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python Programming Glossary: constraint

How do I define a unique property for a Model in Google App Engine?

http://stackoverflow.com/questions/1185628/how-do-i-define-a-unique-property-for-a-model-in-google-app-engine

share improve this question There's no built in constraint for making sure a value is unique. You can do this however query..

Override function declaration in autodoc for sphinx

http://stackoverflow.com/questions/12082570/override-function-declaration-in-autodoc-for-sphinx

How do Python comparison operators < and > work with a function name as an operand?

http://stackoverflow.com/questions/18387938/how-do-python-comparison-operators-and-work-with-a-function-name-as-an-opera

in an exception. The Python spec places some specific constraint on the behaviour in 2.x comparison by type name is not the only..

Why is ''>0 True in Python? [duplicate]

http://stackoverflow.com/questions/2384078/why-is-0-true-in-python

in Python 3 which explicitly and deliberately removed the constraint of strong backwards compatibility to allow some long desired..

Postgres: INSERT if does not exist already

http://stackoverflow.com/questions/4069718/postgres-insert-if-does-not-exist-already

duplicate key value violates unique constraint hundred_pkey How can I write an 'INSERT unless this row already..

Store jpg, gif, png, etc it gae-datastore

http://stackoverflow.com/questions/5211780/store-jpg-gif-png-etc-it-gae-datastore

no easy way to programmatically enforce a pictures only constraint. Luckily this means that you can store data of any type you..

Is there a good way to do this type of mining?

http://stackoverflow.com/questions/7076349/is-there-a-good-way-to-do-this-type-of-mining

at least as I understand it is so simple when framed as a constraint program that you can solve it trivially with a simple program.. a simple program which you already knew . In other words constraint programming would be a cool way to solve this but at least with.. explain below my reasoning how I would implement it with a constraint solving package and then give the final trivial algorithm. Mixed..

Django dynamic model fields

http://stackoverflow.com/questions/7933596/django-dynamic-model-fields

data integrity requires a multi column unique key constraint which may be inefficient on some databases. You will need to..

Complex foreign key constraint in SQLAlchemy

http://stackoverflow.com/questions/8394177/complex-foreign-key-constraint-in-sqlalchemy

foreign key constraint in SQLAlchemy I have two tables SystemVariables and VariableOptions.. However I would like to add an extra database constraint that will ensure that choice_id is valid i.e. it's referring.. sysVar.id But I don't know how to construct this kind of constraint using SQL declarative or any other method. If necessary I could..

Saving a Numpy array as an image

http://stackoverflow.com/questions/902761/saving-a-numpy-array-as-an-image

an image Any format works png jpeg bmp... . One important constraint is that PIL is not present. python image numpy share improve..

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

NULL `rtMax` DOUBLE NULL `msrun_msrun_id` INT NOT NULL CONSTRAINT `fk_feature_msrun1` FOREIGN KEY `msrun_msrun_id` REFERENCES.. BLOB NOT NULL `msrun_msrun_id` INT NOT NULL CONSTRAINT `fk_spectrum_msrun1` FOREIGN KEY `msrun_msrun_id` REFERENCES.. INT NOT NULL `feature_feature_table_id` INT NOT NULL CONSTRAINT `fk_spectrum_has_feature_spectrum1` FOREIGN KEY `MSMS_precursor_precursor_id`..

Error: AttributeError: Transaction instance has no attribute 'trans_handle'

http://stackoverflow.com/questions/12781696/error-attributeerror-transaction-instance-has-no-attribute-trans-handle

'constraints' if nameconstraint 'constrtype' 'PRIMARY' s ' CONSTRAINT ' nameconstraint 'name' ' PRIMARY KEY ' countfieldinconstr 0.. ' nametable 'inform_about_table' 'name' ' n' s ' ' 'ADD CONSTRAINT ' nameconstraint 'name' ' FOREIGN KEY ' for namefield in nameconstraint.. WEB SITE VARCHAR 25 NOTES BLOB SUB_TYPE 1 INCLUDING BLOB CONSTRAINT PK_CLIENTS_ID PRIMARY KEY ID create ascending index IDX_CLIENTS_CITY..

Connection error to Access database

http://stackoverflow.com/questions/12800101/connection-error-to-access-database

WEB SITE VARCHAR 25 NOTES BLOB SUB_TYPE 1 INCLUDING BLOB CONSTRAINT PK_CLIENTS_ID PRIMARY KEY ID ''' s2 '''create ascending index..

Django unique together constraint failure?

http://stackoverflow.com/questions/17510261/django-unique-together-constraint-failure

something like table_name_foreign_key_id_slug_key UNIQUE CONSTRAINT btree foreign_key_id slug However I could still save into the..

Django ForeignKey which does not require referential integrity?

http://stackoverflow.com/questions/3558907/django-foreignkey-which-does-not-require-referential-integrity

alter the table directly eg. ALTER TABLE tablename DROP CONSTRAINT fk_constraint_name . You also inherently lose ON DELETE CASCADE..

Complex foreign key constraint in SQLAlchemy

http://stackoverflow.com/questions/8394177/complex-foreign-key-constraint-in-sqlalchemy

needed for the foreign key ALTER TABLE systemvariables ADD CONSTRAINT systemvariables_choice_id_fk FOREIGN KEY choice_id variable_id.. needed for the foreign key ALTER TABLE systemvariables ADD CONSTRAINT systemvariables_choice_id_fk FOREIGN KEY choice_id variable_id..