CSC111 Homework 10 Solution

--D. Thiebaut 19:12, 19 April 2010 (UTC)

---

""" 
hw10a.py
Kristina Fedorenko
Edited by D. Thiebaut
111c-aq
 
Creates a class to keep information about a student.
The class keeps track of the student's name, account number, 
password, and email address.
 
Object issued from this class have methods to
- print the student information (everything we know about a student)
- create a new student with all the information
- get the name of a student
- get the last name of the student <<<==== (new) 
- set the name of the student
- get the account number
- set the account number
- get the password
- get the email
- set the email of the student
"""
import os
 
#--------------------------------------------------------
# original list of students 
#--------------------------------------------------------
text1="""
111c-ca, Liz Cloud, xxyzzyK, lcloud@email.smith.edu
111c-cb, Fiona Poory, ahlhla, fpoory@email.smith.edu
111c-ck, Alex Doe, aluoiid, alexDoe@email.smith.edu
"""

class Student:
    """A class containing student's info"""

    def __init__(self, account, name, passw, email):
        """constructor"""
        self.account = account
        self.name    = name
        self.passw   = passw
        self.email   = email

    def printAll(self):
        """prints out all contained info, with headers"""
        print "account: %-6s name: %-13s pw: %-7s email: %s" %\
              (self.account, self.name, self.passw, self.email)

    def getEmail(self):
        """returns student's email"""
        return self.email

    def setEmail(self, newEmail):
        """changes student's email"""
        self.email = newEmail

    def getName(self):
        """returns student's name"""
        return self.name

    def setName(self, newName):
        """changes student's name"""
        self.name = newName

    def getLastName(self):
        """returns student's last name"""
        lastname = self.name
        lastname = lastname.split()[1]
        return lastname


#--------------------------------------------------------
# parseInput: you are not allowed to change the
#                   code of this function
#--------------------------------------------------------
def parseInput( text ):
    """ parses the original text and creates a list of student objects"""
    lines = text.split( "\n" )
    List = []
    for line in lines:
        words = line.split( ',' )
        if len( words )==4:
            (account, name, passw, email) = words
            #--- create a new object and add it to the list of objects ---
            List.append( Student( account.strip(), name.strip(),\
                                  passw.strip(), email.strip() ) )
    return List

#--------------------------------------------------------  
# students_Sort: sort students alphabetically,
#                by their last name.
# (Note from DT: we haven't see List comprehension
#  yet, but the code below gives you an *example* of 
#  how to create a list out of another list very quickly!)
#--------------------------------------------------------  
def students_Sort(List):
    NewL = [ (stu.getLastName(), stu ) for stu in List ]
    NewL.sort()
    return [ stu for n, stu in NewL ]

#--------------------------------------------------------
# main
#--------------------------------------------------------
def main():
    """ creates a list of students, displays the list, changes the email
    address to reflect new change """
 
    #--- create a list of student objects---
    List = parseInput( text )
 
    #--- display the information for all the students in the list ---
    print "Original List"
    for stu in List:
        stu.printAll()  
 
    #--- Smith college decided to change its email address 
    #--- from "email.smith.edu" to "smithcollege.edu", 
    #--- so all the email addresses currently on record for students
    #--- have to change...
    #--- change all email addresses ---
    for stu in List:
        email = stu.getEmail().replace( "email.smith.edu", "smithcollege.edu" )
        stu.setEmail( email )
 
    #--- show the list again ---
    print "\n\nNew List after change of email address"
    for stu in List:
        stu.printAll() 
 
    #--- user Fiona Poory has changed her last name to Litmus... 
    # her record must be changed ---
    for stu in List:
        if stu.getName().find( "Fiona" )!= -1 and\
           stu.getName().find( "Poory" )!=-1:
             stu.setName( "Fiona Litmus" )
             email = stu.getEmail()
             email = email.replace( "fpoory", "flitmus" )
             stu.setEmail( email )
 
    #--- show the list again ---
    print "\n\nNew List after change of name"
    for stu in List:
        stu.printAll() 
 
    #--- a new student has just joined Smith ---                              
    List.append(  Student( "111c-bz", "Rachel Maddow",\
                           "msnbcms", "rmaddow@smithcollege.edu" ) )
 
    #--- show the list again ---                                              
    print "\n\nNew List after addition of student"
    for stu in List:
       stu.printAll()

    SortedStu = students_Sort(List)
    print "\n\nStudents sorted alphabetically"
    for stu in SortedStu:
        stu.printAll()

main()