用pop删除列表中的多个对象[重复]

Question

我有一个 JSON 对象，其中包含一些随机重复的属性。我想根据"word" index 删除那些重复的，只保留第一次出现，如示例所示：

{ "word" : "Apple", "meaning" : "First meaning" },
{ "word" : "Ball", "meaning" : " \u090f\u0909\u091f\u093e" },
{ "word" : "Cat", "meaning" : " \u090f\u0909\u091f\u093e" },
{ "word" : "Apple", "meaning" : "Repeated, but has another meaning" },
{ "word" : "Doll", "meaning" : " \u090f\u0909\u091f\u093e" },

我是一名 Python 初学者，目前无法领先于这个解决方案：

#!/usr/bin
import json

source="/var/www/dictionary/repeated.json"
destination="/var/www/dictionary/corrected.json"

def remove_redundant():

    with open(source, "r") as src:      
        src_object = json.load(src)

        for i in xrange(len(src_object)):

            escape = 1

            for j in xrange(len(src_object)):

                if src_object[j]["word"] == src_object[i]["word"]:

                    # leave the first occurance
                    if escape == 1:
                        escape = 2
                        continue
                    else:
                        src_object.pop(j)

    # open(destination, "w+").write(json.dumps(src_object, sort_keys=True, indent=4, separators=(',', ': ')))

    src.close()

remove_redundant()

我不断收到的错误是IndexError: list index out of range，因为 len 不断变化。感谢您的帮助。

Answer 1

这里是一个使用pop()的示例供参考

a = [{ "word" : "Apple", "meaning" : "First meaning" },
     { "word" : "Ball", "meaning" : " \u090f\u0909\u091f\u093e" },
     { "word" : "Cat", "meaning" : " \u090f\u0909\u091f\u093e" },
     { "word" : "Apple", "meaning" : "Repeated, but has another meaning" },
     { "word" : "Doll", "meaning" : " \u090f\u0909\u091f\u093e" },]

b = list()
keys = set()

while a:
    x = a.pop(0)
    if x['word'] not in keys:
        keys.add(x['word'])
        b.append(x)
a = b
del b
del keys

a 现在包含：

[{'meaning': 'First meaning', 'word': 'Apple'},
 {'meaning': ' \\u090f\\u0909\\u091f\\u093e', 'word': 'Ball'},
 {'meaning': ' \\u090f\\u0909\\u091f\\u093e', 'word': 'Cat'},
 {'meaning': ' \\u090f\\u0909\\u091f\\u093e', 'word': 'Doll'}]

Answer 2

你可以这样做

from collections import OrderedDict
d = OrderedDict()
for item in data:
    if item["word"] not in d:
        d[item["word"]] = item

print d.values()

输出

[{'meaning': 'First meaning', 'word': 'Apple'},
 {'meaning': ' \\u090f\\u0909\\u091f\\u093e', 'word': 'Ball'},
 {'meaning': ' \\u090f\\u0909\\u091f\\u093e', 'word': 'Cat'},
 {'meaning': ' \\u090f\\u0909\\u091f\\u093e', 'word': 'Doll'}]