CODEWITHSUNDEEP
pythonjsonfiledictionaryappend
peter
peter

Reputation: 41

Python, add dictionary to JSON file

I have JSON file looks like this:

[
  { 
    "lon": 0.0, 
    "altitude": 39000, 
  }, 
  {
    "lon": 0.0, 
    "altitude": 41000, 
   }
]

and I want save this file locally and updates from source file. For example: Refreshed source file have new data:

[
  { 
    "lon": 19.84227, 
    "altitude": 41000, 
  }, 
  {
    "lon": 20.068794, 
    "altitude": 38000, 
  } 
]

how to append local JSON file to add 2 new dictionaries at the end of file to have this:

[
  {
     values
  },
  {
     values
  },          <<< add " , " and new part of dictionaries
  {
     values
  },
  {
     values
  }
[

I trying append JSON files but I have this:

[
 ....
][     << [ and ] must be only at the beggining and end of file
 ....
]

how ?

Upvotes: 2

Views: 4630

Answers (1)

peter
peter

Reputation: 41

I found simple solution:

Append JSON file with new data:

import os, json

with open('data.json', 'a') as fp:
    json.dump(j_data, fp, indent = 2)
fp.close()

f = open('data.json','r')
old_data = f.read()
f.close()

search " ][ " and replace it with " , "

new_data = old_data.replace("][", ",")

save as new file

f = open('data_new.json','w')
f.write(new_data)
f.close()

remove old file and rename new file

os.remove('data.json')
os.rename('data_new.json', 'data.json')

Upvotes: 2

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