def test():
from math import radians, degrees, pi
class Angle(object):
def __init__(self,rad):
self._rad = rad
@Property
def rad():
'''The angle in radians'''
def fget(self):
return self._rad
def fset(self,angle):
if isinstance(angle,Angle): angle = angle.rad
self._rad = float(angle)
@Property
def deg():
'''The angle in degrees'''
def fget(self):
return degrees(self._rad)
def fset(self,angle):
if isinstance(angle,Angle): angle = angle.deg
self._rad = radians(angle)
def almostEquals(x,y):
return abs(x-y) < 1e-9
a = Angle(pi/3)
assert a.rad == pi/3 and almostEquals(a.deg, 60)
a.rad = pi/4
assert a.rad == pi/4 and almostEquals(a.deg, 45)
a.deg = 30
assert a.rad == pi/6 and almostEquals(a.deg, 30)
print Angle.rad.__doc__
print Angle.deg.__doc__
def Property(function):
keys = 'fget', 'fset', 'fdel'
func_locals = {'doc':function.__doc__}
def probeFunc(frame, event, arg):
if event == 'return':
locals = frame.f_locals
func_locals.update(dict((k,locals.get(k)) for k in keys))
sys.settrace(None)
return probeFunc
sys.settrace(probeFunc)
function()
return property(**func_locals)
if __name__ == '__main__':
test()
