In article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] (fabian) wrote: > how testing if a variable exists in python as isset in php?? >
Would the following be a satisfactory implementation? def isset(varname, lloc = locals()): return varname in lloc or varname in globals() I believe this works as desired: >>> x = 5 >>> def f(y): ... z = 10 ... print isset('z') ## ==> True ... print isset('y') ## ==> True ... print isset('x') ## ==> True ... Tests: >>> f(1) ## As shown above >>> print isset('z') ## ==> False >>> print isset('y') ## ==> False >>> print isset('x') ## ==> True >>> print isset('varname') ## ==> False >>> print isset('lloc') ## ==> False >>> lloc = "foo!" >>> print isset('lloc') ## ==> True Perhaps this is not the most elegant solution, but I believe it handles scoping correctly. -M -- Michael J. Fromberger | Lecturer, Dept. of Computer Science http://www.dartmouth.edu/~sting/ | Dartmouth College, Hanover, NH, USA -- http://mail.python.org/mailman/listinfo/python-list