删除字典中的重复条目

Question

我对计算非常陌生，我们被要求制作一个索引，一次读取一行文本，记下特定单词以及它们出现在哪些行上。我已经设法做到了这一点，但是，如果一个单词在同一行上出现不止一次，它会打印它所在的行两次，这在我的测试中是不允许的。

line = 1 
x = raw_input ( "Type in line 1 of the paragraph: " ).lower()
text = []
d = {}

while x != ".":
    x = convert_sentence(x)
    text = [x]
    text = string.join(text)
    text = string.split(text)
    for word in text:
        if word in d:
            d[ word ] += [line]
        else:
            d[ word ] = [line]
    x = raw_input ( "Enter a full stop to stop: " ).lower()
    line += 1
print "the index is"
for index in d:
    print index, ":", d[ index ]

这是我运行它时产生的输出：

the index is:
blow : [1, 1]
north : [2, 2]
brisk : [1]
youth : [2]
yesteryear : [4]
wind : [1, 3, 4]

你能帮我弄清楚我做错了什么吗？

Answer 1

您只需检查您找到的行是否尚未添加到条目中。为此，您需要检查if not line in d[word]。另外，要向list 添加元素，可以使用.append() 方法，它比+ 运算符更易于理解。

这是正确的代码：

line = 1
x = raw_input ("Type in line 1 of the paragraph: ").lower()
text = []
d = {}

while x != ".":
    x = convert_sentence(x)
    text = [x]
    text = string.join(text)
    text = string.split(text)
    for word in text:
        if word in d:
            if not line in d[word]:
                d[word].append(line)
        else:
            d[word] = [line]
    x = raw_input ("Enter a full stop to stop: ").lower()
    line += 1
print "the index is"
for index in d:
    print index, ":", d[index]