¡@
python Programming Glossary: ifWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python class in a function using class def choose_class name ... if name 'foo' ... class Foo object ... pass ... return Foo # return.. class '__main__.ObjectCreator' Well type has a completely different ability it can also create classes on the fly. type can.. it's silly that the same function can have two completely different uses according to the parameters you pass to it. It's..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained node._get_child_candidates self distance min_dist max_dist if self._leftchild and distance max_dist self._median yield self._leftchild.. and distance max_dist self._median yield self._leftchild if self._rightchild and distance max_dist self._median yield self._rightchild.. candidates node candidates.pop distance node._get_dist obj if distance max_dist and distance min_dist result.extend node._values..
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 this is potentially extremely expensive. I was wondering if anyone had a good solution to this for lists of any length e.g...
http://stackoverflow.com/questions/509211/pythons-slice-notation the first value that is not in the selected slice. So the difference beween end and start is the number of elements selected.. beween end and start is the number of elements selected if step is 1 the default . The other feature is that start or end.. except the last two items Python is kind to the programmer if there are fewer items than you ask for. For example if you ask..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python a class class Foo object __metaclass__ something... ... If you do so Python will use the metaclass to create the class.. will look for __metaclass__ in the class definition. If it finds it it will use it to create the object class Foo ... finds it it will use it to create the object class Foo . If it doesn't it will use type to create the class. Read that several..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained will be called each time you use the generator object # If there is still a child of the node object on its left # AND.. distance max_dist self._median yield self._leftchild # If there is still a child of the node object on its right # AND.. distance max_dist self._median yield self._rightchild # If the function arrives here the generator will be considered empty..
Is there any way to kill a Thread in Python? http://stackoverflow.com/questions/323972/is-there-any-way-to-kill-a-thread-in-python the given exception type in the context of this thread. If the thread is busy in a system call time.sleep socket.accept.. socket.accept ... the exception is simply ignored. If you are sure that your exception should terminate the thread.. while t.isAlive time.sleep 0.1 t.raiseExc SomeException If the exception is to be caught by the thread you need a way to..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python python list comprehension share improve this question If you're just looking to iterate over a flattened version of the..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do the special __name__ variable to have a value __main__ . If this file is being imported from another module __name__ will..
Using global variables in a function other than the one that created them http://stackoverflow.com/questions/423379/using-global-variables-in-a-function-other-than-the-one-that-created-them in a function other than the one that created them If I create a global variable in one function how can I use that..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference by value some data types are mutable but others aren't So If you pass a mutable object into a method the method gets a reference.. outer reference will still point at the original object. If you pass an immutable object to a method you still can't rebind.. call it like my_string return_a_whole_new_string my_string If you really wanted to avoid using a return value you could create..
using pyodbc on ubuntu to insert a image field on SQL Server http://stackoverflow.com/questions/1060035/using-pyodbc-on-ubuntu-to-insert-a-image-field-on-sql-server con pyodbc.connect odbcstring cur con.cursor cur.execute IF EXISTS SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE.. con pyodbc.connect odbcstring cur con.cursor cur.execute IF EXISTS SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE..
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 sqlite3.connect dbname c conn.cursor c.execute DROP TABLE IF EXISTS customer c.execute CREATE TABLE customer id INTEGER NOT.. sqlite3.connect dbname c conn.cursor c.execute DROP TABLE IF EXISTS customer c.execute CREATE TABLE customer id INTEGER NOT..
Using a WHERE ___ IN ___ statement http://stackoverflow.com/questions/14245396/using-a-where-in-statement _ IN _ statement Definition c.execute '''CREATE TABLE IF NOT EXISTS tab _id integer PRIMARY KEY AUTOINCREMENT obj text..
How to extract information from ODP accurately? [closed] http://stackoverflow.com/questions/16355421/how-to-extract-information-from-odp-accurately conn cursor conn.cursor cursor.execute ''' CREATE TABLE IF NOT EXISTS odp_urls url text primary key title text description..
Python variable assignment and IF statement http://stackoverflow.com/questions/1663995/python-variable-assignment-and-if-statement variable assignment and IF statement Sorry if this is Python 101 but I don't even know..
How to delete a row from a listbox in TKinter and SQLite3 http://stackoverflow.com/questions/19738499/how-to-delete-a-row-from-a-listbox-in-tkinter-and-sqlite3 c conn.cursor conn.execute ''' CREATE TABLE IF NOT EXISTS people name TEXT primary key age TEXT phone TEXT.. self.conn.cursor # create table c.execute '''CREATE TABLE IF NOT EXISTS people name TEXT primary key age TEXT phone TEXT..
Python: Installing man pages in distutils based project http://stackoverflow.com/questions/3657209/python-installing-man-pages-in-distutils-based-project is None self.manprefix DEFAULT MAN PREFIX PATH IF THE OPTION IS NOT SET install.finalize_options self def run..
Postgres: INSERT if does not exist already http://stackoverflow.com/questions/4069718/postgres-insert-if-does-not-exist-already I've seen complex statements like this recommended IF EXISTS SELECT FROM invoices WHERE invoiceid '12345' UPDATE invoices.. INTO invoices invoiceid billed VALUES '12345' 'TRUE' END IF But firstly is this overkill for what I need and secondly how..
Open document with default application in Python http://stackoverflow.com/questions/434597/open-document-with-default-application-in-python an inherent but you can type 'filename rm rf ' problem and IF the file name can be corrupted using subprocess.call gives us..
Executing “SELECT … WHERE … IN …” using MySQLdb http://stackoverflow.com/questions/4574609/executing-select-where-in-using-mysqldb this is how the foo table was created mysql DROP TABLE IF EXISTS foo Query OK 0 rows affected 0.00 sec mysql CREATE TABLE..
Python - Check If Word Is In A String http://stackoverflow.com/questions/5319922/python-check-if-word-is-in-a-string is in the string using .find but is there a way to do an IF statement. I would like to have something like the following..
http://stackoverflow.com/questions/5942402/python-csv-to-sqlite 8 bit bytestrings cur conn.cur cur.execute 'CREATE TABLE IF NOT EXISTS mytable field2 VARCHAR field4 VARCHAR ' reader csv.reader..
Compiling Python 2.6.6 and need for external packages wxPython, setuptools, etc… in Ubuntu http://stackoverflow.com/questions/6079128/compiling-python-2-6-6-and-need-for-external-packages-wxpython-setuptools-etc TARG make install # collect binary libraries ##REDO THIS IF YOU ADD ANY ADDITIONAL MODULES## function collect_binary_libs..
Trapping MySQL Warnings In Python http://stackoverflow.com/questions/647805/trapping-mysql-warnings-in-python a warning to standard error if you submit 'DROP DATABASE IF EXISTS database_of_armaments' when no such database exists... does not exist. try cursor.execute 'DROP DATABASE IF EXISTS database_of_armaments' except WHAT DO I PUT HERE print..
Pythonic way to combine FOR loop and IF statement http://stackoverflow.com/questions/6981717/pythonic-way-to-combine-for-loop-and-if-statement way to combine FOR loop and IF statement I know how to use both for loops and if statements..
Combining 2 .csv files by common column http://stackoverflow.com/questions/826812/combining-2-csv-files-by-common-column with both its row from file 1 and its row from file 2 . IF one MPID appears only in one file then it should also go into..
|
