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python Programming Glossary: createWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python soon as you use the keyword class Python executes it and creates an OBJECT. The instruction class ObjectCreator object ... pass.. The instruction class ObjectCreator object ... pass ... creates in memory an object with the name ObjectCreator . This object.. classes dynamically Since classes are objects you can create them on the fly like any object. First you can create a class..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained And before generators come iterables. Iterables When you create a list you can read its items one by one and it's called iteration.. is an iterable. When you use a list comprehension you create a list and so an iterable mylist x x for x in range 3 for i.. return except the function will return a generator. def createGenerator ... mylist range 3 ... for i in mylist ... yield i..
Using the Python NLTK (2.0b5) on the Google App Engine http://stackoverflow.com/questions/1286301/using-the-python-nltk-2-0b5-on-the-google-app-engine and place it as a sub folder in my project folder. Create a python module in the folder that contains the nltk sub folder..
How to install MySQLdb (Python data access library to MySQL) on Mac OS X? http://stackoverflow.com/questions/1448429/how-to-install-mysqldb-python-data-access-library-to-mysql-on-mac-os-x MySQLdb community seem to have fixed this bug now. Step 5 Create a symbolic link under lib to point to a sub directory called..
Wrapping a C library in Python: C, Cython or ctypes? http://stackoverflow.com/questions/1942298/wrapping-a-c-library-in-python-c-cython-or-ctypes are relevant to my case. As I see it I have three choices Create an actual extension module in C. Probably overkill and I'd also..
What do (lambda) function closures capture in Python? http://stackoverflow.com/questions/2295290/what-do-lambda-function-closures-capture-in-python equivalent way is the one recommended by Adrien Plisson. Create a lambda with an extra argument and set the extra argument's..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained than two values the left and the right children Caller # Create an empty list and a list with the current object reference result..
Create directory if it doesn't exist for file write http://stackoverflow.com/questions/273192/create-directory-if-it-doesnt-exist-for-file-write directory if it doesn't exist for file write What's the most..
What's the proper way to install pip, virtualenv, and distribute for Python? http://stackoverflow.com/questions/4324558/whats-the-proper-way-to-install-pip-virtualenv-and-distribute-for-python VERSION.tar.gz tar xzf virtualenv VERSION.tar.gz # Create the first bootstrap environment. PYTHON virtualenv VERSION virtualenv.py.. you can use your bootstrap environment to create more # Create a second environment from the first INITIAL_ENV bin virtualenv.. bin virtualenv no site packages distribute py env1 # Create more INITIAL_ENV bin virtualenv py env2 Go nuts Update The flags..
Is there a matplotlib equivalent of MATLAB's datacursormode? http://stackoverflow.com/questions/4652439/is-there-a-matplotlib-equivalent-of-matlabs-datacursormode offsets 20 20 template 'x 0.2f ny 0.2f' display_all False Create the data cursor and connect it to the relevant figure. artists..
http://stackoverflow.com/questions/5276967/python-in-xcode-4-or-xcode-5 and which python . Choose where to save it and click Create . In the menu bar click File New New File . Select Other under..
How do I prevent Python's urllib(2) from following a redirect http://stackoverflow.com/questions/554446/how-do-i-prevent-pythons-urllib2-from-following-a-redirect your own HTTPRedirectHandler that intercepts each redirect Create an instance of HTTPCookieProcessor and install that opener so..
Django - Set Up A Scheduled Job? http://stackoverflow.com/questions/573618/django-set-up-a-scheduled-job One solution that I have employed is to do this 1 Create a custom management command e.g. python manage.py my_cool_command..
Using MultipartPostHandler to POST form-data with Python http://stackoverflow.com/questions/680305/using-multipartposthandler-to-post-form-data-with-python datagen headers multipart_encode image1 open DSC0001.jpg # Create the Request object request urllib2.Request http localhost 5000..
Use numpy array in shared memory for multiprocessing http://stackoverflow.com/questions/7894791/use-numpy-array-in-shared-memory-for-multiprocessing import scipy def f a a 0 a 0 if __name__ '__main__' # Create the array N int 10 unshared_arr scipy.rand N a Array 'd' unshared_arr.. print Originally the first two elements of arr s arr 2 # Create start and finish the child process p Process target f args a..
Sending HTML email using Python http://stackoverflow.com/questions/882712/sending-html-email-using-python email address me my@email.com you your@email.com # Create message container the correct MIME type is multipart alternative... msg 'Subject' Link msg 'From' me msg 'To' you # Create the body of the message a plain text and an HTML version . text..
