Python Language Increasing the Maximum Recursion Depth


Example

There is a limit to the depth of possible recursion, which depends on the Python implementation. When the limit is reached, a RuntimeError exception is raised:

RuntimeError: Maximum Recursion Depth Exceeded

Here's a sample of a program that would cause this error:

def cursing(depth):
  try:
    cursing(depth + 1) # actually, re-cursing
  except RuntimeError as RE:
    print('I recursed {} times!'.format(depth))
cursing(0)
# Out: I recursed 1083 times!

It is possible to change the recursion depth limit by using

sys.setrecursionlimit(limit) 

You can check what the current parameters of the limit are by running:

sys.getrecursionlimit()

Running the same method above with our new limit we get

sys.setrecursionlimit(2000)
cursing(0)
# Out: I recursed 1997 times!

From Python 3.5, the exception is a RecursionError, which is derived from RuntimeError.