How can I get pyflakes to run on Windows?

Having trouble getting pyflakes to run on windows.

On Windows there is no apt install , so... what to do?

Solution

I downloaded the pyflakes tgz file (v0.5.0) from Pypi, and was able to unpack it with a tar tool.

Now I had a directory that looked like this:

C:\temp>dir pyflakes-0.5.0
 Volume in drive C has no label.
 Volume Serial Number is A421-40B4

 Directory of C:\temp\pyflakes-0.5.0

07/11/2012  06:28 PM    <DIR>          .
07/11/2012  06:28 PM    <DIR>          ..
09/03/2011  10:09 AM    <DIR>          bin
07/11/2012  06:28 PM    <DIR>          build
09/03/2011  09:02 AM             1,057 LICENSE
09/03/2011  09:02 AM             1,696 NEWS.txt
09/03/2011  10:09 AM               763 PKG-INFO
09/03/2011  10:09 AM    <DIR>          pyflakes
09/03/2011  09:30 AM             1,075 setup.py
               4 File(s)          4,591 bytes
               5 Dir(s)  74,326,130,688 bytes free

Next I tried the obvious: run the setup.py file. It told me to use install, so

\python27\python.exe setup.py install

That gave me a happy message about building and installing the module, culminating in

 Writing C:\Python27\Lib\site-packages\pyflakes-0.5.0-py2.7.egg-info

ok, now ...

(dinner break)

now, the install of pyflakes puts a file called "pyflakes" into c:\Python27\Scripts.

To run the pyflakes checker, use this:

\Python27\python.exe \Python27\Scripts\pyflakes myfile.py

That's it! It works.

But there is more to the story. The contents of the file c:\Python27\Scripts\pyflakes is python source code. Now, you may think, what's the deal with a python module with no .py extension? Other files in that directory are correctly marked with the .py extension. It just feels wrong to leave the extension off. Why would they do that? If you get creative and rename that file called "pyflakes" to "pyflakes.py", and then try to run that, you will get this error:

C:\dev\python>\Python27\python.exe \Python27\Scripts\pyflakes.py import1.py
Traceback (most recent call last):
  File "\Python27\Scripts\pyflakes.py", line 3, in <module>
    from pyflakes.scripts.pyflakes import main
  File "C:\Python27\Scripts\pyflakes.py", line 3, in <module>
    from pyflakes.scripts.pyflakes import main
ImportError: No module named scripts.pyflakes

The problem is a naming clash between the (renamed) pyflakes.py file, and the module that it imports, which is located at c:\Python27\Lib\site-packages\pyflakes. So, don't rename it that way. If you insist on having a .py extension, then choose something other than pyflakes.py for the name - for example, pyflakes_driver.py works just fine. Some people use runpyflakes.py .

If you do run into the problem described above, you also need to remove the pyflakes.pyc that may have been created in the c:\Python27\Scripts directory.

People might also want to create a .bat or .cmd file to launch pyflakes. To help with this I created c:\Python27\pyflakes.cmd, with these contents:

@echo off
SETLOCAL
if  _%1==_ goto USAGE
%~dp0\python.exe %~dp0\Scripts\pyflakes %*
goto ALL_DONE

:USAGE
  echo usage:  pyflakes ^<file^> [^<optionalargs^>]
  echo run the pyflakes syntax checker on a python source file.

:ALL_DONE
ENDLOCAL

ok, that's it.