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Commenting sucks so let your code do it for you with Guava like preconditions that also actually do something.

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Commenting sucks so let your code do it for you with preconditions that actually do something.

Examples:

from pyconditions.pre import *

@Between( "b", 1, 10 )
def divideAbyB( a, b )
  return a / b

@NotNone( "a" )
@Between( "a", "a", "n" )
@NotNone( "b" )
@Between( "b", "n", "z" )
def concat( a, b ):
  return a + b

@Custom( "a", lambda x: x % 2 == 0 )
@Custom( "b", lambda x: not x % 2 == 0 )
def evenOdd( a, b ):
  return a * b

The documenting is there with the code it self, and if you violate the preconditions then a PyCondition exception is thrown with a much nicer error message than broken code.

evenOdd( 3, 1 )
pyconditions.exceptions.PyCondition: 3 did not pass the custom condition for parameter 'a' in function evenOdd

How about some postconditions?

from pyconditions.post import *

@NotNone()
def test( a ):
  return a

@Custom( lambda a: a % 2 == 0 )
def even( a ):
  return a
test( None )
pyconditions.exception.PyCondition: The return value for uber.awesome.project.test was None

You can also mix the two as well.

from pyconditions import pre
from pyconditions import post

@pre.Custom( "a", lamda a: a % 2 == 0 )
@post.Custom( lambda a: a % 2 == 0 )
def superSafeEven( a ):
  return a

Have conditions you want added? Open a PR with code. Have an issue? Open a PR with fixed code.

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pyConditions-0.2.1.macosx-10.9-intel.exe (70.7 kB) Copy SHA256 hash SHA256 Windows Installer any Mar 21, 2014
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