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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).

Sample Solution:

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())

Sample Output:

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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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)