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python Programming Glossary: selectHow to remove convexity defects in a Sudoku square? http://stackoverflow.com/questions/10196198/how-to-remove-convexity-defects-in-a-sudoku-square For that I use connected component analysis and select the component that's got the largest convex area components.. much longer than the digits so I can use caliper length to select only the grid lines connected components. Sorting them by position..
Python subprocess readlines() hangs http://stackoverflow.com/questions/12419198/python-subprocess-readlines-hangs on @Antti Haapala's answer import os import pty import select from subprocess import Popen STDOUT master_fd slave_fd pty.openpty.. close_fds True timeout .04 # seconds while 1 ready _ _ select.select master_fd timeout if ready data os.read master_fd 512.. True timeout .04 # seconds while 1 ready _ _ select.select master_fd timeout if ready data os.read master_fd 512 if not..
“Large data” work flows using pandas http://stackoverflow.com/questions/14262433/large-data-work-flows-using-pandas create new columns by performing various operations on the selected columns. I would then have to append these new columns into.. of business say Retail credit cards. To do this I would select only those recrods where the line of business retail in addition.. operations look like. E.g. do a query on columns to select a bunch of rows and specific columns then do an operation in..
Django equivalent for count and group by http://stackoverflow.com/questions/327807/django-equivalent-for-count-and-group-by max_length 60 category models.ForeignKey Category I want select count just the count of items for each category so in SQL it.. for each category so in SQL it would be as simple as this select category_id count id from item group by category_id Is there.. a public API and could change query_set Item.objects.extra select 'count' 'count 1 ' order_by ' count' .values 'count' 'category'..
Non-blocking read on a subprocess.PIPE in python http://stackoverflow.com/questions/375427/non-blocking-read-on-a-subprocess-pipe-in-python nonblocking share improve this question fcntl select asyncproc won't help in this case. Reliable way to read a stream..
Is there a matplotlib equivalent of MATLAB's datacursormode? http://stackoverflow.com/questions/4652439/is-there-a-matplotlib-equivalent-of-matlabs-datacursormode the x y location of a matplotlib artist when it is selected. def __init__ self artists tolerance 5 offsets 20 20 template.. the matplotlib artist or sequence of artists that will be selected. tolerance is the radius in points that the mouse click must.. radius in points that the mouse click must be within to select the artist. offsets is a tuple of x y offsets in points from..
http://stackoverflow.com/questions/5276967/python-in-xcode-4-or-xcode-5 the executable and click Choose . For the Debugger field select None . In the Arguments tab click the Expand Variables Based.. tab click the Expand Variables Based On field and select the target that is named the same as your project. Click the..
http://stackoverflow.com/questions/7933596/django-dynamic-model-fields may be inefficient on some databases. You will need to select one of the forks since the official package is no longer maintained..
How can I profile a SQLAlchemy powered application? http://stackoverflow.com/questions/1171166/how-can-i-profile-a-sqlalchemy-powered-application 17 37 48 325 INFO sqlalchemy.engine.base.Engine.0x...048c SELECT ... 17 37 48 326 INFO sqlalchemy.engine.base.Engine.0x...048c..
Using a WHERE ___ IN ___ statement http://stackoverflow.com/questions/14245396/using-a-where-in-statement do something like this list_of_vars 'foo' 'bar' statement SELECT FROM tab WHERE obj IN c.execute statement ' ' ' .join list_of_vars.. tried this which directly evaluates to the above statement SELECT FROM tab WHERE obj IN c.execute statement 'foo' 'bar' The error.. as it is vulnerable to a SQL injection attack. statement SELECT FROM tab WHERE obj IN ' ' ' .join statement ' python sql sqlite..
Parameterized queries with psycopg2 / Python DB-API and PostgreSQL http://stackoverflow.com/questions/1466741/parameterized-queries-with-psycopg2-python-db-api-and-postgresql the following should be safe and work cursor.execute SELECT FROM student WHERE last_name lname s lname Robert' DROP TABLE..
Lost connection to MySQL server during query http://stackoverflow.com/questions/1884859/lost-connection-to-mysql-server-during-query cursor.execute sql return cursor # # db DB sql SELECT bla FROM foo data db.query sql for row in data do_something..
Does Python support MySQL prepared statements? http://stackoverflow.com/questions/1947750/does-python-support-mysql-prepared-statements a PHP project earlier where prepared statements made the SELECT queries 20 faster. I'm wondering if it works on Python I can't..
