the main part of tokenize

tokens = []
    for t in line.split():
        if t != ' ':
            #print(t)
            #print(tokens)
            if t in all_brackets:
                #print("holla " +t)
                tokens.append(t)
                #print(tokens)

            if coerce_to_number(t) !=None:
                tokens.append(coerce_to_number(t))
                # print(brackets[('(',')')])
            if coerce_to_number(t) ==None and t not in all_brackets:
                raise ValueError("invalid token " + t)
    return tokens