[Python] Run `del variable`, to delete global variables, within Python function?

I'm trying write a function that will delete variables given a list of strings of those variables' names. I'm trying this:

def delVars(ts):
for s in ts:
st = "del %s" % s
print(st)
try:
exec(st, globals(), locals())
except Exception as e:
print(e)


But except is always thrown: name 'var_name' is not defined, presumably because it's out-of-scope.

But why is this? I'm passing globals() to exec(), so it has access to variables outside the function scope.

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