A function to check if a word has repeated characters and tell you if it's an isogram or not

isIsogram.py

word = input("Please write a word: ")
word = word.lower()

def isIsogram(word):
    array = []
    for character in word:
        if character not in array:
            array.append(character)
        else:
            print("Is not an isogram")
            return False
    print("Is an isogram")
    return True
#This function checks each character in the word
# and adds it to an array if it is not already present.
# If a character is found in the array, it means
# it is a duplicate, and the function returns False.
# If all characters are unique, it returns True.

isIsogram(word)