Unable to send the email. Error: (535, b'5.7.8 Username and Password not accepted. Learn more at\n5.7.8 https://support.google.com/mail/?p=BadCredentials ca6sm5778687pjb.48 - gsmtp') code example

Example: Error: Invalid login: 535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials f2sm17674989iop.6 - gsmtp

This code is perfectly worked only need to change in gmail account to access lesssecureapps. https://myaccount.google.com/lesssecureapps ==> On