json值仅写入python中的第一个字段

Question

I'm trying to write csv data (MAC addresses and signal strength values) to a JSON file using Python, but the data is only writing to the first field. How do I get each signal strength value to write to the correct MAC address?

This is my csv data (total of 30 addresses):

    wifi                  rss
    b0:7f:b9:bc:f0:e2   -56
    34:a8:4e:fc:13:50   -59
    34:a8:4e:fd:3c:50   -57
    34:a8:4e:fd:3c:53   -55
    34:a8:4e:fc:13:53   -58
    b0:7f:b9:bc:f1:02   -81
    b0:7f:b9:bc:f0:e0   -55
    ec:58:ea:59:a3:53   -89
    b0:7f:b9:bc:f0:40   -69
    b0:7f:b9:bc:f0:42   -67
    00:1d:7e:42:e0:ba   -60
    b0:7f:b9:bc:f0:f0   -63
    b0:7f:b9:bc:f0:50   -72
    b0:7f:b9:bc:f0:f2   -64
    0a:8d:cb:65:6d:70   -85
    06:8d:cb:65:6d:70   -85

This is my code so far

import csv
import json
import pandas as pd

my_csv = pd.read_csv('my_data.csv')
fo = open('my_json.json','w')

wifi = my_csv.wifi

f = pd.read_csv('my_data.csv',usecols=[2])
rss = f.rss

fieldnames = (wifi)
reader = csv.DictReader( f, wifi)
for row in reader:
    json.dump(row, fo, indent = 2)
    fo.write('\n')

this is what I'm getting

"b0:7f:b9:bc:f0:e2": "rss",
"34:a8:4e:fc:13:50": null,
"34:a8:4e:fd:3c:50": null,
"34:a8:4e:fd:3c:53": null,
"34:a8:4e:fc:13:53": null,
"b0:7f:b9:bc:f1:02": null,
"b0:7f:b9:bc:f0:e0": null,
"ec:58:ea:59:a3:53": null,
"b0:7f:b9:bc:f0:40": null,
"b0:7f:b9:bc:f0:42": null,
"00:1d:7e:42:e0:ba": null,
"b0:7f:b9:bc:f0:f0": null,
"b0:7f:b9:bc:f0:50": null,
"b0:7f:b9:bc:f0:f2": null,
"0a:8d:cb:65:6d:70": null,

Answer 1

You are dumping inserting data to json at starting row. Thus it is printing same. You need to append Data. You can append data to any dictionary and dump that complete dictionary to Json

    # Out of Loop
    data = {}

    #Inside Loop
    data.append("What ever Json You want to insert")

    #Outside Loop
    json.dump(data, fo,[other arguments])

Answer 2

with open(file_name, 'w') as jsonfile:
    json.dump(dictionary, jsonfile, indent=4)

Note that this should be used after you have created a dictionary from wifi and rss.

Answer 3

This is one approach.

Demo:

import json
import pandas as pd

my_csv = pd.read_csv('my_data.csv', sep="\s*")
result = {"wifi": {k:v for k, v in my_csv.to_dict('split')["data"]}}

with open('my_json.json', 'w') as outfile:
    json.dump(result, outfile)

Answer 4

since you are using pandas you can use to_json method described here

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.to_json.html

I think for this case the following code should do the trick.

import pandas as pd

dataFrame = pd.read_csv('my_data.csv')
dataFrame.set_index('wifi').to_json('path_of.json')