Pangram function in Python

pangram.py

/*
** Check is a given string is a Pangram (https://en.wikipedia.org/wiki/Pangram)
** @params string
** @return bool
*/
def is_pangram( str ):
	abc = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'x' ,'y', 'w', 'z']
	abcClone = list(abc)
	str = ''.join(str.split())
	for l in str:
		if l in abc:
			if l in abcClone:
				abcClone.remove(l)
		else:
			return False
	if len(abcClone) == 0:
		return True
	return False

//Example:
print(is_pangram('abcdefghijklmnopqrtuvxzwy')) // True