tokens.py

from typing import Optional

TT_NUMBER = "TT_NUMBER"
TT_PLUS = "TT_PLUS"
TT_MINUS = "TT_MINUS"
TT_MULTIPLY = "TT_MULTIPLY"
TT_DIVIDE = "TT_DIVIDE"
TT_MODULO = "TT_MODULO"
TT_LPAREN = "TT_LPAREN"
TT_RPAREN = "TT_RPAREN"

def operator_to_character(token_type: str) -> str:
    if token_type == TT_PLUS:
        return "+"
    elif token_type == TT_MINUS:
        return "-"

    elif token_type == TT_MULTIPLY:
        return "*"
    elif token_type == TT_DIVIDE:
        return "/"
    elif token_type == TT_MODULO:
        return "%"
    elif token_type == TT_LPAREN:
        return "("
    elif token_type == TT_RPAREN:
        return ")"

class Token:
    def __init__(self,type:str,value:Optional[float]=None):
        self.type = type
        self.value = value

    def __repr__(self) -> str:
        token_repr = self.type.replace("TT_","")
        if self.value is not None:
            token_repr += ":" + str(self.value)
        return token_repr