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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.

Sample Solution:

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())

Sample Output:

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: Tips of the Day

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())

Output:

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)