What's the best way to send an e-mail via Python Google Cloud Function?

I'm trying to write a Python Google Cloud Function to send an automated e-mail to the same G-mail address at the same time every day (e.g. every day at 00:00). What's the easiest way to accomplish this? I couldn't find any online tutorials or guidance in the online documentation...Thanks in advance!

Here's what I've tried so far but neither approach seems to work (real e-mail addresses, passwords and API keys hidden for obvious reasons)

Approach 1: Using smtplib (function body)

import smtplib

gmail_user = 'SenderEmailAddress@gmail.com'
gmail_password = 'SenderEmailPassword'

sent_from = gmail_user
to = ['RecipientEmailAddress@gmail.com']
subject = 'Test e-mail from Python'
body = 'Test e-mail body'

email_text = """\
From: %s
To: %s
Subject: %s

%s
""" % (sent_from, ", ".join(to), subject, body)

server = smtplib.SMTP_SSL('smtp.gmail.com', 465)
server.ehlo()
server.login(gmail_user, gmail_password)
server.sendmail(sent_from, to, email_text)
server.close()
print('Email sent!')

Approach 2: Using SendGrid API (function body)

import os
from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import Mail

message = Mail(
    from_email='SenderEmailAddress@gmail.com',
    to_emails='RecipientEmailAddress@gmail.com',
    subject='Sending with Twilio SendGrid is Fun',
    html_content='<strong>and easy to do anywhere, even with Python</strong>')

try:
    sg = SendGridAPIClient("[SENDGRID API KEY]")
    #sg = SendGridAPIClient(os.environ.get('SENDGRID_API_KEY'))
    response = sg.send(message)
    print(response.status_code)
    print(response.body)
    print(response.headers)
except Exception as e:
    print(e.message)