import smtplib
from getpass import getpass
from email.mime.text import MIMEText

sender = 'example_sender@gmail.com'
receiver = 'example_receiver@gmail.com'

content = """The receiver will see this message.
            Best regards"""

msg = MIMEText(content)
msg['From'] = sender
msg['To'] = receiver
msg['Subject'] = 'Simple app script'

with open('/path/to/your/file', 'r') as file:
    content = file.read()

smtp_server_name = 'smtp.gmail.com'
#port = '465' # for secure messages
port = '587' # for normal messages

if port == '465':
    server = smtplib.SMTP_SSL('{}:{}'.format(smtp_server_name, port))
else :
    server = smtplib.SMTP('{}:{}'.format(smtp_server_name, port))
    server.starttls() # this is for secure reason

server.login(sender, getpass(prompt="Email Password: "))
server.send_message(msg)
server.quit()