class Person:
  def __init__(self, name, age):
    self.name = name
    self.__age = age

  def get_age(self):
    return self.__age

  def set_age(self, age):
    if age > 0:
      self.__age = age
    else:
      print("Age must be positive")

p1 = Person("Tobias", 25)
print(p1.get_age())

p1.set_age(26)
print(p1.get_age())

class Student:
  def __init__(self, name):
    self.name = name
    self.__grade = 0

  def set_grade(self, grade):
    if 0 <= grade <= 100:
      self.__grade = grade
    else:
      print("Grade must be between 0 and 100")

  def get_grade(self):
    return self.__grade

  def get_status(self):
    if self.__grade >= 60:
      return "Passed"
    else:
      return "Failed"

student = Student("Emil")
student.set_grade(85)
print(student.get_grade())
print(student.get_status())

class Calculator:
  def __init__(self):
    self.result = 0

  def __validate(self, num):
    if not isinstance(num, (int, float)):
      return False
    return True

  def add(self, num):
    if self.__validate(num):
      self.result += num
    else:
      print("Invalid number")

calc = Calculator()
calc.add(10)
calc.add(5)
print(calc.result)
# calc.__validate(5) # This would cause an error7

import json

x = {
  "name": "John",
  "age": 30,
  "married": True,
  "divorced": False,
  "children": ("Ann","Billy"),
  "pets": None,
  "cars": [
    {"model": "BMW 230", "mpg": 27.5},
    {"model": "Ford Edge", "mpg": 24.1}
  ]
}

print(json.dumps(x))

import re

txt = "The rain in Spain"
x = re.search("\s", txt)

print("The first white-space character is located in position:", x.start()) 

class MyClass:
  x = 5

print(MyClass)