将表格转换为 JSON

Question

我正在尝试将表格（csv 格式）转换为 JSON 格式。

输入 (input.csv)

id,v1,v2,v3
ab,1,2,3
cd,4,5,6
ef,7,8,9

预期输出

[
{"id": "ab", "vars": [{"var": "v1", "value": 1}, {"var": "v2", "value": 2}, {"var": "v3", "value": 3}]},
{"id": "cd", "vars": [{"var": "v1", "value": 4}, {"var": "v2", "value": 5}, {"var": "v3", "value": 6}]},
{"id": "ef", "vars": [{"var": "v1", "value": 7}, {"var": "v2", "value": 8}, {"var": "v3", "value": 9}]}
]

到目前为止，我已经为此编写了一个循环，并且有效

import csv 
import json 

def make_json(csv_path, json_path): 
      
    V1 = {}
    V2 = {}
    V3 = {}
    V = {}
    Vlist = []
      
    with open(csv_path) as csvf: 
        csvReader = csv.DictReader(csvf) 
        
        for rows in csvReader: 
            
            V["id"] = rows["id"]
            
            V1["var"] = "v1"
            V1["value"] = rows['v1']
            V2["var"] = "v2"
            V2["value"] = rows['v2']
            V3["var"] = "v3"
            V3["value"] = rows['v3']
            
            V["vars"] = [V1, V2, V3]
            Vlist.append(V)
            
    json_string = json.dumps(Vlist)
    
    with open(json_path, 'w') as jsonf: 
        jsonf.write(json.dumps(json_string)) 

make_json("input.csv", "my.json")

my.json

[{"id": "ef", "vars": [{"var": "v1", "value": "7"}, {"var": "v2", "value": "8"}, {"var": "v3", "value": "9"}]}, {"id": "ef", "vars": [{"var": "v1", "value": "7"}, {"var": "v2", "value": "8"}, {"var": "v3", "value": "9"}]}, {"id": "ef", "vars": [{"var": "v1", "value": "7"}, {"var": "v2", "value": "8"}, {"var": "v3", "value": "9"}]}]

但是，我真正的 csv 很大，有十几列（非结构化列名。不是 v1、v2、v3）。所以我正在寻找更聪明的解决方案。任何建议都非常感谢。

Answer 1

快速谷歌搜索发现此链接：https://datatofish.com/csv-to-json-string-python/

相关部分大概是这样的：

import pandas as pd
read_file = pd.read_csv (import_file_path)
...
read_file.to_json (export_file_path)

还有很多在线工具，如果你只需要做一次。 （如：https://csvjson.com/csv2json

Answer 2

使用熊猫：

import pandas as pd
pd.read_csv('filename.csv').to_json('filename.json')