CSC11 Homework 10 Solution Programs 2014

--D. Thiebaut (talk) 06:53, 23 April 2014 (EDT)

---

Program 1

# hw10a.py
# Joyce Xue ( aa )
# (slightly edited by D. Thiebaut)
# 04.15.2014
#
# This program contains a class Cat that describe a cat with its name, age,
# being vaccinated or not, being neutered or not and breed
#
# To create an object of this type, simply use the constructor, as follows:
#
#        cat = Cat(name, age, vaccinated, neutered, breed)
#
# The methods supported are:
#
# isVaccinated(): returns if the cat is vaccinated
#
# isNeutered(): returns the  name of the planet with the largest diameter
#
# __str__(): convert the object to a string
# ------------------------------------------------------------------------------------------------------
class Cat:
    # contructor. Initialize all memebers.
    def __init__( self,name, age, vaccinated, neutered, breed):
        self._name=name
        self._age=age
        self._vac=vaccinated
        self._neu=neutered
        self._breed=breed

    #==================================================================
    # __str__() : When call print(cat), this function
    #                      automatically converts the cat to a string
    #==================================================================
    def __str__(self):
        # make up the return string by following the required format
        temp = "Cat: "+self._name+","+" age: "+str(self._age)+", "

        # convert boolean value to string
        if self._vac: temp=temp+"vaccinated, "
        else: temp=temp+"not vaccinated, "

        if self._neu: temp=temp+"neutered "
        else: temp=temp+"not neutered "

        temp=temp+"("+self._breed+")"
        
        return temp

    #==================================================================
    # isVaccinated(): return if the cat is vaccinated
    #==================================================================
    def isVaccinated(self):
        return self._vac

    #==================================================================
    # isNeutered(): return if the cat is neutered
    #==================================================================
    def isNeutered(self):
        return self._neu


#==================================================================
# getNewCat(): ask for user input to create a new
#                       cat and return it
#==================================================================
def getNewCat():
    # user input for name, age, if vaccinated, if neutered and breed
    print( "\nPlease enter the information for the new cat:")
    name = input(       "Cat name?         " )
    age  = int( input(  "Age, in years?    " ) )
    vac  = input(       "Vaccinated (Y/N)? " ).strip().lower()
    vac  = vac in ['y', 'yes']
    neut = input(       "Neutered (Y/N)?   " ).strip().lower()
    neut = neut in ['y', 'yes' ]
    breed= input(       "Breed?            " ).strip()
    
    return Cat( name, age, vac, neut, breed )

#==================================================================
# display(): print each cat in a Cat collection
# L       - a list of cats
# caption - the subject of the list to be printed
#==================================================================
def display( L, caption ):
    # print the subject
    print( "\n\n"+caption )
    print( "=" * len( caption ) )
    # go over the list and print each cat's info
    for cat in L:
        print( cat )

#==================================================================
# main(): 
#  * creates a list of cat objects, displays it.
# 
#==================================================================
def main():
    # inital cats' info
    text="""Minou, 3, Yes, Yes, stray
            Max, 1, Yes, No, Burmese
            Gizmo, 2, No, No, Bengal
            Garfield, 4, Yes, Yes, Orange Tabby"""

    # use the text as the initial data, generate cats
    for line in text.split( "\n" ):
        # split each line into items
        words = line.strip().split( "," )
        # if data is not exactly 5, skip
        if len( words ) != 5:
            continue
        # set items to variables
        name, age, vaccinated, neutered, breed = words
        # convert age to int
        age = int( age.strip() )
        # convert user inputs to booleans
        if vaccinated.strip().lower() == "yes":
            vaccinated = True
        else:
            vaccinated = False

        neutered = neutered.strip().lower() == "yes"

        # construct a cat
        cat = Cat( name.strip(), age, vaccinated, neutered, breed.strip() )

        try:
            # add the cat to the list
            cats.append( cat )
        except NameError:
            # if the cats list is not initialized, initialize it and append the first cat
            cats = []
            cats.append( cat )

    # output the cat list
    display( cats, "List of cats:" )

    # let user input a new cat's info and append it into the list
    cats.append( getNewCat() )

    # output the list again
    display( cats, "List of cats with new addition:" )

    # -------------------------------------------------------------------
    # Code Addition
    # -------------------------------------------------------------------
    # Go through each cat and add those who is both vaccinated and neutered into a list
    vaccinatedNeuteredCats = []
    for cat in cats:
        if cat.isVaccinated() and cat.isNeutered():
            vaccinatedNeuteredCats.append( cat )

    # output the cats in this new list (both vaccinated and neutered)
    display( vaccinatedNeuteredCats, "Vaccinated and neutered cats:" )

    
# Main entry point for the program
main()