Automating pydrive verification process

First, you're misunderstanding one very important bit of how this works:

when I try to use the above script while I am logged into another account. It doesn't upload the eng.txt into my gdrive that generated the secret_client.json but the account that was logged in when I authorize the authentication

This is exactly how it's supposed to work. You, as the developer, distribute client_secret.json with your application, and that file is used by PyDrive to authenticate the application with Google. Google wants to know how many API requests are being made by each application out there for all sorts of reasons (metrics, charge the account, revoke access, etc.), so it requires the application to authenticate itself.

Now, when your application runs LocalWebserverAuth, it's authenticating the client with Google. The client, of course, is the person actually using your application. In this case, the developer and client are the same person (you), but imagine your want to distribute your application to a million different people. They need to be able to authenticate themselves and upload files to their own Drive account, rather that having them all end up in yours (the developer), who provided client_secret.json.

That said, it's really just a very minor change to make it so your app doesn't have to ask the client to authenticate every time you run the app. You just need to use LoadCredentialsFile and SaveCredentialsFile.

from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive

gauth = GoogleAuth()
# Try to load saved client credentials
gauth.LoadCredentialsFile("mycreds.txt")
if gauth.credentials is None:
    # Authenticate if they're not there
    gauth.LocalWebserverAuth()
elif gauth.access_token_expired:
    # Refresh them if expired
    gauth.Refresh()
else:
    # Initialize the saved creds
    gauth.Authorize()
# Save the current credentials to a file
gauth.SaveCredentialsFile("mycreds.txt")

drive = GoogleDrive(gauth)

textfile = drive.CreateFile()
textfile.SetContentFile('eng.txt')
textfile.Upload()
print textfile

drive.CreateFile({'id':textfile['id']}).GetContentFile('eng-dl.txt')

An alternative way is to use a custom auth flow by writing a setting.yaml file into the working directory. And this method works better as LocalWebserverAuth() will generate a token that expires in just one hour and there is no refresh token.

A sample settings.yaml file looks like this

client_config_backend: file
client_config:
    client_id: <your_client_id>
    client_secret: <your_secret>

save_credentials: True
save_credentials_backend: file
save_credentials_file: credentials.json

get_refresh_token: True

oauth_scope:
    - https://www.googleapis.com/auth/drive
    - https://www.googleapis.com/auth/drive.install

With this file, you still have to use a browser to complete authentication for the first time, and after that a credentials.json file will be generated in the working directory with a refresh token.

This method works better if you are trying to automate your script on server