HMS Surprise said unto the world upon 05/22/2007 02:40 PM: > I am trying to understand the 'if' statement and the exec statement in > the code below. I would like to add several common routines to this > class and then inherit it into a class in another file. This other > class would need to access these common functions as well as inherit > the PyHttpTestCase class. In particular what is the purpose of the > surrounding plus signs? May I assume the if statement overrides an > imported assignment statement. > > > Thanks, > > jh > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > from PyHttpTestCase import PyHttpTestCase > from com.bitmechanic.maxq import Config > global validatorPkg > if __name__ == 'main': > validatorPkg = Config.getValidatorPkgName() > # Determine the validator for this testcase. > exec 'from '+validatorPkg+' import Validator'
The if test is, AFAICT, ensuring that validatorPkg is defined. Config.getValidatorPkgName() likely returns a string. The + signs are just concatenating a string to be exec'ed: >>>> validatorPkg = 'some string returned by getValidatorPkgName()' >>>> 'from '+validatorPkg+' import Validator' > 'from some string returned by getValidatorPkgName() import Validator' >>>> > HTH, Brian vdB -- http://mail.python.org/mailman/listinfo/python-list
