Python Challenges: Check if a number is a power of a given base
Python Challenges - 1: Exercise-6 with Solution
Write a Python program to check if a number is a power of a given base.
Sample Solution:-
Python Code:
import math
def isPower (n, base):
if base == 1 and n != 1:
return False
if base == 1 and n == 1:
return True
if base == 0 and n != 1:
return False
power = int (math.log(n, base) + 0.5)
return base ** power == n
print(isPower(127,2))
print(isPower(128,2))
print(isPower(27,2))
print(isPower (27,3))
print(isPower (28,3))
print(isPower (2**10,2))
print(isPower (2**12,2))
print(isPower(2,2))
print(isPower(5,5))
print(isPower(10,1))
Sample Output:
False True False True False True True True True False
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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