<p>我创建了这段代码来分析一个输入句子,以便用户在其中搜索某个单词。然而,我似乎不知道如何使它在输入句子中的所有标点符号被忽略。我之所以需要这样做是因为,如果输入“hello there,friend”这样的句子,“there”这个词就被算作“there”,因此如果用户正在搜索“there”,它会说它不在句子中。请帮帮我。我对python真的很陌生。你知道吗</p>
<pre><code>print("Please enter a sentence")
sentence=input()
lowersen=(sentence.lower())
print(lowersen)
splitlowersen=(lowersen.split())
print (splitlowersen)
print("Enter word")
word=input()
lword=(word.lower())
if lword in splitlowersen:
print(lword, "is in sentence")
for i, j in enumerate (splitlowersen):
if j==lword:
print(""+lword+"","is in position", i+1)
if lword not in splitlowersen:
print (lword, "is not in sentence")
</code></pre>