Python 无法 loop/search 现有 JSON 条目

Python unable to loop/search for existing JSON entry

还在学习python。我正在构建一个 IPFS 哈希描述主列表。每次我创建一个新的 IPFS 哈希时,我都可以将带有描述的哈希添加到这个列表中,我可以在以后搜索以找到特定的哈希。我还试图确保在添加新哈希之前 JSON 文件中不存在相同的现有哈希。任何帮助将不胜感激,我可以学习如何在未来扩展这一点。

这是我拥有并将搜索、添加和删除的 JSON 文件。

{
"hashlist": [
    {
        "description": "Test Video",
        "ipfsHash": "QmVZATT8jWoCsNKzy2V3kwBrGXBjuKfifvrE",
        "url": ""
    },
    {
        "description": "Cat Photo",
        "ipfsHash": "QmVqpEomPZBgQ8dU8cpNezxZHG2oc3xQi61P2n",
        "url": ""
    },
    {
        "description": "Test Dir",
        "ipfsHash": "QmYdWbq65R4CdFqWGYnPA7V12bX7hf2zxv64AG",
        "url": ""
    }
]
}%

我可以使用创建的新散列添加到此列表,但是我无法搜索现有散列列表来查找散列或确保新散列未输入两次。

#!/usr/bin/python

import json
import os


data = []
if os.stat("hash.json").st_size != 0 :
    file = open('hash.json', 'r')
    data = json.load(file)
   # print(data)

choice = raw_input("What do you want to do? \n a)Add a new IPFS hash \n s)Seach stored hashes \n\n >>")


if choice == 'a':
    # Add a new hash.
    description = raw_input('Enter hash description: ')
    ipfsHash = raw_input('Enter IPFS hash: ')
    entry = {'description': description , 'ipfsHash': ipfsHash}

    # search existing hash listings here

    xglobal = 0
    for x in data["hashlist"]:
        if data["hashlist"][xglobal]["ipfsHash"] == ipfsHash:
            print "Hash already exist!"
            break
        else:
            xglobal += 1


    data['hashlist'].append(entry)
    file = open('hash.json', 'w')
    json.dump(data, file, sort_keys = True, indent = 4, ensure_ascii = False)
    file.close()
    print('IPFS Hash Added.')
    pass


elif choice == 's':
    # Search the current desciptions.
    searchTerm = raw_input('Enter search term: ')
    file = open('hash.json', 'r')
    data = json.load(file)
    file.close()
    # Search working 
    sglobal = 0
    for x in data["hashlist"]:
        if data["hashlist"][sglobal]["description"] == searchTerm:
            hash = data["hashlist"][sglobal]["ipfsHash"]
            print "Hash Requested:", hash
            break
        else:
            sglobal += 1


# Notes: How JSON is readable            

   # Show Hashes working !
#    print data["hashlist"][0]["ipfsHash"]
#    print data["hashlist"][1]["ipfsHash"]
#    print data["hashlist"][2]["ipfsHash"]
#    etc...

   # Show Descriptions working !
#    print data["hashlist"][0]["description"]
#    print data["hashlist"][1]["description"]
#    print data["hashlist"][2]["description"]
#    etc...        

因为我看不到列表条目顺序的重要性,所以我宁愿摆脱列表并改用字典。这样我就不必遍历列表并搜索 'hash-val'.
的存在 假设 hash_values 是唯一的,我的结构如下:

{
"hashlist": {
        "QmVZATT8jWoCsNKzy2V3kwBrGXBjuKfifvrE" : {
                                                    "description": "Test Video",
                                                    "url": ""
                                                },
        "QmVqpEomPZBgQ8dU8cpNezxZHG2oc3xQi61P2n" : {
                                                    "description": "Cat Photo",
                                                    "url": ""
                                                },
        "QmYdWbq65R4CdFqWGYnPA7V12bX7hf2zxv64AG" : {
                                                    "description": "Test Dir",
                                                    "url": ""
                                                }
    }
}



这样,在插入新条目时,如果 hash-value 或 'key' 是否存在,我可以轻松地查询字典。
类似于:

if new_hash_val not in data["hashlist"]:
    #proceed with adding entry
    data["hashlist"][new_hash_val] = {"description":"..." , "url":"..."}