Python 3.5 Need the following code changed so that it is just one function, and

Question

Python 3.5

Need the following code changed so that it is just one function, and not a class with sub-functions.

The function should be read_classlist()

It reads the classlist from file, and prints a list like in printData(self) and displayRecords(students)

The menu function can be ignored completely.

class Student:
"""
Class definition
"""
def __init__(self, name="", id="", mail=""):
"""
Constructor
"""
self.name = name;
self.id = id;
self.mail = mail;
self.marks = [];
  
def printData(self):
"""
Class method that prints Student data
"""
print(" " + self.id + ": " + self.name + ", " + self.mail + ", marks: ", end="");
print(self.marks);
  
  
def display_menu():
"""
Function that displays menu
"""
# Printing menu
print(" 1 - Read Class List 2 - List Students 3 - Exit ");
  
# Accepting user choice
sel = int(input(" Your selection: "));
  
# Return user selected value
return sel;
  
def read_classlist():
"""
Function that reads file and generates a list of student objects
"""
# Reading file name
fileName = input(" Enter file name: ");
  
# List to hold student objects
students = [];
  
try:
# Opening file in read mode
fp = open(fileName, "r");
  
# Reading line by line
for line in fp:
# Stripping white space
line = line.strip();
  
# Splitting data on comma
data = line.split(",");
  
# Constructing student object
obj = Student(data[0], data[1], data[2]);
  
# Storing object into list
students.append(obj);
  
# Closing file
fp.close();
  
print(" File has been successfully read... ");
  
except IOError:
# Handling exceptions
print(" File Doesn't Exist... ");
  
finally:
# Return list of students
return students;
  
def displayRecords(students):
"""
Function that displays Student data
"""
# If there are no students
if len(students) == 0:
print(" There are no students to display... ");
else:
# Iterating over student objects
for stu in students:
# Printing student data
stu.printData();
  
def main():
"""
Main function
"""
# Empty list
students = [];
  
# Iterate till user wants to quit
while(True):
  
# Reading selection by displaying menu
sel = display_menu();
  
# Reading data
if sel == 1:
students = read_classlist();
  
# Displaying
elif sel == 2:
displayRecords(students);
  
# Exit
else:
return;
  
# Calling main function
main();

Explanation / Answer

class Student:
def __init__(self,name = "",id = "",email=""):
self.id = id;
self.name = name;
self.email =email;
  
def read_classlist():
#fileName = input(" Enter file name: ");
students = [];
#inputfile = .join(fileName);
try:
fp = open("E:/Chegg/studentdata.txt", "r");
for line in fp:
line = line.strip();
data = line.split(",");
obj = Student(data[0], data[1], data[2]);
students.append(obj);
  
if len(students) == 0:
print(" There are no students to display... ");
else:
for stu in students:
print(" " + stu.id + ": " + stu.name + ", " + stu.email);
  
fp.close();
print(" File has been successfully read... ");
  
except IOError:
print(" File Doesn't Exist... ");
  

def main():
## s = Student();
## s.__init__("xyz",1,"abcmail.com");
read_classlist();

main();

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