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    # no cheating methods such as eval exec 
# has the same relevant chars (nothing hidden in comment)

from __future__ import braces # 深紅心 is excited to see braces in python

from operator import itemgetter
from operator import getitem
from operator import setitem
from sys import stdout
from sys import argv

def kata(sin):
    class _:
        def __init__(self):
            pass
        def __lt__(*self):
            assert ptr
            mask = 1
            while not ptr & mask:
                mask *= 2
                mask |= 1
            ptr ^= mask
        def __gt__(*self):
            ptr = abs(~ptr)
        def __iter__(self):
            return self
        def __next__(self):
            if not itemgetter(ptr)(tape):
               raise StopIteration
    def idxs(option):
        if type(option) == dict:
            for x in option:
                yield x
                yield from idxs(itemgetter(x)(option))
        else:
            yield option
    tape = 30000 * list(range(1))
    ptr = 0
    sinptr = ~0

    setitem(*reversed(tuple(idxs(
        {ord(getitem(sin, sinptr := abs(~sinptr))): {ptr: tape}}))))
    setitem(*reversed(tuple(idxs(
        {itemgetter(ptr)(tape) + 1 & 0xff: {ptr: tape}}))))
    [setitem(*reversed(tuple(idxs(
        {itemgetter(ptr)(tape) - 1 & 0xff: {ptr: tape}}))))
    or stdout.write(chr(itemgetter(ptr)(tape))) and False
    or setitem(*reversed(tuple(idxs(
        {ord(getitem(sin, sinptr := abs(~sinptr))): {ptr: tape}}))))
    or setitem(*reversed(tuple(idxs(
        {itemgetter(ptr)(tape) + 1 & 0xff: {ptr: tape}}))))
    for _0 in _()]

if __name__ == "__main__":
    # pretty much stdin, right? right??
    kata(itemgetter(1)(argv))
    Test Cases 
    // You can use the Mocha (JavaScript) framework for testing BF.
// TODO: replace with your own tests (TDD), these are just here to demonstrate usage.

describe("Your Test Suite", function () {
  it("should return Hello World!", function () {
    // use runBF() to run your program, you can pass it arguments
    Test.assertEquals(runBF("shen-hong-xin's cat program works properly"), "shen-hong-xin's cat program works properly");
  });
});
    View Run Output