Michael McNeil Forbes wrote: > Here is one fairly ugly solution: > > module_g.py > ----------- > def g(x,math): > return math.sqrt(x) > > >>>>import math, cmath, module_g >>>>module_g.g(2,math) > > 1.4142135623730951 > >>>>module_g.g(-2,cmath) > > 1.4142135623730951j > > I am sure there is a better way of doing this that makes use of the > type of the argument (Dynamical scoping would solve the > problem but we don't want to go there...). Note that the following > function would work fine > > def f(x): > return abs(x) > > because of the special member __abs__ attached to the type. There is no > corresponding member for sqrt, sin etc. > > What is the "proper" pythonic way to do this?
Use the appropriate library which already implements the features you want. In [8]: class A(object): ...: def __init__(self, x): ...: self.x = x ...: def sqrt(self): ...: return 2*self.x ...: ...: In [9]: a = A(10) In [10]: import numpy In [11]: numpy.sqrt(a) Out[11]: 20 In [12]: numpy.sqrt(10) Out[12]: 3.1622776601683795 In [13]: numpy.sqrt(10j) Out[13]: (2.2360679774997898+2.2360679774997898j) -- Robert Kern [EMAIL PROTECTED] "In the fields of hell where the grass grows high Are the graves of dreams allowed to die." -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
