import firebase_admin
from firebase_admin import credentials
from firebase_admin import storage

# Import UUID4 to create token
from uuid import uuid4

cred = credentials.Certificate("path/to/your/service_account.json")
default_app = firebase_admin.initialize_app(cred, {
    'storageBucket': '.appspot.com'
})

bucket = storage.bucket()
blob = bucket.blob(img_src)

# Create new token
new_token = uuid4()

# Create new dictionary with the metadata
metadata  = {"firebaseStorageDownloadTokens": new_token}

# Set metadata to blob
blob.metadata = metadata

# Upload file
blob.upload_from_filename(filename=img_path, content_type='image/png')