def extract_bower_zipfile(self, zip_file, dest, expected_version=None):
        bower_json = None
        root = None
        deps_installed = []
        for info in zip_file.infolist():
            if PurePath(info.filename).name == "bower.json":
                with zip_file.open(info) as f:
                    bower_json = json.load(f)
                    root = str(PurePath(info.filename).parent)
                break
        version = bower_json["version"]
        if expected_version is not None:
            expected_version = Bower.clean_semver(expected_version)
            if not semver.match(version, expected_version):
                click.secho("error: versions do not match ({} =/= {})".format(
                    version, expected_version))
                raise InvalidPackageError
        if "dependencies" in bower_json:
            for package, version in bower_json["dependencies"].items():
                url = Bower.get_package_url(package)
                deps_installed.extend(self.get_bower_package(
                    url, dest=dest, version=version))
        ignore_patterns = [GitIgnorePattern(ig) for ig in bower_json["ignore"]]
        path_spec = PathSpec(ignore_patterns)
        namelist = [path for path in zip_file.namelist()
                    if PurePath(path).parts[0] == root]
        ignored = list(path_spec.match_files(namelist))
        for path in namelist:
            dest_path = PurePath(
                bower_json["name"],
                *PurePath(path).parts[1:])

            if path in ignored:
                continue

            for path in ignored:
                for parent in PurePath(path):
                    if parent in ignored:
                        continue

            if path.endswith("/"):
                if list(path_spec.match_files([str(dest_path)])):
                    ignored.append(PurePath(path))
                elif not (dest / dest_path).is_dir():
                    (dest / dest_path).mkdir(parents=True)
            else:
                target_path = dest / dest_path.parent / dest_path.name
                source = zip_file.open(path)
                target = target_path.open("wb")
                with source, target:
                    shutil.copyfileobj(source, target)
        deps_installed.append((bower_json["name"], bower_json["version"]))
        return deps_installed
def subset_examples(example_dict, indices_to_keep, create_new_dict=False):
    """Subsets examples in dictionary.

    :param example_dict: See doc for `write_example_file`.
    :param indices_to_keep: 1-D numpy array with indices of examples to keep.
    :param create_new_dict: Boolean flag.  If True, this method will create a
        new dictionary, leaving the input dictionary untouched.
    :return: example_dict: Same as input, but possibly with fewer examples.
    """

    error_checking.assert_is_integer_numpy_array(indices_to_keep)
    error_checking.assert_is_numpy_array(indices_to_keep, num_dimensions=1)
    error_checking.assert_is_boolean(create_new_dict)

    if not create_new_dict:
        for this_key in MAIN_KEYS:
            optional_key_missing = (
                this_key not in REQUIRED_MAIN_KEYS
                and this_key not in example_dict
            )

            if optional_key_missing:
                continue

            if this_key == TARGET_MATRIX_KEY:
                if this_key in example_dict:
                    example_dict[this_key] = (
                        example_dict[this_key][indices_to_keep, ...]
                    )
                else:
                    example_dict[TARGET_VALUES_KEY] = (
                        example_dict[TARGET_VALUES_KEY][indices_to_keep]
                    )

                continue

            if this_key == FULL_IDS_KEY:
                example_dict[this_key] = [
                    example_dict[this_key][k] for k in indices_to_keep
                ]
            else:
                example_dict[this_key] = example_dict[this_key][
                    indices_to_keep, ...]

        return example_dict

    new_example_dict = {}

    for this_key in METADATA_KEYS:
        sounding_key_missing = (
            this_key in [SOUNDING_FIELDS_KEY, SOUNDING_HEIGHTS_KEY]
            and this_key not in example_dict
        )

        if sounding_key_missing:
            continue

        if this_key == TARGET_NAMES_KEY:
            if this_key in example_dict:
                new_example_dict[this_key] = example_dict[this_key]
            else:
                new_example_dict[TARGET_NAME_KEY] = example_dict[
                    TARGET_NAME_KEY]

            continue

        new_example_dict[this_key] = example_dict[this_key]

    for this_key in MAIN_KEYS:
        optional_key_missing = (
            this_key not in REQUIRED_MAIN_KEYS
            and this_key not in example_dict
        )

        if optional_key_missing:
            continue

        if this_key == TARGET_MATRIX_KEY:
            if this_key in example_dict:
                new_example_dict[this_key] = (
                    example_dict[this_key][indices_to_keep, ...]
                )
            else:
                new_example_dict[TARGET_VALUES_KEY] = (
                    example_dict[TARGET_VALUES_KEY][indices_to_keep]
                )

            continue

        if this_key == FULL_IDS_KEY:
            new_example_dict[this_key] = [
                example_dict[this_key][k] for k in indices_to_keep
            ]
        else:
            new_example_dict[this_key] = example_dict[this_key][
                indices_to_keep, ...]

    return new_example_dict