passing variables into another class python

I am very new to python and am currently taking a class in it at my university. I am stuck on a program that my professor wants us to write. I think that I have most of what he wants working except for correctly passing the variables to the method getClass in the class Traffic. Here is the given assignment:

Step 4:

Steps:

• Modify the class called Traffic that will have four private attributes: throughput, delay, jitter, loss.
• Modify the method called getClass within the Traffic class, that will classify traffic as below:
  • Best effort: throughput < 5, delay between 8 and 10
    or
    Throughput between 5 and 10, delay > 8
  • Controlled load: throughput between 5 and 10 , delay <= 8
    or
    Throughput >=10, delay >= 5
  • Guaranteed: throughput >=10, delay < 5

Write a program called testTrafficClass to test the traffic class. The program will have a main() function that will initialize the four attributes of class Traffic, and print the traffic class. It will then prompt the user to change the attributes, and will print traffic class based on the new values.

Here is the code I have so far:

def Main():
    def __init__(self, throughput = 0, delay = 0, jitter = 0, loss = 0):
        self.__throughput = throughput
        self.__delay = delay
        self.__jitter = jitter
        self.__loss = loss

    throughput = eval(input("Enter Throughput: "))
    delay = eval(input("Enter Delay: "))
    jitter = eval(input("Enter Jitter: "))
    loss = eval(input("Enter Loss: "))

    Traffic.getClass(self, throughput, delay)

class Traffic:
        def getClass(self, throughput, delay):
            if (throughput<5) and (delay <= 10) and (8<=delay):
                print("Best Effort")
            if (5<=throughput) and (throughput<=10) and (delay>8):
                print ("Best Effort")
            if (5<=throughput) and (throughput<=10) and (delay<=8):
                print ("Controlled load")
            if (throughput >=10) and (delay >=5):
                print ("Controlled load")
            if (throughput >=10) and (delay <5):
                print ("Guaranteed")

Main()

I'm sure this isn't the best or most elegant code there is since I am very new to Python. If someone could get me on the right track that would be great. I keep getting errors when I run it.