Practice With Classes

class Student:
    name = 0
    age = 0
    role_number = 0
    math_marks = 0
    english_marks = 0
    science_marks = 0

    def __init__(self):
        pass

    def user_input(self):
        self.name = (raw_input("Enter your name over here: "))
        self.age = input("Enter your age over here: ")
        self.role_number = input("Enter your role number over here: ")
        self.math_marks = input("Enter your math marks out of 100 over here: ")
        while self.math_marks > 100:
            print("Enter a valid number for you math marks.")
            self.math_marks = input("Enter your math marks out of 100 over here: ")
        self.english_marks = input("Enter your english marks out of 100 over here: ")
        while self.english_marks > 100:
            print("Enter a valid number for your english marks.")
            self.english_marks = input("Enter your english marks out of 100 over here: ")
        self.science_marks = input("Enter your science marks out of 100 over here: ")
        while self.science_marks > 100:
            print("Enter a valid number for your science.")
            self.science_marks = input("Enter your science marks out of 100 over here: ")

    def output(self):
        print(self.name)
        print(self.age)
        print(self.role_number)
        if self.math_marks >= 90:
            print(str(self.math_marks) + "% " + "A")
        if 89 >= self.math_marks >= 80:
            print(str(self.math_marks) + "% " + "B")
        if 79 >= self.math_marks >= 70:
            print(str(self.math_marks) + "% " + "C")
        if 69 >= self.math_marks >= 60:
            print(str(self.math_marks) + "% " + "D")
        if 59 >= self.math_marks >= 0:
            print(str(self.math_marks) + "% " + "F")
        if self.english_marks >= 90:
            print(str(self.english_marks) + "% " + "A")
        if 89 >= self.english_marks >= 80:
            print(str(self.english_marks) + "% " + "B")
        if 79 >= self.english_marks >= 70:
            print(str(self.english_marks) + "% " + "C")
        if 69 >= self.english_marks >= 60:
            print(str(self.english_marks) + "% " + "D")
        if 59 >= self.english_marks >= 0:
            print(str(self.english_marks) + "% " + "F")
        if self.science_marks >= 90:
            print(str(self.science_marks) + "% " + "A")
        if 89 >= self.science_marks >= 80:
            print(str(self.science_marks) + "% " + "B")
        if 79 >= self.science_marks >= 70:
            print(str(self.science_marks) + "% " + "C")
        if 69 >= self.science_marks >= 60:
            print(str(self.science_marks) + "% " + "D")
        if 59 >= self.science_marks >= 0:
            print(str(self.science_marks) + "% " + "F")


Student_Info = Student()
Student_Info.user_input()
Student_Info.output()