Escape SQL “LIKE” value for Postgres with psycopg2 http://stackoverflow.com/questions/2106207/escape-sql-like-value-for-postgres-with-psycopg2 ' ' ' ' .replace ' ' ' ' .replace '_' ' _' sql SELECT FROM things WHERE description LIKE like s ESCAPE ' ' cursor.execute..
Python: DISTINCT on GQuery result set (GQL, GAE) http://stackoverflow.com/questions/239258/python-distinct-on-gquery-result-set-gql-gae to perform the following SQL query which is not supported SELECT DISTINCT user_hash FROM links Instead you could use user db.GqlQuery.. FROM links Instead you could use user db.GqlQuery SELECT user_hash FROM links How to use Python most efficiently to filter..
Filtering by entity key name in Google App Engine on Python http://stackoverflow.com/questions/2544565/filtering-by-entity-key-name-in-google-app-engine-on-python then filter it. So for example these are equivalent gql SELECT FROM User WHERE age 18 db.GqlQuery gql and query User.all query.filter.. by key name. I know that in GQL you do it like this gql SELECT FROM User WHERE __key__ Key 'User' 'abc' db.GqlQuery gql But..
How to get a row-by-row MySQL ResultSet in python http://stackoverflow.com/questions/337479/how-to-get-a-row-by-row-mysql-resultset-in-python start_row 0 while True cursor conn.cursor cursor.execute SELECT item FROM items LIMIT d 1000 start_row rows cursor.fetchall.. db mydb cur conn.cursor print Executing query cur.execute SELECT FROM bigtable print Starting loop row cur.fetchone while row..
Getting the SQL from a Django QuerySet http://stackoverflow.com/questions/3748295/getting-the-sql-from-a-django-queryset queryset MyModel.objects.all print queryset.query SELECT myapp_mymodel . id ... FROM myapp_mymodel share improve this..
memory-efficient built-in SqlAlchemy iterator/generator? http://stackoverflow.com/questions/7389759/memory-efficient-built-in-sqlalchemy-iterator-generator regards queries that are against more than just simple SELECT statements joins to other tables which may return the same object.. of the table I want to select. I then emit individual SELECT statements that each pull from one of those windows at a time...
http://stackoverflow.com/questions/9064018/how-to-debug-internal-error-current-transaction-is-aborted-commands-ignored-un 127.0.0.1 8000 Quit the server with CONTROL C. DEBUG 0.001 SELECT django_content_type . id django_content_type . name django_content_type.. args 'taggable' 'charfield_autocomplete' DEBUG 0.000 SELECT DISTINCT tagging_tag .id tagging_tag .name FROM tagging_tag..
Total memory used by Python process? http://stackoverflow.com/questions/938733/total-memory-used-by-python-process import os from wmi import WMI w WMI '.' result w.query SELECT WorkingSet FROM Win32_PerfRawData_PerfProc_Process WHERE IDProcess..
How to remove convexity defects in a Sudoku square? http://stackoverflow.com/questions/10196198/how-to-remove-convexity-defects-in-a-sudoku-square Below is what I did Read the image Find the contours Select the one with maximum area and also somewhat equivalent to square..
How to create a DLL with SWIG from Visual Studio 2010 http://stackoverflow.com/questions/11693047/how-to-create-a-dll-with-swig-from-visual-studio-2010 Visual Studio 2010 File New Project from Existing Code... Select Visual C project type and click Next. Enter project file location.. used in module statement in your .i file case matters . Select project type Dynamically linked library DLL project and click.. . Change Item Type to Custom Build Tool and click Apply. Select Custom Build Tool in Properties it will appear after Apply above..
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 environment to create more Here is an example in bash # Select current version of virtualenv VERSION 1.6.4 # Name your first..
Using Python and Mechanize to submit form data and authenticate http://stackoverflow.com/questions/4720470/using-python-and-mechanize-to-submit-form-data-and-authenticate be navigated r br.open 'http www.reddit.com' html r.read # Select the second index one form br.select_form nr 1 # User credentials.. max_time 1 r br.open 'http www.reddit.com' # Select the second index one form br.select_form nr 1 # User credentials..
http://stackoverflow.com/questions/5276967/python-in-xcode-4-or-xcode-5 are the same. In the menu bar click File New New Project . Select Other under Mac OS X . Select External Build System and click.. click File New New Project . Select Other under Mac OS X . Select External Build System and click Next . Enter the product name.. click Create . In the menu bar click File New New File . Select Other under Mac OS X . Select Empty and click Next . Navigate..
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