Google API quickstart.py error KeyError: '_module'

问题

Using Gmail API. My client secret file is downloaded and working for Ruby. When I try the quickstart.py (python) version I get this error

File "quickstart.py", line 70, in <module>
    main()
  File "quickstart.py", line 55, in main
    credentials = get_credentials()
  File "quickstart.py", line 38, in get_credentials
    credentials = store.get()
  File "/Library/Python/2.7/site-packages/oauth2client/client.py", line 374, in get
    return self.locked_get()
  File "/Library/Python/2.7/site-packages/oauth2client/file.py", line 79, in locked_get
    credentials = Credentials.new_from_json(content)
  File "/Library/Python/2.7/site-packages/oauth2client/client.py", line 281, in new_from_json
    module = data['_module']
KeyError: '_module'

I have not changed the file at all, just added the client_secret.json to that working directory and also install the google-api-python-client. My python code came from here: https://developers.google.com/gmail/api/quickstart/python

回答1:

oauth2client is trying to load credentials from a json file with an incorrect structure.

Maybe the Ruby client uses a different file format but I'd be surprised. Are you sure you didn't save client_secret.json as ~/.credentials/gmail-quickstart.json accidentally?

Regardless, removing ~/.credentials/gmail-quickstart.json and re-authenticating will generate a new credentials file with the correct structure.

回答2:

Try replacing creds = store.get() with creds = None temporarily. If this works, you can refactor your code to always start with flow-based credentials instantiation. This worked for me. It seems Google samples are out of sync with their oauth2client.

回答3:

I am learning Python myself and had a similar problem, but with the Calendar API example. It turned out that it was a typo with regards to the SCOPE.

## Typo - Invalid definition
SCOPES = 'https://ww.googleapies.com/auth/calendar.readonly'
## Correct Value for SCOPE
SCOPES = 'https://www.googleapis.com/auth/calendar'

Also, Matt's answer help point me in the right direction. The gmail-quickstart.json is not the same thing as the client_secret.json. The client_secret.json allows you to make a request for an OAuth2 token. While the gmail-quickstart.json contains the issued token and meta-data associated with it. The gmail-quickstart.json isn't created until you successfully login.

One last thought, in order to log in successfully, the quickstart.py app launched an instance of my web-browser (Firefox) and went to the Google login screen. In order for Firefox to run properly, I had to set my DISPLAY variable properly first.

$ export DISPLAY=:0
$ xhost +
access control disabled, clients can connect from any host

回答4:

I solved this by moving the client_secret.json to the same directory as the py file that is trying to read it (quickstart.py), mine was on the Desktop while i had saved the json to Documents. I saved the json to the Desktop too and boy, It flew!.

I dont know why it doesnt work when they are in different directories, defining a custom credential_path doesn't help.

回答5:

I followed several recommendations listed here:

moving the client_secret.json to the same directory as the py file that is trying to read it, as recommended by simic0de.
Working with skirill idea, instead of completely eliminating the 'credentials=store.get()', I decided to handle the exception, so it would work with flow-based credentials instantiation.

The final code is:

try:
    credentials = store.get()
except:
    print('Working with flow-based credentials instantiation')

You can write your own code in the except line. This approach will allow the store.get() command to work when conditions are met.

来源：https://stackoverflow.com/questions/30966906/google-api-quickstart-py-error-keyerror-module

标签

python

google-api

gmail-api