Top-rated recipes tagged "check"

Perfect Square Checker (Python)

2014-09-10T02:21:27-07:00

Python recipe 578931 by Ethan Hann (check, checker, math, mathematics, root, square).

This program will take input from the user and either check if a number is a perfect square or square a number, depending on user's choice.

Chek if a number is a power of two (Python)

2010-12-23T11:29:38-08:00

Python recipe 577514 by A. Polino (2, check, number, power, python). Revision 2.

Pretty good way to check if a number is a power of two or not.

A Fun Perfect Square Checker Using Integer Arithmetic Only... ;o) (Bash)

2014-09-16T22:27:04-07:00

Bash recipe 578934 by Barry Walker (arithmetic, bash, check, checker, cygwin, macbook_pro, math, mathematics, perfect, root, square).

A recent Python upload here gave me the inspiration to do a bash version... This is a little tongue-in-cheek but an enjoyable bit of fun.

It took around 11 seconds to prove 90000000000 had a perfect square of 300000...

It is a stand alone program and has a degree of INPUT error correction...

It was done on a MacBook Pro, OSX 10.7.5, default bash terminal and should work on Linux flavours but it is untested...

Enjoy finding simple solutions to often very difficult problems...

Bazza...

Recipe With No Name Yet (Python)

2012-08-22T17:57:12-07:00

Python recipe 578221 by Cyril (check, debug, decorator, wrapper). Revision 9.

Not a very new recipe, but a short one and (I hope) useful :

wrapping any function "f" with two decorators "enter_event" and "exit_event" that will trigger calling of user functions when, ... hum ... evidently, just before entering and just after exiting the "f" function.

Typical usages :

debugging on a function by function basis :
- emit a trace in log file to see when functions are called and check sequences correctness (very usefull when programming by events)
- feed a profile analyzer (by fine tuning which functions are enabled)
- feed a code coverage analyzer ( " )
kind of validator on function calling :
- implement programming by contracts :
  - check that parameters values of "f" function will not have an unexpected value or be of an unexpected type
  - this allow to increase code robustness by narrowing
- implement invariants (eg. check that returned value is always in the excepted range, ...)
- insure that a function follow specifications by meta-checking that has always predictable results (eg. return the fixed expected value for each possible input value, ...)
minimum modification of existing code
in the same thinking line as the "monkey patching" concept

Notes on usage :

recipe works on functions and any kind of methods (methods, class methods, and static methods)
the usage order of "@enter_event" and "@exit_event" decorators doesn't matter : the result will be the same

PLEASE VOTE FOR THIS RECIPE if you like it !

GTIN Validate Check Digit or Add Check Digit (Python)

2011-11-26T07:12:18-08:00

Python recipe 577963 by Richard Thieman (check, digits, gtin).

A python class I wrote to add or validate a GTIN check digit.

Type checking using Python 3.x annotations (Python)

2013-05-23T22:46:19-07:00

Python recipe 578528 by David Mertz (annotations, check, decorator, python3, type, typecheck). Revision 5.

Some other recipes have been suggested to allow type checking by various means. Some of these require the use of type specification in a decorator itself. Others try to be much more elaborate in processing a large variety of annotations (but hence require much more and more convoluted code).

The recipe provided below is very short, and simply provides actual type checking of arguments and return values. It utilizes an unadorned decorator, rather than manufacture one that is parameterized by types or other arguments.