python - 如何检查输入的字母是否在列表中？

Question

如何检查用户输入的单词的字母是否都在列表中？这似乎不起作用:

letters = ["a","b","c","d"]
inpt = str(raw_input())
if list(inpt) in letters:
    print "letters are in list"
else:
    print "letters are not in list"

Answer 1

比如像这样？

letters = set(["a","b","c","d"])
inpt = raw_input()
if set(inpt).issubset(letters):
    print "letters are in list"
else:
    print "letters are not in list"

比照。 Python - verifying if one list is a subset of the other