Python: Find the parent’s process id, real user ID of the current process and change real user ID
Python Operating System Services: Exercise-8 with Solution
Write a Python program to find the parent’s process id, real user ID of the current process and change real user ID.
Python Code :
import os print("Parent’s process id:",os.getppid()) uid = os.getuid() print("\nUser ID of the current process:", uid) uid = 1400 os.setuid(uid) print("\nUser ID changed") print("User ID of the current process:", os.getuid())
Parent’s process id: 11069 User ID of the current process: 1000 Traceback (most recent call last): File "/tmp/sessions/caaafe2b92f1fb7d/main.py", line 6, in
os.setuid(uid) PermissionError: [Errno 1] Operation not permitted
Python Code Editor:
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Python: Cache results with decorators
There is a great way to cache functions with decorators in Python. Caching will help save time and precious resources when there is an expensive function at hand.
Implementation is easy, just import lru_cache from functools library and decorate your function using @lru_cache.
from functools import lru_cache @lru_cache(maxsize=None) def fibo(a): if a <= 1: return a else: return fibo(a-1) + fibo(a-2) for i in range(20): print(fibo(i), end="|") print("\n\n", fibo.cache_info())
0|1|1|2|3|5|8|13|21|34|55|89|144|233|377|610|987|1597|2584|4181| CacheInfo(hits=36, misses=20, maxsize=None, currsize=20)
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