Source Code: Create a Python Program To Delete Gmail Emails

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import time
from google_apis import create_service

CLIENT_FILE = 'client-secret.json'
API_NAME = 'gmail'
API_VERSION = 'v1'
SCOPES = ['https://mail.google.com/']

gmail_service = create_service(CLIENT_FILE, API_NAME, API_VERSION, SCOPES)

# step 1. Serach emails
def search_emails(query, labels=None):
    # email_messages = []
    next_page_token = None
    
    message_response = gmail_service.users().messages().list(
        userId='me',
        labelIds=labels,
        includeSpamTrash=False,
        q=query,
        maxResults=500
    ).execute()
    email_messages = message_response.get('messages')
    next_page_token = message_response.get('nextPageToken')

    while next_page_token:
        message_response = gmail_service.users().messages().list(
            userId='me',
            labelIds=labels,
            q=query,
            maxResults=500,
            includeSpamTrash=False,
            pageToken=next_page_token
        ).execute()
        email_messages.extend(message_response['messages'])
        next_page_token = message_response.get('nextPageToken')
        print('Page Token: {0}'.format(next_page_token))
        time.sleep(0.5)
    return email_messages

query_string = "subject:Delete This "
email_results = search_emails(query_string)

# Step 2. delete emails
for email_result in email_results:
    gmail_service.users().messages().trash(
        userId='me',
        id=email_result['id']
    ).execute()