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
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