Is it a django's bug or something mistaken,when I can't encode chinese characters in django environment?

My environment is python3.3.4 django1.6.2,when I work on a django project,and I need to send email to my users through a email proxy service,but I went wrong with the django's send_mail. So I wrote a function with python's stmplib and email Lib.The code is like:

def email_user(context):

    fromEmail = 'admin@***.cn'  toEmail = ['***@qq.com']  msg = MIMEMultipart('alternative')  msg.set_charset('utf8')  msg['Subject'] = '欢迎注册心优雅社区，请激活您的账号'  msg['From'] = fromEmail  msg['To'] = ','.join(toEmail)  html = """  亲爱的%(username)s:    您好!    您在心优雅社区注册账号时使用了这个邮箱,现在您需要点击下面的链接激活该账号:    %(protocol)s://%(domain)s     如果链接无法点击,请将它完整复制到浏览器的地址栏进行访问.    链接有效期为%(expiration_days)s天,失效后需重新注册.    如果您并未进行过此操作,那么可能是有人误用了您的邮箱,请忽略此邮件."""%context  part = MIMEText(html,'html',_charset='UTF-8')  msg.attach(part)    username = 'postmaster@***org'  password = '****'  s = smtplib.SMTP('****.com:25')  s.login(username,password)  s.sendmail(fromEmail,toEmail,msg.as_string())  s.quit()

When I test it in the python IDLE,it work well. But,when I called this function to send email in my django project,or run it in "manage.py shell",UnicodeEncodeError let me crazy.

'ascii' codec can't encode characters in position 439-441: ordinal not in range(128)  Unicode error hint    The string that could not be encoded/decoded was: 亲爱的

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