from goody import irange, type_as_str class Date: month_dict = {1:31, 2:28, 3:31

Question

from goody import irange, type_as_str

class Date:
month_dict = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}

@staticmethod
def is_leap_year(year):
return (year%4 == 0 and year%100 != 0) or year%400 == 0
  
@staticmethod
def days_in(year,month):
return Date.month_dict[month] + (1 if month == 2 and Date.is_leap_year(year) else 0)

def __init__(self, y, m, d):
  
self.year = y
self.month = m
self.day = d

# Test __len__
e-->len(Date(0,1,1))-->0
e-->len(Date(0,12,31))-->365
e-->len(Date(0,3,14))-->73
e-->len(Date(1,1,1))-->366
e-->len(Date(1900,1,1))-->693961
e-->len(Date(1912,4,15))-->698448
e-->len(Date(1969,7,20))-->719363
e-->len(Date(2000,1,1))-->730485
e-->len(Date(2016,4,15))-->736434

1. (20 pts) Complete the class Date, which stores and manipulates dates. As specified below, write the required methods, including those needed for overloading operators. Exceptions messages should include the class and method names, and identify the error (including the value of all relevant arguments). Hint see the type as_str function in the goody py module. You may not import/use the datetime or other similar modules in Python.

Explanation / Answer

1.

from goody import irange,type_as_str

class Date:

month_dict = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31,11:30, 12:31}

@staticmethod

def is_leap_year(year):

return (year%4 == 0 and year%100 != 0) or year%400 == 0

@staticmethod

def days_in(year,month):

return Date.month_dict[month] + (1 if month == 2 andDate.is_leap_year(year) else 0)

def __init__(self,year,month,day):

assert type(year) is int and year >= 0,'Date.__init__:year('+str(year)+') is not positive'

assert type(month) is int and 1 <= month <= 12, 'Date.__init__:month('+str(month)+') is not int in range [1,12]'

assert type(day) is int and 1 <= day <= Date.days_in(year,month),'Date.__init__: days('+str(day)+') is not correct for month('+str(month)+')/year('+str(year)+')'

self.year= year

self.month = month

self.day= day

def __getitem__(self,index):

if type(index) is not tuple:

index =(index,)

if not all(type(i) is str and i in ('y','m','d') for i in index):

raise IndexError('Date.__getitem__: illegal argument in'+str(index))

answer = tuple(self.year if i=='y' else self.month if i=='m' elseself.day for i in index)

if len(answer)==1:

answer = answer[0]

return answer

def __repr__(self):

return 'Date('+','.join(str(part) for part in self['y','m','d'])+')'

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.