如何解决Python-从出生日期获取员工年龄的类?
import datetime
class Employee:
def __init__ (self,first,last,pay,dob):
self.first = first
self.last = last
self.pay = pay
self.email = first + "." + last + "@company.com"
self.dob = dob
def fullname(self):
return '{} {}'.format(self.first,self.last)
def age(dob):
today = date.today()
return today.year - dob.year - ((today.month,today.day) < (dob.month,dob.day))
emp1 = Employee("aa","ss",122,date(1991,2,3))
emp2 = Employee("ww","ii",637,date(1997,8,24))
emp3 = Employee("ee","oo",986,date(1986,10,19))
#driver code
print(Employee.age(emp2))
我收到以下错误:
AttributeError:“雇员”对象没有属性“年份”
这有什么不对?
解决方法
您的Employee.age()
方法签名只有一个参数-dob
。调用它时,传递的第一个参数是实例。按照约定,我们使用参数self
。但是您使用dob
。遵循惯例,就像使用其他方法一样。然后使用self.dob.year
from datetime import date
class Employee:
def __init__ (self,first,last,pay,dob):
self.first = first
self.last = last
self.pay = pay
self.email = first + "." + last + "@company.com"
self.dob = dob
@property
def fullname(self):
return '{} {}'.format(self.first,self.last) # in 3.6 return f'{self.first} {self.last}'
def age(self):
today = date.today()
return today.year - self.dob.year - ((today.month,today.day) < (self.dob.month,self.dob.day))
emp1 = Employee("aa","ss",122,date(1991,2,3))
emp2 = Employee("ww","ii",637,date(1997,8,24))
emp3 = Employee("ee","oo",986,date(1986,10,19))
#driver code
print(emp1.age())
注意,我还添加了@property装饰器,因此全名是“只读”属性 并修复了导入
在3.6及更高版本中,您可以使用f字符串。 age
和e-mail property
,例如fullname
可能是只读属性(即,您不应该指定与dob
相矛盾的年龄),例如
@property
def age(self):
today = date.today()
return today.year - self.dob.year - ((today.month,self.dob.day))
然后您可以像这样使用它
print(emp1.age) # note the difference when it is method in the original class,and now when its property
,
您的employee
类没有年份属性
但是
employee.dob
拥有
import datetime
from datetime import date
class Employee:
def __init__ (self,dob):
self.first = first
self.last = last
self.pay = pay
self.email = first + "." + last + "@company.com"
self.dob = dob
def fullname(self):
return '{} {}'.format(self.first,self.last)
def age(dob):
today = date.today()
dob = dob.dob # get dob from the object(of employee class) <<<<< Single change
return today.year - dob.year - ((today.month,today.day) < (dob.month,dob.day))
emp1 = Employee("aa",19))
#driver code
print(Employee.age(emp2))
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