cs-py-func 20150115

convenience facilities related to Python functions

funcname(func)

Returns a string to name func. I use this instead of func.__name__ because several things do not have a .__name__. It tries to use .__name__, but falls back to ..__str__().

@derived_property

Decorator for property functions which must be recomputed if another property is updated.

@derived_from(property_name)

Convenience wrapper of derived_property which names the parent property.

@returns_type(func, basetype)

Basis for decorators to do type checking of function return values. Example:

def returns_bool(func):
  ''' Decorator for functions which should return Booleans.
  '''
  return returns_type(func, bool)

@returns_bool
def f(x):
  return x == 1

This has been used for debugging functions called far from their definitions.