input: Write a python function to parse the username and domain from an email address using a class with methods.
  assert EmailParser("john@example.com").parse_username() == "john"
  assert EmailParser("john@example.com").parse_domain() == "example.com"
  assert EmailParser("alice@domain.org").parse_username() == "alice"
  assert EmailParser("alice@domain.org").parse_domain() == "domain.org"
  assert EmailParser("bob@website.net").parse_username() == "bob"
  assert EmailParser("bob@website.net").parse_domain() == "website.net"
output: class EmailParser:
      def __init__(self, email):
          self.email = email
  
      def parse_username(self):
          return self.email.split('@')[0]
  
      def parse_domain(self):
          return self.email.split('@')[1]