Custom filetype in Python 3

Try this:

from zipfile import ZipFile
import json

data = json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}])

with ZipFile('foo.filetype', 'w') as myzip:
    myzip.writestr('digest.json', data)

The file is now a zip archive with a json file (thats easy to read in again in many lannguages) for data you can add files to the archive with myzip write or writestr. You can read data back with:

with ZipFile('foo.filetype', 'r') as myzip:
    json_data_read = myzip.read('digest.json')
    newdata = json.loads(json_data_read)

Edit: you can append arbitrary data to the file with:

f = open('foo.filetype', 'a')
f.write(data)
f.close()

this works for winrar but python can no longer process the zipfile.

Use this:

import base64
import gzip
import ast

   
def save(data):
    data = "[{}]".format(data).encode()
    data = base64.b64encode(data)
    return gzip.compress(data)

def load(data):
    data = gzip.decompress(data)
    data = base64.b64decode(data)
    return ast.literal_eval(data.decode())[0]

How to use this with file:

open(filename, "wb").write(save(data)) # save data

data = load(open(filename, "rb").read()) # load data

This might look like this is able to be open with archive program but it cannot because it is base64 encoded and they have to decode it to access it.

Also you can store any type of variable in it! example:

open(filename, "wb").write(save({"foo": "bar"})) # dict
open(filename, "wb").write(save("foo bar")) # string
open(filename, "wb").write(save(b"foo bar")) # bytes

# there's more you can store!

This may not be appropriate for your question but I think this may help you.

I have a similar problem faced... but end up with some thing like creating a zip file and then renamed the zip file format to my custom file format... But it can be opened with the winRar.