I'm trying to sort a list of students from a text file in python(3.7) with three separate sorting functions (Bubble, selection, insert) I'm not sure to why as its not working I'm going to guess its because I'm not using the swap function I built. Every time I run it though I get an error that says the following Traceback (most recent call last): File "C:/Users/tkoto/Desktop/SearchAndSortLab.py", line 146, in <module> main() File "C:/Users/tkoto/Desktop/SearchAndSortLab.py", line 122, in main studentArray.gpaSort() File "C:/Users/tkoto/Desktop/SearchAndSortLab.py", line 65, in gpaSort if maxgpa[gpa1][2] < maxgpa[gpa2][2]: TypeError: 'Person' object does not support indexing Current Code: class Person(object): def __init__(self, name, ID, age, gpa): self.name = name self.id = ID self.age = age self.gpa = gpa def __str__(self): output = "\n\nStudent Record for ID# {}\n".format(self.id) output += "Name: {} \nAge: {} \nGPA: {}".format(self.name, self.age, self.gpa) return output #################################################################################################### class List(object): def __init__(self): self.studentList = [] self.getList() def getList(self): try: file = open("students.txt", "r") name = file.readline().rstrip("\n") while len(name) != 0: id = int(file.readline().rstrip("\n")) age = int(file.readline().rstrip("\n")) gpa = float(file.readline().rstrip("\n")) self.studentList.append(Person(name, id, age, gpa)) name = file.readline().rstrip("\n") except: print("File could not be opened") def spaces(self, name): tab = 24 - len(name) temp = '' for j in range(tab): temp += " " return temp def displayStudent(self, index): print(self.studentList[index]) def display(self, listInfo): print('\nDisplaying {}'.format(listInfo)) print("\nStudent ID# Student Name Age GPA") print("=============================================================") for person in self.studentList: print("{} {}".format(person.id, person.name), self.spaces(person.name), "{} {}".format(person.age, person.gpa)) def swap(self, x, y): """swap the person objects in the studentList at index x and y""" temp = self.studentList[x] self.studentList[x] = self.studentList[y] self.studentList[y] = temp def gpaSort(self): """sort the students list in descending order of GPA""" """Bubble sort""" maxgpa = list(self.studentList) for gpa1 in range(len(maxgpa)): for gpa2 in range(len(maxgpa)-1): if maxgpa[gpa2][0] < maxgpa[gpa2 + 1][0]: maxgpa[gpa2], maxgpa[gpa2 + 1] = maxgpa[gpa2 + 1], maxgpa[gpa2] return maxgpa def ageSort(self): """sort the students list in ascending order of age""" """selection sort""" minage = list(self.studentList) for age1 in range(len(minage)): for age2 in range(age1 + 1, len(minage)): if minage[age1][2] > minage[age2][2]: minage[age1], minage[age2] = minage[age2], minage[age1] return minage def idSort(self): """sort the student list in descending order of id numbers""" """Insertion sort""" maxid = list(self.studentList) for idindex in range(1, len(maxid)): while(idindex > 0): if maxid[idindex][3] < maxid[idindex - 1][3]: break maxid[idindex], maxid[idindex -1 ] = maxid[idindex - 1], maxid[idindex] idindex -= 1 return maxid def search(self, studentID): """search for a student in the student list with the passed idNumber return the index of the student if found, return -1 if not found""" pass ############################################################################################ def main(): studentArray = List() studentArray.display("UNSORTED LIST OF STUDENTS") input("\nPRESS ENTER TO SORT BY GPA") studentArray.gpaSort() studentArray.display("STUDENTS SORTED IN DESCENDING ORDER BY GPA") input("\nPRESS ENTER TO SORT BY AGE") studentArray.ageSort() studentArray.display("STUDENTS SORTED IN ASCENDING ORDER BY AGE") input("\nPRESS ENTER TO SORT BY ID#") studentArray.idSort() studentArray.display("STUDENTS SORTED IN DESCENDING ORDER BY ID#") input("PRESS ENTER TO CONTINUE") if hasattr(studentArray, "search"): try: idNumber = int(input("\n\nEnter the ID number of a student to search for: ")) location = studentArray.search(idNumber) if location == -1: print("Student Not Found") else: studentArray.displayStudent(location) except ValueError: print("Run it again and type an integer value") input("\n\nPRESS ENTER TO QUIT") main()
def gpaSort(self): """sort the students list in descending order of GPA""" """Bubble sort""" maxgpa = list(self.studentList) for gpa1 in range(len(maxgpa)): for gpa2 in range(len(maxgpa)-1): if maxgpa[gpa2].gpa < maxgpa[gpa2 + 1].gpa: maxgpa[gpa2], maxgpa[gpa2 + 1] = maxgpa[gpa2 + 1], maxgpa[gpa2] return maxgpa def ageSort(self): """sort the students list in ascending order of age""" """selection sort""" minage = list(self.studentList) for age1 in range(len(minage)): for age2 in range(age1 + 1, len(minage)): if minage[age1].age > minage[age2].age: minage[age1], minage[age2] = minage[age2], minage[age1] return minage def idSort(self): """sort the student list in descending order of id numbers""" """Insertion sort""" maxid = list(self.studentList) for idindex in range(1, len(maxid)): while(idindex > 0): if maxid[idindex].id < maxid[idindex - 1].id: break maxid[idindex], maxid[idindex -1 ] = maxid[idindex - 1], maxid[idindex] idindex -= 1 return maxid =========================== The issue is in above 3 functions.. When you want to compare the gpa, then you need to say: "maxgpa[gpa2].gpa" not "maxgpa[gpa2][0]", Because there is no index 0, in person object.. Rather person object has attributes such as id, gpa, name etc.. maxgpa is a list of persons.. So when you say maxgpa[gpa2] it means, you got a person object.. On this you say .gpa, which means you are accessing the gpa attribute of person and comparing that. Please upvote if it helps. Thanks!
I'm trying to sort a list of students from a text file in python(3.7) with three separate sorting functions (Bubble, selection, insert) I'm not sure to why as its not working I'm going to...
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PYTHON. Continues off another code(other code is below). I don't understand this. Someone please help! Comment the lines please so I can understand. There are short and med files lengths for each the list of names/ids and then search id file. These are the input files: https://codeshare.io/aVQd46 https://codeshare.io/5M3XnR https://codeshare.io/2W684E https://codeshare.io/5RJwZ4 LinkedList ADT to store student records(code is below). Using LinkedList ADT instead of the Python List. You will need to use the Student ADT(code is below) Imports the Student class...
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