How to pass parameter when importing a module?

[Bo Peng]

Dear list,
What I would like to do is something like:
In myModule.py ( a wrapper module for different versions of the module),
  if lib == 'standard':
    from myModule_std import *
  elsif lib == 'optimized'
    from myModule_op import *
but I do not know how to pass variable lib to myModule.py to achieve the 
following effect:

  >>> lib = 'standard'
  >>> from myModule import *     # actually import myModule_std
From what I have read, from .... does not take any parameter. Maybe I 
should use environmental variables?

  >>> os.putenv('lib', 'standard')
  >>> from myModule import *
  myModule.py
  -------------
  import os
  lib = os.getenv('lib')
  ...
or use a separate module?
  param.py
  ---------
  para = {}
  def setParam(key, val):
    para[key] = val
  main session
  ------------
  >>> import param
  >>> param.setParam('lib','standard')
  >>> from myModule import *
  in myModule.py
  --------------
  from param import para
  try:
    lib = para['lib']
  except:
    lib = 'standard'
  ...
Is there an established approach for this problem?
Many thanks in davance.
Bo
===============================================================================
FULL STORY:
I have several modules all (SWIG) wrapped from the same C++ source code 
but with different compiling flags. For example,

  myModule_std  (standard module)
  myModule_op   (optimized, without error checking)
  ...
These modules are put directly under /.../site-packages . To load a 
module, I use, for example

  from myModule_op import *
This works fine until I need to write some helper functions for 
myModule_?? in another module myHelper.py since I do not know which 
myModule is being used

  from myModule?? import A,B
I find one solution
  # find out which module is being used
  import sys
  if 'myModule_op' in sys.modules.keys():
    from myModule_op import A,B
  else:
    from myModule_std import A,B
but not completely satisfied. Therefore, I am writing a 'wrapper' module 
myModule that can load one of the myModule_?? modules according to user 
supplied info.

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