python - dateNow = datetime.datetime.now() 导致 AttributeError : type object 'datetime.datetime' has no attribute 'datetime' "while calculating age

Question

尝试找出如何将当前日期锁定为变量，以从输入的 self.birthday 中减去。我已经查看了各种示例和链接，但无济于事......建议？

from datetime import datetime
import time

class Person(object):
    def __init__(self, name):
        self.name = name
        self.birthday = None


#getName returns the name of the person         
    def getName(self):
        return self.name

#setBirthday sets their Birthday to a date
    def setBirthday(self):
        day = raw_input('Please enter the date of the month you were born on here ->')
        month = raw_input('Please enter the month of the year you were born on here ->')
        year = raw_input('Please enter the year you were born on here ->')
        self.birthday = int(day),  int(month), int(year)
        print self.birthday

#getAge returns how many days old the individual is     
    def getAge(self):
        dateNow = datetime.datetime.now()
        dateBirth = self.birthday
        timedelta = dateNow - dateBirth
        timedelta = self.daysOld
        print self.daysOld

错误消息是“dateNow = datetime.datetime.now()AttributeError:类型对象“datetime.datetime”没有属性“datetime””

我尝试过以下方法

datetime.date.today() 

没有成功

我正在使用的资源:

https://docs.python.org/3/library/datetime.html

https://pymotw.com/2/datetime/

Answer 1

datetime.datetime.now() 引用库(第一个 datetime)的类(第二个datetime)的方法(now) datetime)，但是您没有导入整个库，而只是导入单个类(from datetime import datetime)。导入整个库或调用该类而不引用该库。