gistfile1.py

#/usr/bin/python
# -*- encoding:utf8 -*-

import mechanize

br = mechanize.Browser()
br.set_handle_robots(False)
url='http://mixi.jp'
username="<your email>"
password="<your password>"
mixi_id=<your id-number>

def login():
    try:
        br.open(url)
        br.select_form(name="login_form")
        br["email"] = username
        br["password"] = password
        br.submit()
        return True
    except:
        return False

def write(title,body):
    br.open('http://mixi.jp/add_diary.pl?id=%u&send_from=home' % mixi_id)
    br.select_form(name="diary")
    br["diary_title"] = title.encode(br.encoding())
    br["diary_body"] = body.encode(br.encoding())
    res=br.submit()
    print res.geturl()
    br.submit()


if login() : print "Login OK"
elif print "Login Failure"

write("test","hello")