Re: initializing "parameters" class in Python only once?

[Ethan Furman]

On 07/16/2014 08:35 PM, alex23 wrote:

On 15/07/2014 3:28 PM, Steven D'Aprano wrote:

# === module params.py ===
class Params(object):
     a = 1
     b = 2

     @property
     def c(self):
         return self.a**2 + self.b**2 - self.a + 1

params = Params()
del Params  # hide the class


Then callers just say:

from params import params
print params.c

I'd replace the instantiation & deletion of the class in params.py with:

     import sys
     sys.modules[__name__] = Params()

..and replace the module itself with the parameter object. I'd also add:

     __file__ = __file__

...to the class definition to help with debugging. But this is really just 
bikeshedding.

Just make sure the 'sys.modules' assignment happens at the *end* of params.py.

--
~Ethan~
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