How to join two json files in python instead of nesting for loop

manpreet Best Answer 2 years ago

Every time i will get 500 records form file1 to join file2 which contains more than 100000 records it costs two minutes !!

with open(file1,'r') as f1,open(file2,'r') as f2:
    a=json.load(f1)
    b=json.load(f2)
    list_a=[]
    for i in range(len(a)):
        for n in range(len(b)):
            if b[n]["id"]==a[i]["id"]:
                list_a.append(dict(b[n],**a[i]))
with open(result,'w') as f3:
    json.dump(list_a, f3,sort_keys=True, ensure_ascii=False)

File1:

[{ "id":"1", "name":"Tom" }, 
{ "id":"2", "name":"Jim" }, 
{ "id":"3", "name":"Bob" }, 
{ "id":"4", "name":"Jeny" },  
{ "id":"5", "name":"Lara" }, 
{ "id":"6", "name":"Lin" }, 
{ "id":"7", "name":"Kim" }, 
{ "id":"8", "name":"Jack" }, 
{ "id":"9", "name":"Tony" }]

File 2:

[ { "id":"1", "Details":[ { "label":"jcc", "hooby":"Swimming" }, { "label":"hkt", "hooby":"Basketball" }, ] }, 
{ "id":"2", "Details":[ { 
                                                

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