python Programming Glossary: join

http://stackoverflow.com/questions/10715965/add-one-row-in-a-pandas-dataframe

How can I profile a SQLAlchemy powered application?

http://stackoverflow.com/questions/1171166/how-can-i-profile-a-sqlalchemy-powered-application

could be better organized into much fewer queries via joins. When using the SQLAlchemy ORM the eager loading feature is.. this activity but without the ORM it just means to use joins so that results across multiple tables can be loaded in one.. expected a cartesian product as a result of an incomplete join can cause this issue. Yet another issue is time spent within..

Python string 'join' is faster(?) than '+', but what's wrong here?

http://stackoverflow.com/questions/1349311/python-string-join-is-faster-than-but-whats-wrong-here

string 'join' is faster than ' ' but what's wrong here I asked the most.. in an earlier post and I was suggested to use the join method the best simplest and fastest method to do so as everyone.. 100 # Other codes here... s.append abcdefg i 7 return ''.join s def y s '' for i in range 100 # Other codes here... s abcdefg..

pandas: How do I split text in a column into multiple columns?

http://stackoverflow.com/questions/17116814/pandas-how-do-i-split-text-in-a-column-into-multiple-columns

df's index In 46 s.name 'Seatblocks' # needs a name to join In 47 s Out 47 0 2 218 10 4 6 1 1 13 36 1 12 1 1 13 37 1 13.. Seatblocks dtype object In 48 del df 'Seatblocks' In 49 df.join s Out 49 CustNum CustomerName ItemQty Item ItemExt Seatblocks.. each colon separated string in its own column In 50 df.join s.apply lambda x Series x.split ' ' Out 50 CustNum CustomerName..

python random string generation with upper case letters and digits

http://stackoverflow.com/questions/2257441/python-random-string-generation-with-upper-case-letters-and-digits

share improve this question Answer in one line ''.join random.choice string.ascii_uppercase string.digits for x in.. 6 chars string.ascii_uppercase string.digits ... return ''.join random.choice chars for x in range size ... id_generator 'G5G74W'.. 'abcde' for x in range 3 'd' 'a' 'c' Then we just join them with an empty string so the sequence becomes a string ''.join..

How slow is Python's string concatenation vs. str.join?

http://stackoverflow.com/questions/3055477/how-slow-is-pythons-string-concatenation-vs-str-join

slow is Python's string concatenation vs. str.join As a result of the comments in my answer on this thread I wanted.. what the speed difference is between the operator and ''.join So what is the speed comparison between the two python string.. num in xrange loop_count str_list.append `num` return ''.join str_list Now I realise they are not strictly representative..

How to list all files of a directory in Python

http://stackoverflow.com/questions/3207219/how-to-list-all-files-of-a-directory-in-python

os.path from os import listdir from os.path import isfile join onlyfiles f for f in listdir mypath if isfile join mypath f.. isfile join onlyfiles f for f in listdir mypath if isfile join mypath f or you could use os.walk which will yield 2 lists for..

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

it to exit and wait for the thread to exit properly using join . The thread should check the stop flag at regular intervals...

How can I speed up fetching pages with urllib2 in python?

http://stackoverflow.com/questions/3490173/how-can-i-speed-up-fetching-pages-with-urllib2-in-python

in args_list for t in threads t.start for t in threads t.join return result def dummy_task n for i in xrange n time.sleep.. of them do active polling to wait for the code to finish. join is a better way to synchronize the code. I think this code has..

Embedding Python in an iPhone app

http://stackoverflow.com/questions/3691655/embedding-python-in-an-iphone-app

googling about it might be useful . Also you might want to join the pyobjc dev list. While you aren't targeting a PyObjC based..

Python/Matplotlib - Is there a way to make a discontinuous axis?

http://stackoverflow.com/questions/5656798/python-matplotlib-is-there-a-way-to-make-a-discontinuous-axis

so I'm wondering if it's even possible. I know you can join data over a discontinuity for eg financial data but I'd like..

join list of lists in python

http://stackoverflow.com/questions/716477/join-list-of-lists-in-python

list of lists in python Is the a short syntax for joining a.. list of lists in python Is the a short syntax for joining a list of lists into a single list or iterator in python..

list comprehension without [ ], Python

http://stackoverflow.com/questions/9060653/list-comprehension-without-python

comprehension without Python Here is the thing join a list ''.join str _ for _ in xrange 10 '0123456789' join must.. without Python Here is the thing join a list ''.join str _ for _ in xrange 10 '0123456789' join must take an iteratable... join a list ''.join str _ for _ in xrange 10 '0123456789' join must take an iteratable. Apparently join 's argument is str..

