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python Programming Glossary: likeWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python Since classes are objects you can create them on the fly like any object. First you can create a class in a function using.. MyClass You've seen that type lets you do something like this MyClass type 'MyClass' It's because the function type is.. for a metaclass # remember that `type` is actually a class like `str` and `int` # so you can inherit from it class UpperAttrMetaclass..
Flatten (an irregular) list of lists in Python http://stackoverflow.com/questions/2158395/flatten-an-irregular-list-of-lists-in-python far as I know all solutions except for one fail on a list like this L 1 2 3 4 5 6 Where the desired output is 1 2 3 4 5 6 Or..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained 4 one by one. Yield Yield is a keyword that is used like return except the function will return a generator. def createGenerator.. 100 100 100 100 ... It can be useful for various things like controlling access to a resource. Itertools your best friend..
http://stackoverflow.com/questions/2709821/python-self-explained to distinguish normal names from attributes special syntax like Ruby has or requiring declarations like C and Java do or perhaps.. special syntax like Ruby has or requiring declarations like C and Java do or perhaps something yet more different but it..
How do you split a list into evenly sized chunks in Python? http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python and operate on it. There are some obvious ways to do this like keeping a counter and two lists and when the second list fills..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python to flatten a shallow list with a nested list comprehension like this image for image in menuitem.image_set.all for menuitem.. all consider to be the best way to flatten a shallow list like this balancing performance and readability. Update Thanks to.. style to avoid operator magic by using chain.from_iterable like so chain itertools.chain.from_iterable 1 2 3 5 89 6 print list..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do executing as the main function e.g. you said something like python threading_example.py on the command line. After setting..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference 'can' 'not' 'lie' print 'set to' the_list outer_list 'we' 'like' 'proper' 'English' print 'before outer_list ' outer_list try_to_change_list_reference.. outer_list ' outer_list Output before outer_list 'we' 'like' 'proper' 'English' got 'we' 'like' 'proper' 'English' set to.. before outer_list 'we' 'like' 'proper' 'English' got 'we' 'like' 'proper' 'English' set to 'and' 'we' 'can' 'not' 'lie' after..
How accurate is python's time.sleep()? http://stackoverflow.com/questions/1133857/how-accurate-is-pythons-time-sleep of that time when above the minimum 10 13ms. Update Like mentioned in the docs sited below it's common to do the sleep..
Understanding kwargs in Python http://stackoverflow.com/questions/1769403/understanding-kwargs-in-python How exactly does it work Is it classes as 'unpacking' Like a b 1 2 python kwargs share improve this question You can..
Map two lists into a dictionary in Python http://stackoverflow.com/questions/209840/map-two-lists-into-a-dictionary-in-python values python dictionary share improve this question Like this keys 'a' 'b' 'c' values 1 2 3 dictionary dict zip keys..
Python “Every Other Element” Idiom http://stackoverflow.com/questions/2631189/python-every-other-element-idiom if you're not familiar with the stride feature of ranges . Like your code it discards the last value where you have an odd number..
http://stackoverflow.com/questions/280243/python-linked-list suggested a good educational resource How to Think Like a Computer Scientist Chapter 17 Linked lists A linked list is..
Simple wrapping of C code with cython http://stackoverflow.com/questions/3046305/simple-wrapping-of-c-code-with-cython See also distutils doc and or SO questions on distutils . Like make setup.py will rerun cython f.pyx and g c ... f.cpp if f.pyx..
Check if multiple strings exist in another string http://stackoverflow.com/questions/3389574/check-if-multiple-strings-exist-in-another-string if any of the strings in an array exists in another string Like a 'a' 'b' 'c' str a123 if a in str print some of the strings..
Why does python use two underscores for certain things? http://stackoverflow.com/questions/3443043/why-does-python-use-two-underscores-for-certain-things is good so there should be a way to customize behaviour. Like operator overloading __add__ __div__ __ge__ ... attribute access..
Python coding standards/best practices [closed] http://stackoverflow.com/questions/356161/python-coding-standards-best-practices Style Guides I suggest that you refer the following Code Like a Pythonista Idiomatic Python Common mistakes and Warts How..
Should wildcard import be avoided? http://stackoverflow.com/questions/3615125/should-wildcard-import-be-avoided QtGi as Gu then use Cr.blah and Gu.zorp or the like. Like all abbreviations it's a style tradeoff between conciseness..
