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Python: Check for access to a specified path

Python Operating System Services: Exercise-4 with Solution

Write a Python program to check for access to a specified path. Test the existence, readability, writability and executability of the specified path.

Sample Solution:

Python Code :

import os
print('Exist:', os.access('c:\\Users\\Public\\C programming library.docx', os.F_OK))
print('Readable:', os.access('c:\\Users\\Public\\C programming library.docx', os.R_OK))
print('Writable:', os.access('c:\\Users\\Public\\C programming library.docx', os.W_OK))
print('Executable:', os.access('c:\\Users\\Public\\C programming library.docx', os.X_OK))

Sample Output:

Exist: False
Readable: False
Writable: False
Executable: False

Python Code Editor:

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Previous: Write a Python program to scan a specified directory and identify the sub directories and files.
Next: Write a Python program to get the size, permissions, owner, device, created, last modified and last accessed date time of a specified path.

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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)