[issue26174] Exception alias cause destruction of existing variable

[Zachary Ware]

Zachary Ware added the comment:

I don't believe this is a bug.

1) try/except does not introduce a new scope
2) 'except E as N' is just name assignment
3) except clauses are documented to always delete the exception alias at the end of the except block[0].  The example in the docs could be clarified to show that

   except E as N:
       foo

is really more like

   except E:
       N = sys.exc_info()[1]
       try:
           foo
       finally:
           del N

Note that 'as' assignment with the 'with' statement also overrides a local variable of the same name.  The simplest way to avoid this issue is to use a different name for the exception alias.


[0] https://docs.python.org/3/reference/compound_stmts.html#the-try-statement

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nosy: +zach.ware

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26174>
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