Using Python language- how that gives the output "congraadulations" to every student with a higher average than the class average

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Python2.7

- Students must be displayed on the monitor, sorted by their average. The name and average of each student should appear- use the bubble sort function

- They must display the name of the student (and respective average) of the student with the best average on the monitor.

- They must display the name of the student (and respective average) of the student with the lowest average on the monitor.

What I have tried:

num_students = eval(input("How many students are in the class? "))
num_grades = eval(input("How many subjects do the students have? "))
name = []
name = [0]*num_students
grade = []
grade = [0]*num_grades
name_subjects = []
subjects = [0]*num_subjects

for i in range (num_students):
nome[i] = input("Name of the student: ")
for j in range (num_grades):
nota[j] = input("Grade of the student: ")

print ("The class average is", average)


if grade[j] > average:
print("Congradulations!", name[i])