Question

对于作业，我试图从用户输入的句子中剥离用户输入的一组字符。这是我到目前为止使用Python 2.7编写的代码：

    sentence = raw_input("Please write a sentence. ")
    remove = raw_input("Please input characters to remove from sentence. ")

    remove = remove.strip(" ") # in case user added spaces
    sentence = sentence.strip(remove)
    print sentence

Answer 1

我建议使用regex并利用character class，如下所示：

import re
sentence = raw_input("Please write a sentence. ")
remove = raw_input("Please input characters to remove from sentence. ")
regex = "[" + re.escape(remove) + "]"
sentence = re.sub(regex, "", sentence)
print(sentence)

它接受用户输入并转义任何特殊的正则表达式字符。这样，如果用户输入.*，则不会产生意外结果。然后用""替换任何这些字符，这些都不算什么。

Answer 2

使用sentence.replace(remove, "")将特定字符替换为空字符串，换句话说，删除特定字符串。

在您的代码中，sentence.strip(remove)无法正常工作，因为它只会从字符串的前和 end 中删除单词。

Answer 3

正如HUAN在答案中所说，sentence.strip只会从句子字符串的开头和结尾删除字符，要删除之间的字母，你应该使用sentence.replace，这里是你的代码我重写为使用replace，我还使用for循环来删除多个字符，所以如果用户输入类似＆＃34; hw＆＃34;句子＆＃34;你好世界＆＃34;成为＆＃34; ello orld＆＃34;：

sentence = raw_input("Please write a sentence. ")
remove = raw_input("Please input characters to remove from sentence. ")

remove = remove.strip(" ") # in case user added spaces
for c in remove:
    sentence = sentence.replace(c,"")
print sentence

Answer 4

这对我来说必须使用循环：

   sentence = raw_input("Please write a sentence. ")
   remove = raw_input("Please input characters to remove from sentence. ")

   remove = remove.replace(" ", "")
   i = 0
   while i < len(remove):
       sentence = sentence.replace(remove[i], "")
       i += 1
   print sentence

如何从另一个字符串中删除一个强字符

4 个答案: