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Python: Create a file and write some text and rename the file name

Python Operating System Services: Exercise-7 with Solution

Write a Python program to create a file and write some text and rename the file name.

Sample Solution:

Python Code :

import glob
import os
with open('a.txt', 'w') as f:
   f.write('Python program to create a symbolic link and read it to decide the original file pointed by the link.')
print('\nInitial file/dir name:', os.listdir())
with open('a.txt', 'r') as f:
   print('\nContents of a.txt:', repr(f.read()))   
os.rename('a.txt', 'b.txt')
print('\nAfter renaming initial file/dir name:', os.listdir())
with open('b.txt', 'r') as f:
   print('\nContents of b.txt:', repr(f.read()))

Sample Output:

Initial file/dir name: ['main.py', 'a.txt']

Contents of a.txt: 'Python program to create a symbolic link and read it to decide the original file pointed by the link.'

After renaming initial file/dir name: ['main.py', 'b.txt']

Contents of b.txt: 'Python program to create a symbolic link and read it to decide the original file pointed by the link.'

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)