Fuckhard interpreter (Brainfuck derivative)

fh.py

code = input("program: ")
data = [0]

ip = 0
dp = 0

input_buffer = ""

def error(msg):
    raise Exception(msg)

while True:
    if ip < 0 or ip >= len(code):
        break
    op = code[ip]
    #print(op)
    match op:
        case '+':
            data[dp] = 1
            ip += 1
        case '>':
            dp += 1
            if dp >= len(data):
                data.append(0)
            ip += 1
        case '<':
            dp = 0
            ip += 1
        case '(':
            if data[dp] == 0:
                ip += 1
                continue
            depth = 1
            while depth > 0:
                ip += 1
                if ip >= len(code):
                    # exited program, halt
                    break
                if code[ip] == '(':
                    depth += 1
                elif code[ip] == ')':
                    depth -= 1
        case ']':
            if data[dp] == 0:
                ip += 1
                continue
            depth = 1
            while depth > 0:
                ip -= 1
                if ip < 0:
                    # exited program, halt
                    break
                if code[ip] == ']':
                    depth += 1
                elif code[ip] == '[':
                    depth -= 1
        case ',':
            while not input_buffer:
                input_buffer = input('> ')
            c = input_buffer[0]
            input_buffer = input_buffer[1:]
            match c:
                case '1':
                    data[dp] = 1
                case '0':
                    pass
                case _:
                    error("not a bit: "+c)
            ip += 1
        case '.':
            print(data[dp])
            ip += 1
        case _:
            ip += 1