Quickstarts explain how to set up and run an app that calls aGoogle Workspace API. This quickstart uses asimplified authentication approach that is appropriate for a testingenvironment. For a production environment, we recommend learning aboutauthentication and authorizationbeforechoosing the access credentialsthat are appropriate for your app.

Create a Python command-line application that makes requests to theDrive Labels API.

Objectives

• Set up your environment.
• Install the client library.
• Set up the sample.
• Run the sample.

Prerequisites

• Python 2.6 or greater
• Thepip package management tool
• A Google Cloud project.

• A Google Account.

Set up your environment

To complete this quickstart, set up your environment.

Enable the API

Before using Google APIs, you need to turn them on in a Google Cloud project.You can turn on one or more APIs in a single Google Cloud project.

• In the Google Cloud console, enable the Drive Labels API.

  Enable the API

Authorize credentials for a desktop application

To authenticate end users and access user data in your app, you need tocreate one or more OAuth 2.0 Client IDs. A client ID is used to identify asingle app to Google's OAuth servers. If your app runs on multiple platforms,you must create a separate client ID for each platform.

1. In the Google Cloud console, go to Menumenu>Google Auth platform>Clients.

   Go to Clients

2. ClickCreate Client.
3. ClickApplication type>Desktop app.
4. In theName field, type a name for the credential. This name is only shown in the Google Cloud console.
5. ClickCreate.

   The newly created credential appears under "OAuth 2.0 Client IDs."

6. Save the downloaded JSON file ascredentials.json, and move the file to your working directory.

Install the Google client library

• Install the Google client library for Python:

  pipinstall--upgradegoogle-api-python-clientgoogle-auth-httplib2google-auth-oauthlib

For alternate installation options, refer to the Python library'sInstallation section.

Configure the sample

1. In your working directory, create a file namedquickstart.py.

2. Include the following code inquickstart.py:

   importos.pathfromgoogle.auth.transport.requestsimportRequestfromgoogle.oauth2.credentialsimportCredentialsfromgoogle_auth_oauthlib.flowimportInstalledAppFlowfromgoogleapiclient.discoveryimportbuildfromgoogleapiclient.errorsimportHttpError# If modifying these scopes, delete the file token.json.SCOPES=['https://www.googleapis.com/auth/drive.labels.readonly']defmain():"""Shows basic usage of the Drive Labels API.    Prints the first page of the customer's Labels.  """creds=None# The file token.json stores the user's access and refresh tokens, and is# created automatically when the authorization flow completes for the first# time.ifos.path.exists('token.json'):creds=Credentials.from_authorized_user_file('token.json',SCOPES)# If there are no (valid) credentials available, let the user log in.ifnotcredsornotcreds.valid:ifcredsandcreds.expiredandcreds.refresh_token:creds.refresh(Request())else:flow=InstalledAppFlow.from_client_secrets_file('credentials.json',SCOPES)creds=flow.run_local_server(port=0)# Save the credentials for the next runwithopen('token.json','w')astoken:token.write(creds.to_json())try:service=build('drivelabels','v2',credentials=creds)response=service.labels().list(view='LABEL_VIEW_FULL').execute()labels=response['labels']ifnotlabels:print('No Labels')else:forlabelinlabels:name=label['name']title=label['properties']['title']print(u'{0}:\t{1}'.format(name,title))exceptHttpErroraserror:# TODO (developer) - Handle errors from Labels API.print(f'An error occurred:{error}')if__name__=='__main__':main()

Run the sample

1. In your working directory, build and run the sample:

   pythonquickstart.py

2. The first time you run the sample, it prompts you to authorize access:

   1. If you're not already signed in to your Google Account, you'reprompted to sign in. If you're signed in to multiple accounts,select one account to use for authorization.
   2. ClickAccept.

   Authorization information is stored in the file system, so the next time yourun the sample code, you aren't prompted for authorization.

You have successfully created your first Python application that makes requests tothe Drive Labels API.

Next steps

• Troubleshoot authentication and authorization issues
• Google APIs Client for Python documentation