if self.current_char == '+': self.advance() return Token(PLUS, '+')

def get_next_token(self): while self.current_char is not None:

def advance(self): self.pos += 1 if self.pos > len(self.text) - 1: self.current_char = None else: self.current_char = self.text[self.pos]

Hope this helps!

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

# Lexer class class Lexer: def __init__(self, text): self.text = text self.pos = 0 self.current_char = self.text[self.pos]

self.error()