[Python-Dev] Exceptions in LOAD_GLOBAL and LOAD_NAME

Thu Feb 23 11:12:13 CET 2012

The code below causes different behaviour for LOAD_GLOBAL and LOAD_NAME.
Which is correct?
Should exceptions raised in the equality test be converted to a 
NameError or just propogated?
Cheers,
Mark.
-------------------------------------
import sys
class S(str):
 pass
def eq_except(self, other):
 if isinstance(other, str):
 raise TypeError("Cannot compare S and str")
globals()[S("a")] = 0
S.__eq__ = eq_except
def f():
 print(a)
try:
 f()
except:
 print(sys.exc_info()[1])
try:
 print(a)
except:
 print(sys.exc_info()[1])
----------------------------------
Output:
TypeError('Cannot compare S and str',)
NameError("name 'a' is not defined",)