如何使用python最后两个单词用空格形成句子的print()

Question

如何使用python最后两个单词用空格形成句子的print((？就像"你好世界，有 200 件"一样，我需要打印："200 件"。非常感谢。

sentence = "Hello world, there is 200 pcs"
what_I_need = sentence.split()
what_I_need[-3]
# That prints "is"
print(what_I_need)
# But I need to print "is 200 pcs"

Answer 1

用[-2:]切片拆分的句子将返回所需的输出。尝试：

sentence = "Hello world, there is 200 pcs"
what_I_need = sentence.split()
print(what_I_need[-2:]) # output: ['200', 'pcs']
# or as a string:
print(" ".join(what_I_need[-2:])) # output: 200 pcs

Answer 2

def get_last_n_words(n:int, sentence:string):
last_n_Words = ' '.join(sentence.split()[-n:])
return last_n_words
sentence = "Hello world, there is 200 pcs"
lastThreeWords = get_last_n_words(3, sentence)
# lasthreeWords: "is 200 pcs"

Answer 3

这是因为您在索引 -3 中打印了列表，您应该从末尾到索引 -3 获取所有元素，以便您可以使用前面提到的 ： 运算符