Writing a Python function to check whether a string is pangram or not

Question

def pangram(s):

    check=""

    small=s.lower()

    combine=small.replace(" ","")

    for i in combine:

        if i in check:

            return False

        else:

            check+=i

    return True

print(pangram("The quick brown fox jumps over the lazy dog"))

#Note : Pangrams are words or sentences containing every letter of the alphabet at least once.

Let's say, e.g., "The quick brown fox jumps over the lazy dog"

I can't find out what's wrong with my code...

Answer 1

First, you need to import the string package from the python environment: 

import string

def ispangram(sentence, alphabet=string.ascii_lowercase): 

    return set(alphabet) <= set(sentence.lower()) 

print(ispangram(input('Sentence: ')))

set(alphabet) #creates a set of all characters of a given alphabet.

set(sentence.lower())# creates a set of all characters of the input sentence in lower case.

The comparison set(alphabet) <= set(sentence.lower() checks if the characters of the sentence are at least the characters of the alphabet.