Python AFTL Interpreter

alphabet = '@.<>()^+-*/,"[]~'
loops = 10
codeinp = ""
code = []
stack = []

codeinp = input()

for character in codeinp:
    if character in alphabet:
        code.append(character)
    else:
        print(character)

i = 0

while i < len(code):
    if code[i] == "@":
        code.pop(i)
        i = 0
    elif code[i] == ".":
        code.pop(i)
        for character in code:
            if len(character) == 1:
                print(character,end="")
            else:
                print("[")
        i = len(code)
    elif code[i] == "<":
        code.pop(i)
        code.pop(i-1)
        i -= 1
    elif code[i] == ">":
        code.pop(i)
        code.pop(i)
    elif code[i] == "(":
        code.pop(i)
        stack.append(ord(code.pop(i-1)))
        i -= 1
    elif code[i] == ")":
        code.pop(i)
        stack.append(ord(code.pop(i)))
    elif code[i] == "^":
        code.pop(i)
        code.insert(i,chr(int(stack.pop())))
        i += 1
    elif code[i] == "+":
        code.pop(i)
        stack.append(stack.pop() + stack.pop())
    elif code[i] == "-":
        code.pop(i)
        stack.append(stack.pop() - stack.pop())
    elif code[i] == "*":
        code.pop(i)
        stack.append(stack.pop() * stack.pop())
    elif code[i] == "/":
        code.pop(i)
        stack.append(stack.pop() / stack.pop())
    elif code[i] == ",":
        code.pop(i)
        stack.append(ord(input()[0]))
    elif code[i] == '"':
        code.pop(i)
        stack.append(stack[-1])
    elif code[i] == "[":
        code.pop(i)
        code.insert(i,str(loops))
        loops += 1
    elif code[i] == "]":
        code.pop(i)
        loops -= 1
        i = code.index(str(loops))
        code.pop(i)
    elif code[i] == "~":
        code.pop(i)
        i += 1
    else:
        i += 1