pylint and pep8

I've spend some time analyzing Django code. Maybe because I return to python with a huge experience in C#, but I find a Django code really messy. Classes, methods are big, many examples of violation of SOLID rules, and so on. I decided to test it against typical code analysis tools for python - pylint and pep8. Below are some results. By the way there is also django-lint - unfortunately not available via pip.

pylint db\models\query.py
...

Messages by category
--------------------

+-----------+-------+---------+-----------+
|type       |number |previous |difference |
+===========+=======+=========+===========+
|convention |85     |NC       |NC         |
+-----------+-------+---------+-----------+
|refactor   |26     |NC       |NC         |
+-----------+-------+---------+-----------+
|warning    |98     |NC       |NC         |
+-----------+-------+---------+-----------+
|error      |22     |NC       |NC         |
+-----------+-------+---------+-----------+

...
Global evaluation
-----------------
Your code has been rated at 6.52/10

pep8 db\models\query.py
db\models\query.py:12:5: E128 continuation line under-indented for visual indent
db\models\query.py:28:1: E302 expected 2 blank lines, found 1
db\models\query.py:53:14: E231 missing whitespace after ','
db\models\query.py:54:29: E231 missing whitespace after ','
db\models\query.py:174:17: E127 continuation line over-indented for visual indent
db\models\query.py:269:80: E501 line too long (83 > 79 characters)
db\models\query.py:290:80: E501 line too long (81 > 79 characters)
db\models\query.py:315:50: E225 missing whitespace around operator
db\models\query.py:328:80: E501 line too long (88 > 79 characters)
db\models\query.py:336:17: E128 continuation line under-indented for visual indent
db\models\query.py:366:21: E128 continuation line under-indented for visual indent
db\models\query.py:367:80: E501 line too long (127 > 79 characters)
db\models\query.py:368:17: E128 continuation line under-indented for visual indent
db\models\query.py:408:80: E501 line too long (90 > 79 characters)
db\models\query.py:409:17: E125 continuation line does not distinguish itself from next logical line
db\models\query.py:410:80: E501 line too long (84 > 79 characters)
db\models\query.py:412:80: E501 line too long (87 > 79 characters)
db\models\query.py:414:80: E501 line too long (96 > 79 characters)
db\models\query.py:416:80: E501 line too long (144 > 79 characters)
db\models\query.py:434:17: E127 continuation line over-indented for visual indent
db\models\query.py:445:80: E501 line too long (83 > 79 characters)
db\models\query.py:467:80: E501 line too long (113 > 79 characters)
db\models\query.py:469:17: E127 continuation line over-indented for visual indent
db\models\query.py:482:17: E127 continuation line over-indented for visual indent
db\models\query.py:495:17: E127 continuation line over-indented for visual indent
db\models\query.py:523:17: E127 continuation line over-indented for visual indent
db\models\query.py:553:17: E127 continuation line over-indented for visual indent
db\models\query.py:567:80: E501 line too long (84 > 79 characters)
db\models\query.py:581:21: E128 continuation line under-indented for visual indent
db\models\query.py:583:80: E501 line too long (103 > 79 characters)
db\models\query.py:585:17: E128 continuation line under-indented for visual indent
db\models\query.py:593:17: E127 continuation line over-indented for visual indent
db\models\query.py:595:17: E127 continuation line over-indented for visual indent
db\models\query.py:597:17: E128 continuation line under-indented for visual indent
db\models\query.py:633:21: E127 continuation line over-indented for visual indent
db\models\query.py:680:80: E501 line too long (80 > 79 characters)
db\models\query.py:681:21: E128 continuation line under-indented for visual indent
db\models\query.py:685:80: E501 line too long (90 > 79 characters)
db\models\query.py:699:80: E501 line too long (80 > 79 characters)
db\models\query.py:724:80: E501 line too long (80 > 79 characters)
db\models\query.py:734:80: E501 line too long (81 > 79 characters)
db\models\query.py:735:21: E128 continuation line under-indented for visual indent
db\models\query.py:744:17: E128 continuation line under-indented for visual indent
