Python从django url参数解析int

def month_transactions(request,month,year):
    current_month = calculate_current_month(month,year)
    next_month = calculate_next_month(current_month)
    debit_transactions = Transaction.objects.filter(is_credit=False,due_date__range=(current_month,next_month))
    credit_transactions = Transaction.objects.filter(is_credit=True,next_month))
    return render(request,'finances/index.html',{
        'debits': debit_transactions,'credits': credit_transactions,})
def calculate_current_month(month,year):
    current_month = re.match('d{2}',month)
    current_year = re.match('d{4}',year)
    return_month = datetime.date(
        int(current_year.group()),int(current_month.group()),1)
    return return_month

我的URL.conf看起来像：

url(r'^transactions/(?P<month>d{2})/(?P<year>d{4}/$)',views.month_transactions,name='index',),

由于’month’和’year’作为unicode字符串进入month_transactions(年份带有尾随/),因此在从原始变量创建新日期时,我不断获得Type异常.

有没有更好的方法;我错过了内置于Python或Django中的东西？

谢谢,