test4.py

import os
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
import base64

SCOPES = ['https://www.googleapis.com/auth/gmail.send']
creds = None
GOOGLE_APPLICATION_CREDENTIALS='1062932443234260-basxascscij6dCsncvkpZC3r8o2or.apps.googleusercontent.com'

if os.path.exists('token.json'):
    creds = Credentials.from_authorized_user_file('token.json')

if not creds or not creds.valid:
    print("Invalid or expired credentials. Please re-authenticate.")

service = build('gmail', 'v1', credentials=creds)

message = MIMEMultipart()
message['to'] = 'recipient@example.com'
message['subject'] = 'Subject of the email'

body = 'Body of the email'
message.attach(MIMEText(body, 'plain'))

raw_message = base64.urlsafe_b64encode(message.as_bytes()).decode('utf-8')

try:
    sent_message = service.users().messages().send(userId='me', body={'raw': raw_message}).execute()
    print('Email sent successfully!')
except Exception as error:
    print(f'An error occurred: {error}')