are variables local only to try/except blocks?

[BarrySearle]

# Is this valid (or is excp local to try/except)?
try:
try:
doSomething1
excp = 0
except:
excp = 1
#endTry
if (_excp_): doSomething1 # is excp defined here?
excp = 0
except:
excp = 1
#endTry
if (excp): doSomething2 # is excp defined here?
# valid, but more verbose (and maybe redundant?)
excp = 0
try:
excp = 0
try:
doSomething1
excp = 0 # reset incase future inner block
except:
excp = 1
#endTry
if (_excp_): doSomething1
excp = 0 # reset incase inner block set excp=1
except:
excp = 1
#endTry
if (excp): doSomething2

I am not so interested in what a particular version of the
Python/Jython interpreter does, but rather what is "right".

Pls "CC" replies to se****@ca.ibm.com (as well as newsgroup)
Barry Searle, se****@ca.ibm.com

[Fredrik Lundh]

BarrySearle wrote:

# Is this valid
yes.
(or is excp local to try/except)?
no. try/except doesn't introduce a new scope.
try:
try:
doSomething1
excp = 0
except:
excp = 1
#endTry
if (_excp_): doSomething1 # is excp defined here?
yes (but _excp_ isn't defined, so you need to change that if-statement)
excp = 0
except:
excp = 1
#endTry
if (excp): doSomething2 # is excp defined here?

yes.

</F>

[Steve Holden]

BarrySearle wrote:

# Is this valid (or is excp local to try/except)?
try:
try:
doSomething1
excp = 0
This block is problematic because excp won;t be set if doSomething1
raises an exception.
except:
excp = 1
#endTry
if (_excp_): doSomething1 # is excp defined here?
Presumably you are expecting doSomething1 to fail or succeed in some
non-deterministic way? Otherwise this will just raise the same exception
again!
excp = 0
except:
excp = 1
#endTry
if (excp): doSomething2 # is excp defined here?
# valid, but more verbose (and maybe redundant?)
excp = 0
try:
excp = 0
try:
doSomething1
excp = 0 # reset incase future inner block
except:
excp = 1
#endTry
if (_excp_): doSomething1
excp = 0 # reset incase inner block set excp=1
except:
excp = 1
#endTry
if (excp): doSomething2

I am not so interested in what a particular version of the
Python/Jython interpreter does, but rather what is "right".

Pls "CC" replies to se****@ca.ibm.com (as well as newsgroup)
Barry Searle, se****@ca.ibm.com

Your approach to exception handling is a little simplistic, resulting on
code that reads about as well as a plate of spaghetti.

What are you actually trying to *do*? What problem do you need to solve?

regards
Steve
--
Steve Holden [phone] [phone]
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.pycon.org