Sets, Strings
A pangram is a sentence that contains all the letters of the English alphabet at least once, like “The quick brown fox jumps over the lazy dog.”
Write a function to check a sentence to see if it is a pangram or not.
For example:
>>> is_pangram("The quick brown fox jumps over the lazy dog!")
True
>>> is_pangram("I like cats, but not mice")
False
def is_pangram(sentence):
"""Given a string, return True if it is a pangram, False otherwise."""