br = Browser()
br.set_handle_robots(False)

userName = 'My EmailID'
password = 'My Password'
response = br.open('https://www.facebook.com/')
if response.code is 200:
    loginForm = br.forms()[0]
    loginForm.set_value(userName, type='email')
    loginForm.set_value(password, type="password")
    response = loginForm.click(type='submit')

br = Browser()
br.set_handle_robots(False)

userName = 'My EmailID'
password = 'My Password'
response = br.open('https://www.facebook.com/')
if response.code is 200:
    br.select_form(nr=0)
    br.set_value(userName, type='email')
    br.set_value(password, type="password")
    response = br.submit()