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Lecture 28

Lecture 28. More classes that use classes. Review of the Employee Class. Class Employee The data members were Name # a string hourlyRate #a floating point number Dept #a character like “H” The methods getName (self) g et hourlyRate (self) getDept (self)

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Lecture 28

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  1. Lecture 28 More classes that use classes

  2. Review of the Employee Class • Class Employee • The data members were • Name # a string • hourlyRate #a floating point number • Dept #a character like “H” • The methods • getName(self) • get hourlyRate(self) • getDept(self) • setRate(self) • setDept(self) • calc_pay(self,nHrs)

  3. Write calc_paychecks() • This function is not a member of the Employee class • It has two parameters: • A list of members of the Employee class • A list of exactly the same size which contains the hours worked by the corresponding employee

  4. getEmployees_by_rate() • This function takes two parameters • A list of Employee objects • A specified pay rate • This function returns a list of Employee objects – each is a copy of one of the Employee objects in the original list who has a pay rate greater than or equal to the specified one.

  5. Back to the Course Class

  6. class Course: def __init__(self, dept, code, max,hrs, aTitle): def __str__(self): s = self.dept + self.nbr + " " + self.title return s def get_dept(self): def get_nbr(self): def get_max(self): def get_hrs(self): def get_count(self): def get_students(self): def add_student(self, name):

  7. A program to create a list of Courses import course import string def main(): courseList = [] infile = open("courseData.txt", "r") for line in infile: data = line.split() title = string.join(data[4:]) c = course.Course(data[0], data[1],data[3], data[2],title) courseList.append(c) print item main()

  8. The Registrar Class • What data does the registrar need? • A list of available courses • What operations should the registrar have on this list • Process a student request for courses • Find a course in this list by dept and number • Add a student to a course • Delete a student from a course

  9. The constructor • def __init__(self, filename): • #initialize the course list by reading all the details from the file name filename

  10. The constructor • def __init__(self, filename): • self.courseList = [] • infile = open(filename, "r") • for line in infile: • data = line.split() • title = string.join(data[4:]) • c =Course(data[0], data[1],data[3], data[2],title) • self.courseList.append(c)

  11. The only “get” • def getList(self): • return self.courseList

  12. find_course() • def find_course(self, dept, nbr): • #return the Course object whose department and number match the parameters

  13. find_course() • def find_course(self, dept, nbr): • for item in self.courseList: • if item.get_dept()==dept and item.get_nbr()== nbr: • return item

  14. add_student() • def add_student(self, dept, nbr, name): • #add the student with the name “name” to the • #course whose department and number match the parameters

  15. add_student() • def add_student(self, dept, nbr, name): • c = self.find_course(dept,nbr) • c.add_student(name)

  16. process_request() • def process_request(self, cList, sName): # this has two parameters, cList which looks like [(“CSC”, “117”), (“ECO”, “210”), (“BIO”, “110”)] and the name of the student. The function puts the student into each course in the list.

  17. process_request() • def process_request(self, cList, sName): • for (x,y) in cList: • self.add_student(x, y, sName)

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