Guava Like Preconditions in Python.
Guava like precondition enforcing for Python.
Has been tested against:
Decorate functions with preconditions so that your code documents itself and at the same time removes the boilerplate code that is typically required when checking parameters.
def divideAby1or10( a, b ): if not ( 1 <= b <= 10 ): <raise some error> else: return a / b
Simply becomes the following:
from pyconditions.pre import Pre pre = Pre() @pre.between( "b", 1, 10 ) def divideAbyB( a, b ) return a / b
In the above example the precondition pre.between ensures that the b variable is between (1, 10) inclusive. If it is not then a PyCondition exception is thrown with the error message detailing what went wrong.
from pyconditions.pre import Pre pre = Pre() @pre.notNone( "a" ) @pre.between( "a", "a", "n" ) @pre.notNone( "b" ) @pre.between( "b", "n", "z" ) def concat( a, b ): return a + b
The above ensures that the variables a and b are never None and that a is between ( ?a?, ?n? ) inclusively and b is between ( ?n?, ?z? ) inclusively.
from pyconditions.pre import Pre pre = Pre() BASES = [ 2, 3, 4 ] @pre.custom( a, lambda x: x in BASES ) @pre.custom( b, lambda x: x % 2 == 0 ) def weirdMethod( a, b ): return a ** b
Using the custom precondition you are able to pass in any function that receives a single parameter and perform whatever condition checking you need.
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|Filename, size & hash SHA256 hash help||File type||Python version||Upload date|
|pyConditions-0.0.1.macosx-10.9-intel.exe (67.7 kB) Copy SHA256 hash SHA256||Windows Installer||any||Mar 20, 2014|
|pyConditions-0.0.1.tar.gz (7.0 kB) Copy SHA256 hash SHA256||Source||None||Mar 20, 2014|