[Python] implementation in python of nested Loops in brainfuck? [closed]

I'm writing a brainfuck interpreter, and the loops don't work, I don't know why. it's probably some dumb mistake.

case "[":
t("enter a loop")
depth = 1
index = 0
if tape[pointer] == 0:
t("skip a loop")
#skip to the matching ]
while depth != 0:
t(f"depth: {depth}")
index += 1
if code[i + index] == "]":
depth -= 1
elif code[i + index] == "[":
depth += 1
else:
t("loop is verified")
code_snippet = ""
while depth != 0:
t(f"depth: {depth}")
index += 1
if code[i + index] == "]":
depth -= 1
elif code[i + index] == "[":
depth += 1

if depth != 0:
t("found end")
code_snippet = code_snippet + code[i + index]
interpret(code_snippet)


this is what I tried; the loops don't work. t() is just a debug function and interpret() is recursively interpreting brainfuck code, I've verified that the interpreter works.

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