CODEWITHSUNDEEP
pythonrecursionerror-handlingruntimeruntime-error
user1530318
user1530318

Reputation: 27697

Python possible to run while loop until RuntimeError: maximum recursion depth exceeded while calling a Python object

I'm running a recursive loop to achieve the maximum optimization for something and am reaching a point where the code hits a RuntimeError: maximum recursion depth exceeded while calling a Python object. This is expected, but I want to stop the code right at the point before it hits that error, so I can view my data at that point.

Is it possible to have a while loops saying something similar to that? Something like "Hey, run this loop until you reach maximum recursion depth. Once reached, stop and return."

Thanks for the help!

Upvotes: 4

Views: 1817

Answers (3)

Matti Lyra
Matti Lyra

Reputation: 13088

You can do the following

def recurse():
  try:
    recurse()
  except RuntimeError as e:
    if e.message == 'maximum recursion depth exceeded while calling a Python object':
      # don't recurse any longer
    else:
      # something else went wrong

http://docs.python.org/tutorial/errors.html

NOTE: it might be worth while to find out the error number of the max recursion depth error and check for that instead of the error string.

Upvotes: 6

inspectorG4dget
inspectorG4dget

Reputation: 113955

Store sys.maxrecursionlimit() as a variable (say maxrec) in a more global scope. Each time you recurse, deduct 1 from maxrec. Check before the recursion, though to make sure that maxrec is not 0. If maxrec hits 0, you'll know that you've hit the recursion limit and you can escape.

def myFunc(params):
    # do stuff
    if maxrec <= 0:
        return # return whatever you need to
    if maxrec > 0:
        maxrec -= 1
        myFunc(params)

maxrec = sys.getrecursionlimit()
myFunc(params)

Hope this helps

Upvotes: 1

Aaron S
Aaron S

Reputation: 731

Perhaps, have the recursive call in a try/except RuntimeError block? When the except is called return the value.

EDIT: Yes this is possible, like so:

def recursion(i):
    try:
        return recursion(i+1)
    except RuntimeError:
        return i

a=0
print recursion(a)

Upvotes: 2

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