In this assignment you’ll practice
datetime.date objects in Python,You are writing a web application to manage a database of students.
Write a module named students with the classes and functions specified below.
Student
Write a class called Student with the following instance variables:
id: str – 9-digit student IDlogin: str – login IDfirst_name: strlast_name: strbirth_date: datetime.datemajor: strhours: int – number of completed semester hoursThese instance variables should all be initialized when you create an instance of Student.
In addition, implement the following methods:
A magic method that gives instances of Student a str representation, whether by passing an instance to the str() function or echoing the value of an instance in the REPL. See the examples below for the format of this string representation.
A magic method that makes it possible to compare two instances of Student for equality using operator == – two instances of Student are equal if all of their instance variables are equal,
A magic method that makes it possible to compare two instances of Student using operator <. A Student is “less than” another if their completed semster hours is less than the other Student’s completed semester hours. If both students have the same hours, then a younger student is “less than” the other.
An instance method named age that that takes no parameters (other than self) and returns the Student’s age in years.
datetime.timedelta class due to leap years. It’s probably easier to use a different approach.An instance method named year that takes no parameters (other than self) and returns the year of the student based on the student’s number of hours according to the rule that a student with less than 30 hours is a first-year student, a student with $\ge$ 30 and $<$ 60 is a second year student, and so on.
mk_students_dict
Write a function called mk_students_dict which takes a list of Student instances and returns a dictionary mapping student IDs to the Student instance having that ID. If the list contains multiple Student instances with the same ID, raise an exception with the message “Duplicate Student instances with id XXXXXXXXX”, where XXXXXXXXX is the duplicate student ID.
graduating
Write a function called graduating which takes a dictionary mapping student IDs to Student instances (like the one returned by mk_students_dict) and returns a list containing all the instances of Student with more than 115 hours.
doctestInclude the docstring below as a module docstring in your students module so that you can test your code using the doctest module.
python -m doctest -v students.py
Take a look at these doctests. Are there any edge cases that aren’t tested?
>>> import datetime as dt
>>> cartman = Student("123456789", "ecartman3", "Eric", "Cartman", dt.date(2009, 7, 1), "BA", 80)
>>> kenny = Student("223456789", "kmccormick3", "Kenneth", "McCormick", dt.date(2009, 4, 10), "STAC", 80)
>>> stan = Student("323456789", "smarsh3", "Stanley", "Marsh", dt.date(2009, 10, 19), "IE", 85)
>>> kyle = Student("423456789", "kbroflovski3", "Kyle", "Broflovski", dt.date(2009, 5, 26), "CS", 85)
>>> cartman
<Eric Cartman (123456789, ecartman3), a 9 year-old 3rd-year BA major>
>>> str(cartman)
'<Eric Cartman (123456789, ecartman3), a 9 year-old 3rd-year BA major>'
>>> stan == kyle
False
>>> stan2 = Student("323456789", "smarsh3", "Stanley", "Marsh", dt.date(2009, 10, 19), "IE", 85)
>>> stan is stan2
False
>>> stan == stan2
True
>>> cartman < kenny
True
>>> stan < kenny
False
>>> cartman.age()
9
>>> cartman.year()
3
>>> boys = [cartman, kenny, stan, kyle]
>>> boys_dict = {"123456789": cartman, "223456789": kenny, "323456789": stan, "423456789": kyle}
>>> mk_students_dict(boys) == boys_dict
True
>>> bebe = Student("987654321", "bstevens3", "Barabara", "Stevens", dt.date(2009, 5, 5), "EE", 116)
>>> heidi = Student("887654321", "hturner3", "Heidi", "Turner", dt.date(2009, 6, 2), "PHYS", 117)
>>> annie = Student("787654321", "aknitts3", "Annie", "Knitts", dt.date(2010, 1, 25), "ME", 115)
>>> wendy = Student("687654321", "wtestaburger3", "Wendy", "Testaburger", dt.date(2009, 10, 2), "AE", 114)
>>> girls = [bebe, heidi, annie, wendy]
>>> graduating(mk_students_dict(boys + girls))
[<Barabara Stevens (987654321, bstevens3), a 9 year-old 4th-year EE major>, <Heidi Turner (887654321, hturner3), a 9 year-old 4th-year PHYS major>]
>>> try:
... mk_students_dict([cartman] + boys)
... except Exception as e:
... print(str(e))
...
Multiple students with 123456789
datetime module