后者是我在这里使用的特殊注释)的行($1是Python脚本的文件名)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|783711|result=$(pyflakes+--+"$1"+2>&1)

#+check+whether+there+is+any+output
if+[+"$result"+];+then

++++#+lines+to+exclude
++++excl=$(awk+'BEGIN+{+ORS=""+}+/(#\$)%7C(import+%2Btyping)%7C(from+%2Btyping+%2Bimport+)/+{+print+sep+NR;+sep="%7C"+}'+"$1")

++++#+exclude+lines+if+there+are+any+(otherwise+we+get+invalid+regex)
++++[+"$excl"+]+&&
++++++++result=$(awk+"!+/%5E[%5E:]%2B:(${excl}):/"+<<<+"$result")

fi

#+now+echo+"$result"+or+such+...|code-block|syntax|javascript|783712|基本上，它记录行号并动态地创建一个正则表达式。|783713|entityMap^0|4|3|12|D|1G|I|1Z|2|2L|2|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|N|$]]

I created a little shell script with some <code>awk</code> magic to help me. With this all lines with <code>import typing</code>, <code>from typing import</code> or <code>#$</code> (latter is a special comment I am using here) are excluded (<code>$1</code> is the file name of the Python script):


<pre><code>result=$(pyflakes -- "$1" 2&gt;&amp;1)

# check whether there is any output
if [ "$result" ]; then

 # lines to exclude
 excl=$(awk 'BEGIN { ORS="" } /(#\$)|(import +typing)|(from +typing +import )/ { print sep NR; sep="|" }' "$1")

 # exclude lines if there are any (otherwise we get invalid regex)
 [ "$excl" ] &amp;&amp;
 result=$(awk "! /^[^:]+:(${excl}):/" &lt;&lt;&lt; "$result")

fi

# now echo "$result" or such ...
</code></pre>

Basically it notes the line numbers and dynamically creates a regex out it.

A lot of our modules start with:

<pre><code>try:
 import json
except ImportError:
 from django.utils import simplejson as json # Python 2.4 fallback.
</code></pre>

...and it's the only Pyflakes warning in the entire file:

<pre><code>foo/bar.py:14: redefinition of unused 'json' from line 12
</code></pre>

How can I get Pyflakes to ignore this?

(Normally I'd go read <a href="http://www.divmod.org/trac/wiki/DivmodPyflakes" rel="noreferrer">the docs</a> but the link is broken. If nobody has an answer, I'll just read the source.)

How do I get Pyflakes to ignore a statement?

Python

我们的很多模块都是这样开始的：try:    import jsonexcept ImportError:    from django.utils import simplejson as json  # Python 2.4 fallback....and这是整个文件中唯一的Pyflake警告：foo/bar.py...

问如何让Pyflake忽略某个语句？
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