db\models\query.py:753:17: E127 continuation line over-indented for visual indent
db\models\query.py:764:17: E127 continuation line over-indented for visual indent
db\models\query.py:775:17: E127 continuation line over-indented for visual indent
db\models\query.py:777:80: E501 line too long (85 > 79 characters)
db\models\query.py:903:80: E501 line too long (85 > 79 characters)
db\models\query.py:920:80: E501 line too long (80 > 79 characters)
db\models\query.py:1013:80: E501 line too long (93 > 79 characters)
db\models\query.py:1014:21: E128 continuation line under-indented for visual indent
db\models\query.py:1018:80: E501 line too long (85 > 79 characters)
db\models\query.py:1039:21: E128 continuation line under-indented for visual indent
db\models\query.py:1043:80: E501 line too long (80 > 79 characters)
db\models\query.py:1054:21: E128 continuation line under-indented for visual indent
db\models\query.py:1079:80: E501 line too long (102 > 79 characters)
db\models\query.py:1201:17: E127 continuation line over-indented for visual indent
db\models\query.py:1240:1: E302 expected 2 blank lines, found 1
db\models\query.py:1245:80: E501 line too long (80 > 79 characters)
db\models\query.py:1303:80: E501 line too long (83 > 79 characters)
db\models\query.py:1304:80: E501 line too long (89 > 79 characters)
db\models\query.py:1305:80: E501 line too long (82 > 79 characters)
db\models\query.py:1307:80: E501 line too long (83 > 79 characters)
db\models\query.py:1323:80: E501 line too long (93 > 79 characters)
db\models\query.py:1323:91: E225 missing whitespace around operator
db\models\query.py:1330:80: E501 line too long (103 > 79 characters)
db\models\query.py:1332:80: E501 line too long (96 > 79 characters)
db\models\query.py:1333:80: E501 line too long (97 > 79 characters)
db\models\query.py:1332:94: E225 missing whitespace around operator
db\models\query.py:1336:80: E501 line too long (82 > 79 characters)
db\models\query.py:1359:80: E501 line too long (88 > 79 characters)
db\models\query.py:1361:29: E203 whitespace before ':'
db\models\query.py:1418:80: E501 line too long (82 > 79 characters)
db\models\query.py:1420:80: E501 line too long (92 > 79 characters)
db\models\query.py:1425:80: E501 line too long (85 > 79 characters)
db\models\query.py:1426:80: E501 line too long (88 > 79 characters)
db\models\query.py:1439:9: E128 continuation line under-indented for visual indent
db\models\query.py:1439:9: E125 continuation line does not distinguish itself from next logical line
db\models\query.py:1443:80: E501 line too long (87 > 79 characters)
db\models\query.py:1449:80: E501 line too long (80 > 79 characters)
db\models\query.py:1485:80: E501 line too long (81 > 79 characters)
db\models\query.py:1489:80: E501 line too long (82 > 79 characters)
db\models\query.py:1527:80: E501 line too long (84 > 79 characters)
db\models\query.py:1530:17: E128 continuation line under-indented for visual indent
db\models\query.py:1531:17: E128 continuation line under-indented for visual indent
db\models\query.py:1532:17: E128 continuation line under-indented for visual indent
db\models\query.py:1589:15: E261 at least two spaces before inline comment
db\models\query.py:1596:25: E261 at least two spaces before inline comment
db\models\query.py:1599:22: E261 at least two spaces before inline comment
db\models\query.py:1600:33: E261 at least two spaces before inline comment
db\models\query.py:1639:80: E501 line too long (83 > 79 characters)
db\models\query.py:1640:80: E501 line too long (83 > 79 characters)
db\models\query.py:1642:80: E501 line too long (92 > 79 characters)
db\models\query.py:1645:80: E501 line too long (89 > 79 characters)
db\models\query.py:1647:80: E501 line too long (82 > 79 characters)
db\models\query.py:1653:80: E501 line too long (81 > 79 characters)
db\models\query.py:1654:80: E501 line too long (81 > 79 characters)
db\models\query.py:1659:63: E225 missing whitespace around operator
db\models\query.py:1663:80: E501 line too long (93 > 79 characters)
db\models\query.py:1722:80: E501 line too long (80 > 79 characters)
db\models\query.py:1745:80: E501 line too long (83 > 79 characters)
db\models\query.py:1757:80: E501 line too long (81 > 79 characters)
db\models\query.py:1788:80: E501 line too long (82 > 79 characters)

