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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def gpg_decrypt(cfg, gpg_config=None):
 """Decrypt GPG objects in configuration. Args: cfg (dict):
 configuration dictionary gpg_config (dict):
 gpg configuration dict of arguments for gpg including: homedir, binary, and keyring (require all if any) example: gpg_config = {'homedir': '~/.gnupg/', 'binary': 'gpg', 'keyring': 'pubring.kbx'} Returns: dict: decrypted configuration dictionary The aim is to find in the dictionary items which have been encrypted with gpg, then decrypt them if possible. We will either detect the encryption based on the PGP block text or a user can create a key "_gpg" in which to store the data. Either case will work. In the case of the "_gpg" key all data at this level will be replaced with the decrypted contents. For example: will transform to: {'component': {'key': 'decrypted value'}} However: will transform to: {'component': {'key': 'decrypted value'}} """

    def decrypt(obj):
        """Decrypt the object.

        It is an inner function because we must first verify that gpg
        is ready. If we did them in the same function we would end up
        calling the gpg checks several times, potentially, since we are
        calling this recursively.
        """
        if isinstance(obj, list):
            res_v = []
            for item in obj:
                res_v.append(decrypt(item))
            return res_v
        elif isinstance(obj, dict):
            if '_gpg' in obj:
                try:
                    decrypted = gpg.decrypt(obj['_gpg'])
                    if decrypted.ok:
                        obj = n(decrypted.data.decode('utf-8').encode())
                    else:
                        log.error("gpg error unpacking secrets %s", decrypted.stderr)
                except Exception as err:
                    log.error("error unpacking secrets %s", err)
            else:
                for k, v in obj.items():
                    obj[k] = decrypt(v)
        else:
            try:
                if 'BEGIN PGP' in obj:
                    try:
                        decrypted = gpg.decrypt(obj)
                        if decrypted.ok:
                            obj = n(decrypted.data.decode('utf-8').encode())
                        else:
                            log.error("gpg error unpacking secrets %s", decrypted.stderr)
                    except Exception as err:
                        log.error("error unpacking secrets %s", err)
            except TypeError:
                log.debug('Pass on decryption. Only decrypt strings')
        return obj

    if GPG_IMPORTED:
        if not gpg_config:
            gpg_config = {}
            defaults = {'homedir': '~/.gnupg/'}
            env_fields = {'homedir': 'FIGGYPY_GPG_HOMEDIR',
                          'binary': 'FIGGYPY_GPG_BINARY',
                          'keyring': 'FIGGYPY_GPG_KEYRING'}
            for k, v in env_fields.items():
                gpg_config[k] = env_or_default(v, defaults[k] if k in defaults else None)
        try:
            gpg = gnupg.GPG(**gpg_config)
        except (OSError, RuntimeError):
            log.exception('Failed to configure gpg. Will be unable to decrypt secrets.')
        return decrypt(cfg)
    return cfg