Parse arguments

parse.py

a='base(octopi,a(b,c(a2)),mm)'

def parse(a):
    stack=[]
    token = ""
    
    for char in a:
        if char == "(":
            stack.append(token)
            if token != "":
                print("start_" + token)
            token = ""
        elif char == ")":
            parrent = stack.pop()
            if token != "":
                print("start_" + token)
                print("end_" + token)
                token = ""
            if parrent != "":
                print("end_" + parrent)
        elif char == ",":
            if token != "":
                print("start_" + token)
                print("end_" + token)
                token = ""
        else:
            token += char

    if token != "":
        print("start_" + token)
        print("end_" + token)
    if len(stack) > 0:
        raise Exception(str(stack))
    return
            
parse(a)