def download_file(url, dest=None, chunk_size=1024, replace="ask",
                  label="Downloading {dest_basename} ({size:.2f}MB)",
                  expected_extension=None):
    """Download a file from a given URL and display progress.

    :param dest: If the destination exists and is a directory, the filename
        will be guessed from the Content-Disposition header. If the destination
        is an existing file, the user will either be prompted to overwrite, or
        the file will be replaced (depending on the value of **replace**). If
        the destination does not exist, it will be used as the filename.
    :param int chunk_size: bytes read in at a time.
    :param replace: If `False`, an existing destination file will not be
        overwritten.
    :param label: a string which is formatted and displayed as the progress bar
        label. Variables provided include *dest_basename*, *dest*, and *size*.
    :param expected_extension: if set, the filename will be sanitized to ensure
        it has the given extension. The extension should not start with a dot
        (`.`).
    """
    dest = Path(dest or url.split("/")[-1])
    response = get(url, stream=True)
    if (dest.exists()
            and dest.is_dir()
            and "Content-Disposition" in response.headers):
        content_disposition = rfc6266.parse_requests_response(response)
        if expected_extension is not None:
            filename = content_disposition.filename_sanitized(
                expected_extension)
        filename = secure_filename(filename)
        dest = dest / filename
    if dest.exists() and not dest.is_dir():
        if (replace is False
                or replace == "ask"
                and not click.confirm("Replace {}?".format(dest))):
            return str(dest)
    size = int(response.headers.get("content-length", 0))
    label = label.format(dest=dest, dest_basename=dest.name,
                         size=size/1024.0/1024)
    with click.open_file(str(dest), "wb") as f:
        content_iter = response.iter_content(chunk_size=chunk_size)
        with click.progressbar(content_iter, length=size/1024,
                               label=label) as bar:
            for chunk in bar:
                if chunk:
                    f.write(chunk)
                    f.flush()
    return str(dest)
def theme_generic_recurse(data):
            col.label(data.rna_type.name)
            row = col.row()
            subsplit = row.split(percentage=0.95)

            padding1 = subsplit.split(percentage=0.15)
            padding1.column()

            subsplit = row.split(percentage=0.85)

            padding2 = subsplit.split(percentage=0.15)
            padding2.column()

            colsub_pair = padding1.column(), padding2.column()

            props_type = {}

            for i, prop in enumerate(data.rna_type.properties):
                if prop.identifier == "rna_type":
                    continue

                props_type.setdefault((prop.type, prop.subtype), []).append(prop)

            th_delimiters = USERPREF_PT_theme.ui_delimiters.get(theme_area)
            for props_type, props_ls in sorted(props_type.items()):
                if props_type[0] == 'POINTER':
                    for i, prop in enumerate(props_ls):
                        theme_generic_recurse(getattr(data, prop.identifier))
                else:
                    if th_delimiters is None:
                        # simple, no delimiters
                        for i, prop in enumerate(props_ls):
                            colsub_pair[i % 2].row().prop(data, prop.identifier)
                    else:
                        # add hard coded delimiters
                        i = 0
                        for prop in props_ls:
                            colsub = colsub_pair[i]
                            colsub.row().prop(data, prop.identifier)
                            i = (i + 1) % 2
                            if prop.identifier in th_delimiters:
                                if i:
                                    colsub = colsub_pair[1]
                                    colsub.row().label("")
                                colsub_pair[0].row().label("")
                                colsub_pair[1].row().label("")
                                i = 0