Python: Recursion limit
Python Basic: Exercise-80 with Solution
Write a Python program to get the current value of the recursion limit.
sys.getrecursionlimit(): Return the current value of the recursion limit, the maximum depth of the Python interpreter stack. This limit prevents infinite recursion from causing an overflow of the C stack and crashing Python. It can be set by setrecursionlimit().
Sample Solution:
Python Code:
import sys
print()
print("Current value of the recursion limit:")
print(sys.getrecursionlimit())
print()
Sample Output:
Current value of the recursion limit: 1000
How to change the maximum recursion depth in Python?
sys.setrecursionlimit(limit): Set the maximum depth of the Python interpreter stack to limit. This limit prevents infinite recursion from causing an overflow of the C stack and crashing Python.
The highest possible limit is platform-dependent. A user may need to set the limit higher when they have a program that requires deep recursion and a platform that supports a higher limit. This should be done with care, because a too-high limit can lead to a crash.
Python Code:
import sys
print("Call sys.getrecursionlimit() to get the current recursion limit:")
recursion_limit = sys.getrecursionlimit()
print(recursion_limit)
print("\nCall sys.setrecursionlimit(n) to change the recursion limit to n operations:")
sys.setrecursionlimit(1001)
new_recursion_limit = sys.getrecursionlimit()
print(new_recursion_limit)
Sample Output:
Call sys.getrecursionlimit() to get the current recursion limit: 1000 Call sys.setrecursionlimit(n) to change the recursion limit to n operations: 1001
Python Code Editor:
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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