Not so bad, after all we are investigating a file that has almost 2000 lines (many comments). Analysis of different classes in average gives more or less same results. The bigger the class the worst results.

Python and a GIL

I run recently into a very nice article that describes in an excellent way of what a GIL is and what it is not. So if you, as me run in to many GIL battles in your life, it is a good read. One thing to add, traditionally threads were introduced to do a parallel IO not a parallel computation, keep that in mind.

UTF8 support under Windows in SublimeText2

SublimeText2 has a great problem with guessing encoding under Windows system. It tries to use CP1252 instead of CP1250 (for my locals:)) by default. I strongly suggest installing a package manager for SublimeText2. And then installing a encoding helper plugin. I also recommend (If you are a Central-European nation) changing a fallback_encoding property in: Preferences->Settings- Default to a Central European (Windows 1250).

A list of possible values:
st_encodings_list = [
   "UTF-8",
   "UTF-8 with BOM",
   "UTF-16 LE",
   "UTF-16 LE with BOM",
   "UTF-16 BE",
   "UTF-16 BE with BOM",
   "Western (Windows 1252)",
   "Western (ISO 8859-1)",
   "Western (ISO 8859-3)",
   "Western (ISO 8859-15)",
   "Western (Mac Roman)",
   "DOS (CP 437)",
   "Arabic (Windows 1256)",
   "Arabic (ISO 8859-6)",
   "Baltic (Windows 1257)",
   "Baltic (ISO 8859-4)",
   "Celtic (ISO 8859-14)",
   "Central European (Windows 1250)",
   "Central European (ISO 8859-2)",
   "Cyrillic (Windows 1251)",
   "Cyrillic (Windows 866)",
   "Cyrillic (ISO 8859-5)",
   "Cyrillic (KOI8-R)",
   "Cyrillic (KOI8-U)",
   "Estonian (ISO 8859-13)",
   "Greek (Windows 1253)",
   "Greek (ISO 8859-7)",
   "Hebrew (Windows 1255)",
   "Hebrew (ISO 8859-8)",
   "Nordic (ISO 8859-10)",
   "Romanian (ISO 8859-16)",
   "Turkish (Windows 1254)",
   "Turkish (ISO 8859-9)",
   "Vietnamese (Windows 1258)",
   "Hexadecimal"
]

A good approximation of pi

Ah, yes, a really nice article about a Pi approximation.

PowerShell sending requests

From time to time, I have to generate a request to some web service for each element from a database. From a db I tend to generate a PowerShell commands to send a request:

$page = (New-Object System.Net.WebClient).DownloadString("http://localhost/")

And if one needs to know what was returned

Write-Host "$page"

Using PowerShell

I still keep using Unix tools underneath my GNU Emacs on windows, tools, like grep, sort, find. But, they need a configuration, and on Windows, they face specific problems :) On SO, there is a nice list of PoSh cmdlets that are an excellent replacement for my typical tasks.

The next JavaScript issue

This site becomes my diary of JavaScript problems that I fall into, or am aware of. The newest one is the infinity. In other words what is a result of:

parseInt(1 / 0, 19)

And why it is 18.