Python: Retrieve the current working directory and change the dir
Python Operating System Services: Exercise-9 with Solution
Write a Python program to retrieve the current working directory and change the dir (moving up one).
Python Code :
import os print('Current dir:', os.getcwd()) print('\nChange the dir (moving up one):', os.pardir) os.chdir(os.pardir) print('Current dir:', os.getcwd()) print('\nChange the dir (moving up one):', os.pardir) os.chdir(os.pardir) print('Current dir:', os.getcwd())
Current dir: /tmp/sessions/a9c74a8fb247929c Change the dir (moving up one): .. Current dir: /tmp/sessions Change the dir (moving up one): .. Current dir: /tmp
Python Code Editor:
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Previous: Write a Python program to find the parent’s process id, real user ID of the current process and change real user ID.
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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())
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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