# Example usage lexer = Lexer('2 + 3') token = lexer.get_next_token()

def integer(self): result = '' while self.current_char is not None and self.current_char.isdigit(): result += self.current_char self.advance() return int(result)

def __repr__(self): return f'Token({self.type}, {self.value})'

self.error()

Here is sample code for lexical analyzer