python计算两个日期相差的天数详解编程语言

#两个日期相隔多少天，例：2008-10-03和2008-10-01是相隔两天  
def datediff(beginDate,endDate):  
    format="%Y-%m-%d";  
    bd=strtodatetime(beginDate,format)  
    ed=strtodatetime(endDate,format)      
    oneday=datetime.timedelta(days=1)  
    count=0 
    while bd!=ed:  
        ed=ed-oneday  
        count+=1 
    return count