类型错误：'NoneType'

Question

好吧，所以我在代码中遇到了这个荒谬的错误，其他 stackoverflow 错误似乎都没有帮助。我需要帮助找出这段代码有什么问题，尤其是在 def makePoem() 部分。

import random

noun = ["fossil" , "horse" , "aardvark" , "chef" , "judge"]
verb= [ "kicks", "jingles", "bounces", "slurps", "meows"]
adjs= ["fury" , "balding" , "incredulous" , "fragant"]
prep= ["against" , "after" , "into" , "beneath" , "for", "in"]
ads= ["curiously" , "extravagantly" , "furiously" , "sensuously"]

def selectn(list, n) :
selection = []
while (len(selection) != n) : 
    w = random.choice(list)
    if w not in selection :
        selection.append(w)
print(selection)
# For some reason I'm getting TypeError: 'NoneType' object is not subscriptable for "makePoem()" 
def makePoem() :
    my_nouns = selectn(noun,3)
    my_verbs = selectn(verb,3)
    my_adj = selectn(adjs,3)
    my_adverb = selectn(ads,1)
    my_prepo = selectn(prep,2)

print ("A {} {}".format(my_adj[0], my_nouns[0]))
print("")
print("A {} {} {} {} the {} {}".format(my_adj[0], my_nouns[0], my_verbs[0], my_prepo[0], my_adj[1], my_nouns[1]))
print("{}, the {} {}".format(my_adverb[0], my_nouns[0], my_verbs[1]))
print("the {} {} {} a {} {}".format(my_nouns[1], my_verbs[2], my_prepo[1], my_adj[2], my_nouns[2]))
makePoem()    

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Answer 1

您没有返回selection，而是打印它。将print(selection) 替换为return selection。