input: Write a function to implement the given Python class with the specified attributes and functions. The class should have attributes name (string), age (integer), email address (string) and a function toString() that returns a formatted string of the attributes.
  assert Person("John Doe", 30, "john.doe@example.com").toString()=="Name: John Doe, Age: 30, Email: john.doe@example.com"
  assert Person("Jane Smith", 25, "jane.smith@example.com").toString()=="Name: Jane Smith, Age: 25, Email: jane.smith@example.com"
  assert Person("Alex Brown", 45, "alex.brown@example.com").toString()=="Name: Alex Brown, Age: 45, Email: alex.brown@example.com"
output: class Person:
      def __init__(self, name, age, email):
          self.name = name
          self.age = age
          self.email = email
      
      def toString(self):
          return f"Name: {self.name}, Age: {self.age}, Email: {self.email}"