Python Challenges: Get the Hamming numbers upto a given numbers also check whether a given number is a Hamming number
Python Challenges - 1: Exercise-25 with Solution
Write a Python program to get the Hamming numbers upto a given numbers also check whether a given number is a Hamming number.
Hamming numbers are numbers of the form
H = 2i x 3j x 5k
Where i, j, k ≥ 0
The sequence of Hamming numbers 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 27. . . consists of all numbers of the form 2i.3j.5k where i, j and k are non-negative integers.
Explanation:
Sample Solution:-
Python Code:
def is_hamming_numbers(x):
if x == 1:
return 1
if x % 2 == 0:
return is_hamming_numbers(x/2)
if x % 3 == 0:
return is_hamming_numbers(x/3)
if x % 5 == 0:
return is_hamming_numbers(x/5)
return 0
def hamming_numbers_sequence(x):
if x == 1:
return 1
hamming_numbers_sequence(x-1)
if is_hamming_numbers(x) == True:
print("%s" % x, end=' ')
print(is_hamming_numbers(7))
print(is_hamming_numbers(1))
hamming_numbers_sequence(24)
print()
Sample Output:
0 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24
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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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