Why is the same SQLite query being 30 times slower when fetching only twice as many results?

http://stackoverflow.com/questions/10531898/why-is-the-same-sqlite-query-being-30-times-slower-when-fetching-only-twice-as-m

feature_table_id FROM `MSMS_precursor` INNER JOIN `spectrum` ON spectrum.spectrum_id MSMS_precursor.spectrum_spectrum_id.. MSMS_precursor.spectrum_spectrum_id INNER JOIN `feature` ON feature.msrun_msrun_id spectrum.msrun_msrun_id.. feature_table_id FROM `MSMS_precursor` INNER JOIN `spectrum` ON spectrum.spectrum_id MSMS_precursor.spectrum_spectrum_id..

Python with MS SQL - truncated output

http://stackoverflow.com/questions/11882910/python-with-ms-sql-truncated-output

Req.DocumentID FROM CurMKS..ALM_Requirement Req JOIN CurMKS..ALM_SharedRequirement ShReq ON Req. References ShReq.ID.. Req.DocumentID FROM CurMKS..ALM_Requirement Req JOIN CurMKS..ALM_SharedRequirement ShReq ON Req. References ShReq.ID..

matplotlib: how to prevent x-axis labels from overlapping each other

http://stackoverflow.com/questions/13515471/matplotlib-how-to-prevent-x-axis-labels-from-overlapping-each-other

date interval '1 day' date AS day FROM mytable t s LEFT JOIN mytable t ON t.date_from date s.day GROUP BY month ORDER BY..

Is it possible to store Python class objects in SQLite?

http://stackoverflow.com/questions/2047814/is-it-possible-to-store-python-class-objects-in-sqlite

all. There are also a lot of cool features like automatic JOIN s polymorphing... A quick simple example you can run from sqlalchemy..

Python String Formats with SQL Wildcards and LIKE

http://stackoverflow.com/questions/3134691/python-string-formats-with-sql-wildcards-and-like

tag.userId count user.id as totalRows FROM user INNER JOIN tag ON user.id tag.userId WHERE user.username LIKE ' s ' query.. tag.userId count user.id as totalRows FROM user INNER JOIN tag ON user.id tag.userId WHERE user.username LIKE ' s ' query.. tag.userId count user.id as totalRows FROM user INNER JOIN tag ON user.id tag.userId WHERE user.username like This correctly..

'METHODNAME' as Client method versus irc_'METHODNAME' in twisted

http://stackoverflow.com/questions/3153666/methodname-as-client-method-versus-irc-methodname-in-twisted

'irc_PRIVMSG' As another example consider 'join' and 'irc_JOIN' What I want to know is why the redundancy those are just two.. server is sending the client lines like PRIVMSG ... and JOIN ... this results in IRCClient looking up methods like irc_PRIVMSG.. in IRCClient looking up methods like irc_PRIVMSG and irc_JOIN . These irc_ methods are just called with the split up but otherwise..

SQLAlchemy ordering by count on a many to many relationship

http://stackoverflow.com/questions/5973553/sqlalchemy-ordering-by-count-on-a-many-to-many-relationship

SELECT p. COUNT l.`pid` as `likes` FROM `posts` as p LEFT JOIN `like` as l ON p.`id` l.`pid` GROUP BY p.`id` ORDER BY `likes`..

SQLAlchemy - INSERT OR REPLACE equivalent

http://stackoverflow.com/questions/708762/sqlalchemy-insert-or-replace-equivalent

A third solution is to write your INSERT with an OUTER JOIN and a WHERE clause that filters on the rows with nulls. share..

How to debug: Internal Error current transaction is aborted, commands ignored until end of transaction block

http://stackoverflow.com/questions/9064018/how-to-debug-internal-error-current-transaction-is-aborted-commands-ignored-un

tagging_tag .id tagging_tag .name FROM tagging_tag INNER JOIN tagging_taggeditem ON tagging_tag .id tagging_taggeditem .tag_id.. ON tagging_tag .id tagging_taggeditem .tag_id INNER JOIN charfield_autocomplete_taggable ON tagging_taggeditem .object_id..