A weighted version of random.choice http://stackoverflow.com/questions/3679694/a-weighted-version-of-random-choice . This is what I came up with def weightedChoice choices Like random.choice but each element can have a different chance of..
Calculating Pearson correlation and significance in Python http://stackoverflow.com/questions/3949226/calculating-pearson-correlation-and-significance-in-python requires that each dataset be normally distributed. Like other correlation coefficients this one varies between 1 and..
How to clear python interpreter console? http://stackoverflow.com/questions/517970/how-to-clear-python-interpreter-console to clear python interpreter console Like most Python developers I typically keep a console window open.. running to test commands dir stuff help stuff etc. Like any console after a while the visible backlog of past commands..
Cross-platform gui toolkit for deploying Python applications http://stackoverflow.com/questions/520015/cross-platform-gui-toolkit-for-deploying-python-applications one can create an application by just using Qt classes. Like SQL networking scripting Qt used to emulate GUI elements on..
http://stackoverflow.com/questions/606448/python-design-patterns and Advanced Software Carpentry in Python Code Like a Pythonista Idiomatic Python Python Idioms and Efficiency Google..
Python multiprocessing.Pool: when to use apply, apply_async or map? http://stackoverflow.com/questions/8533318/python-multiprocessing-pool-when-to-use-apply-apply-async-or-map to block until that function returns use Pool.apply . Like Pool.apply Pool.map blocks until the complete result is returned...
http://stackoverflow.com/questions/890128/python-lambda-why this question Are you talking about lambda functions Like f lambda x x 2 2 x 5 Those things are actually quite useful... function may be the shortest way to write something out. Like def transform n return lambda x x n f transform 3 f 4 # is 7..
How to learn Python: Good Example Code? [closed] http://stackoverflow.com/questions/918/how-to-learn-python-good-example-code no substitute for looking at code but I've found Code Like a Pythonista to be useful for those kinds of questions. It has..
Partial matching GAE search API http://stackoverflow.com/questions/12899083/partial-matching-gae-search-api webapp2 share improve this question Though LIKE statement partial match is not supported in Full Text Search..
Picklable data containers that are dumpable in the current namespace http://stackoverflow.com/questions/14716727/picklable-data-containers-that-are-dumpable-in-the-current-namespace this code is ugly mainly YOU SHOULDN'T BE DOING SOMETHING LIKE THIS P and when using exec the usual warnings apply Make sure..
Escape SQL “LIKE” value for Postgres with psycopg2 http://stackoverflow.com/questions/2106207/escape-sql-like-value-for-postgres-with-psycopg2 SQL &ldquo LIKE&rdquo value for Postgres with psycopg2 Does psycopg2 have a.. Does psycopg2 have a function for escaping the value of a LIKE operand for Postgres For example I may want to match strings.. so I want to write something like this sql '... WHERE ... LIKE myvalue s' cursor.fetchall sql 'myvalue' escape_sql_like '20..
Python: Number of rows affected by cursor.execute("SELECT …) http://stackoverflow.com/questions/2511679/python-number-of-rows-affected-by-cursor-executeselect SELECT COUNT from result where server_state '2' AND name LIKE ' digest _ charset _ ' python sql rows database share improve.. SELECT COUNT from result where server_state '2' AND name LIKE ' digest _ charset _ ' result cursor.fetchone result will hold.. SELECT COUNT from result where server_state '2' AND name LIKE ' digest _ charset _ ' number_of_rows cursor.fetchone PS. It's..
Python String Formats with SQL Wildcards and LIKE http://stackoverflow.com/questions/3134691/python-string-formats-with-sql-wildcards-and-like String Formats with SQL Wildcards and LIKE I'm having a hard time getting some sql in python to correctly.. that is killing me. My sql statement is using the LIKE keyword with wildcards. I've tried a number of different things.. INNER JOIN tag ON user.id tag.userId WHERE user.username LIKE ' s ' query This is a no go. I get value error ValueError unsupported..
http://stackoverflow.com/questions/7681708/querying-full-name-in-django first_name and last_name to give a fullname then do a LIKE on that like so select fields from Users where CONCAT first_name.. fields from Users where CONCAT first_name ' ' last_name LIKE ' John Smith The above query would return all users named John.. then you can use ' contains ' which translates into a SQL LIKE. If you just need the capacity to store the name 'John Paul'..
Python & MySql: Unicode and Encoding http://stackoverflow.com/questions/8365660/python-mysql-unicode-and-encoding how the mysql variables looks like mysql SHOW variables LIKE ' character_set ' Variable_name Value character_set_client..
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