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Python: Test whether a given path exists or not

Python Operating System Services: Exercise-12 with Solution

Write a Python program to test whether a given path exists or not. If the path exist find the filename and directory portion of the said path.

Sample Solution:

Python Code :

import os
print("Test a path exists or not:")
path = r'g:\\testpath\\a.txt'
print(os.path.exists(path))
path = r'g:\\testpath\\p.txt'
print(os.path.exists(path))
print("\nFile name of the path:")
print(os.path.basename(path))
print("\nDir name of the path:")
print(os.path.dirname(path))

Sample Output:

Test a path exists or not:
False
False

File name of the path:
g:\\testpath\\p.txt

Dir name of the path:

Python Code Editor:

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Previous: Write a Python program to iterate over a root level path and print all its sub-directories and files, also loop over specified dirs and files.
Next: Write a Python program to join one or more path components together and split a given path in directory and file.

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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)