[EMAIL PROTECTED] wrote:
On Aug 17, 8:09 pm, Matthew Fitzgibbons <[EMAIL PROTECTED]> wrote:
Kurien Mathew wrote:
Hello,
Any suggestions on a good python equivalent for the following C code:
while (loopCondition)
{
if (condition1)
goto next;
if (condition2)
goto next;
if (condition3)
goto next;
stmt1;
stmt2;
next:
stmt3;
stmt4;
}
Thanks
Kurien
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I would not be too happy if I saw C code like that in my repository.
This is equivalent:
while (loopCondition) {
if (!(condition1 || condition2 || condition3)) {
stmt1;
stmt2;
}
stmt3;
stmt4;
}
In Python:
while (loopCondition):
if not (condition1 or condition2 or condition3):
stmt1
stmt2
stmt3
stmt4
If stmt3 and stmt4 are error cleanup code, I would use try/finally.
while loopCondition:
try:
if condition1:
raise Error1()
if condition2:
raise Error2()
if condition3:
raise Error3()
stmt1
stmt2
finally:
stmt3
stmt4
This will also bail out of the loop on and exception and the exception
will get to the next level. If you don't want that to happen, put an
appropriate except block before the finally.
-Matt- Hide quoted text -
- Show quoted text -
class Goto_Target(Exception):
pass
def Goto_is_not_dead(nIn):
try:
if (nIn == 1): raise Goto_Target
if (nIn == 2): raise Goto_Target
inv = 1.0 / nIn
print 'Good Input ' + str(nIn) + ' inv=' + str(inv)
except Goto_Target:
pass
except Exception, e:
print 'Error Input ' + str(nIn) + ' ' + str(e)
finally:
print 'any input ' + str(nIn)
if __name__ == '__main__':
Goto_is_not_dead(0)
Goto_is_not_dead(2)
Goto_is_not_dead(3)
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I think this is needlessly ugly. You can accomplish the same with a
simple if-else. In this case you're also masking exceptions other than
Goto_Target, which makes debugging _really_ difficult. If you need to
have the cleanup code executed on _any_ exception, you can still use
try-finally without any except blocks. Your code is equivalent to this:
def goto_is_dead(n):
try:
if n == 0 or n == 1 or n == 2:
# if you're validating input, validate the input
print "Error Input %s" % n
else:
print "Good Input %s inv= %s" % (n, (1. / n))
finally:
print "any input %s" % n
if __name__ == '__main__':
goto_id_dead(0)
goto_id_dead(2)
goto_id_dead(3)
More concise, readable, and maintainable.
-Matt
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