Write a program to check if the given word is Isogram & Pair isogram in python

Upasana | May 04, 2019 | 1 min read | 1,805 views | Python Coding Problems

An isogram is a word or phrase without a repeating letter.

Isogram

An isogram (also known as a "nonpattern word") is a logological term for a word or phrase without a repeating letter. It is also used by some people to mean a word or phrase in which each letter appears the same number of times, not necessarily just once.

Examples include:

uncopyrightables - 16 characters
abolishment - 11 letters
complaints, background, bankruptcy - 10 letters

Wikipedia.org

https://en.wikipedia.org/wiki/Isogram

We can write a simple program that checks if the given word is Isogram or not using the below logic:

lowercase the input word
remove all the duplicate characters using set and store the output in variable a
get all the characters without removing duplicate into another variable b
check if length of a and b is exactly the same i.e. it is an Isogram, else not.

Isogram: python implementation

def check_isogram(string):
    string = string.lower()
    a = [x for x in list(set(list(string))) if x != ' ']
    b = [x for x in list(string) if x != ' ']
    if len(a) == len(b):
        return string + " is an Isogram"
    else:
        return string + " is not an Isogram"
print(check_isogram("document"))

Output

document is an Isogram

Pair Isograms

A pair isogram is a word where every letter appears exactly twice.

check_pair_isogram.py

from collections import Counter

def check_pair_isogram(string):
    dict = Counter(list(string))
    dict_list = dict.values()
    if len(set(dict_list)) == 1:
        return string + " is pair Isogram"
    else:
        return string + " is NOT pair Isogram"

print(check_pair_isogram("intestines"))

Output

intestines is pair Isogram