How do you reload a Django model module using the interactive interpreter via “manage.py shell”? http://stackoverflow.com/questions/890924/how-do-you-reload-a-django-model-module-using-the-interactive-interpreter-via-m import the polls app into it. import polls.models as pm Create a new Poll object p pm.Poll All is well and good so far. Now..
Why is SQLAlchemy insert with sqlite 25 times slower than using sqlite3 directly? http://stackoverflow.com/questions/11769366/why-is-sqlalchemy-insert-with-sqlite-25-times-slower-than-using-sqlite3-directly c.execute DROP TABLE IF EXISTS customer c.execute CREATE TABLE customer id INTEGER NOT NULL name VARCHAR 255 PRIMARY.. c.execute DROP TABLE IF EXISTS customer c.execute CREATE TABLE customer id INTEGER NOT NULL name VARCHAR 255 PRIMARY..
Importing a CSV file into a sqlite3 database table using Python http://stackoverflow.com/questions/2887878/importing-a-csv-file-into-a-sqlite3-database-table-using-python con sqlite3.connect memory cur con.cursor cur.execute CREATE TABLE t col1 col2 with open 'data.csv' 'rb' as fin # `with`..
http://stackoverflow.com/questions/3247183/variable-table-name-in-sqlite I know what to do. Currently I'm doing this cursor.execute CREATE TABLE StarFrame self.name etc etc This works but I would like.. but I would like to do something more like cursor.execute CREATE TABLE StarFrame etc etc self.name though I understand that this.. though I would settle for something like cursor.execute CREATE TABLE etc etc self.name If this is not at all possible I'll..
http://stackoverflow.com/questions/3382234/python-adds-e-to-string adds &ldquo E&rdquo to string This string CREATE USER s PASSWORD s user pw always gets expanded to CREATE USER.. CREATE USER s PASSWORD s user pw always gets expanded to CREATE USER E'someuser' PASSWORD E'somepassword' Can anyone tell me.. python strings the function gets as parameter cur.execute CREATE USER s PASSWORD s user pw conn.commit python postgresql psycopg..
Executing “SELECT … WHERE … IN …” using MySQLdb http://stackoverflow.com/questions/4574609/executing-select-where-in-using-mysqldb IF EXISTS foo Query OK 0 rows affected 0.00 sec mysql CREATE TABLE `foo` `fooid` int 11 NOT NULL AUTO_INCREMENT `bar` varchar..
Running shell command from python and capturing the output http://stackoverflow.com/questions/4760215/running-shell-command-from-python-and-capturing-the-output pmysqladmin12' # should output something like # mysqladmin CREATE DATABASE failed error 'Can't create database 'test' database..
How do you escape strings for SQLite table/column names in Python? http://stackoverflow.com/questions/6514274/how-do-you-escape-strings-for-sqlite-table-column-names-in-python sqlite3.connect memory as connection connection.execute CREATE TABLE foo bar connection.execute INSERT INTO foo bar VALUES.. sqlite3.connect memory as connection connection.execute CREATE TABLE foo bar # raises sqlite3.OperationalError near syntax..
Python & MySql: Unicode and Encoding http://stackoverflow.com/questions/8365660/python-mysql-unicode-and-encoding I handle it from python side Here is my table structure CREATE TABLE yahoo_questions question_id varchar 40 NOT NULL question_subj..
Complex foreign key constraint in SQLAlchemy http://stackoverflow.com/questions/8394177/complex-foreign-key-constraint-in-sqlalchemy demo. Temporary tables so you can easily play with it CREATE TEMP TABLE systemvariables variable_id integer PRIMARY KEY variable.. variable_id variable VALUES 1 'var1' 2 'var2' 3 'var3' CREATE TEMP TABLE variableoptions option_id integer PRIMARY KEY option.. and so did PostgreSQL deferrable foreign key constraints . CREATE TEMP TABLE systemvariables variable_id integer PRIMARY KEY variable..
Optimizing performance of Postgresql database writes in Django? http://stackoverflow.com/questions/9423539/optimizing-performance-of-postgresql-database-writes-in-django pg_total_relation_size 'tmp_x' Create the temporary table CREATE TEMP TABLE tmp_x id int val_a int val_b text Or to just duplicate.. Or to just duplicate the structure of an existing table CREATE TEMP TABLE tmp_x AS SELECT FROM tbl LIMIT 0 Copy values should..
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