Python quickstart

Quickstarts explain how to set up and run an app that calls a Google Workspace API. This quickstart uses a simplified authentication approach that is appropriate for a testing environment. For a production environment, we recommend learning about authentication and authorization before choosing the access credentials that are appropriate for your app.

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

Objectives

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

Prerequisites

Python 2.6 or greater
The pip 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 to create one or more OAuth 2.0 Client IDs. A client ID is used to identify a single app to Google's OAuth servers. If your app runs on multiple platforms, you must create a separate client ID for each platform.

In the Google Cloud console, go to Menu > Google Auth platform > Clients .
Go to Clients
Click Create Client .
Click Application type > Desktop app .
In the Name field, type a name for the credential. This name is only shown in the Google Cloud console.
Click Create .
The newly created credential appears under "OAuth 2.0 Client IDs."
Save the downloaded JSON file as credentials.json , and move the file to your working directory.

Install the Google client library

Install the Google client library for Python:

  pip 
 install 
 -- 
 upgrade 
 google 
 - 
 api 
 - 
 python 
 - 
 client 
 google 
 - 
 auth 
 - 
 httplib2 
 google 
 - 
 auth 
 - 
 oauthlib

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

Configure the sample

In your working directory, create a file named quickstart.py .

Include the following code in quickstart.py :

  import 
  
 os.path 
 from 
  
 google.auth.transport.requests 
  
 import 
 Request 
 from 
  
 google.oauth2.credentials 
  
 import 
 Credentials 
 from 
  
 google_auth_oauthlib.flow 
  
 import 
 InstalledAppFlow 
 from 
  
 googleapiclient.discovery 
  
 import 
 build 
 from 
  
 googleapiclient.errors 
  
 import 
 HttpError 
 # If modifying these scopes, delete the file token.json. 
 SCOPES 
 = 
 [ 
 'https://www.googleapis.com/auth/drive.labels.readonly' 
 ] 
 def 
  
 main 
 (): 
  
 """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. 
 if 
 os 
 . 
 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. 
 if 
 not 
 creds 
 or 
 not 
 creds 
 . 
 valid 
 : 
 if 
 creds 
 and 
 creds 
 . 
 expired 
 and 
 creds 
 . 
 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 run 
 with 
 open 
 ( 
 'token.json' 
 , 
 'w' 
 ) 
 as 
 token 
 : 
 token 
 . 
 write 
 ( 
 creds 
 . 
 to_json 
 ()) 
 try 
 : 
 service 
 = 
 build 
 ( 
 'drivelabels' 
 , 
 'v2' 
 , 
 credentials 
 = 
 creds 
 ) 
 response 
 = 
 service 
 . 
 labels 
 () 
 . 
 list 
 ( 
 view 
 = 
 'LABEL_VIEW_FULL' 
 ) 
 . 
 execute 
 () 
 labels 
 = 
 response 
 [ 
 'labels' 
 ] 
 if 
 not 
 labels 
 : 
 print 
 ( 
 'No Labels' 
 ) 
 else 
 : 
 for 
 label 
 in 
 labels 
 : 
 name 
 = 
 label 
 [ 
 'name' 
 ] 
 title 
 = 
 label 
 [ 
 'properties' 
 ][ 
 'title' 
 ] 
 print 
 ( 
 u 
 ' 
 {0} 
 : 
 \t 
 {1} 
 ' 
 . 
 format 
 ( 
 name 
 , 
 title 
 )) 
 except 
 HttpError 
 as 
 error 
 : 
 # TODO (developer) - Handle errors from Labels API. 
 print 
 ( 
 f 
 'An error occurred: 
 { 
 error 
 } 
 ' 
 ) 
 if 
 __name__ 
 == 
 '__main__' 
 : 
 main 
 ()

Run the sample

In your working directory, build and run the sample:
```
  python 
 quickstart 
 . 
 py 
 
```
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're prompted to sign in. If you're signed in to multiple accounts, select one account to use for authorization.
2. Click Accept.
Authorization information is stored in the file system, so the next time you run the sample code, you aren't prompted for authorization.

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

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