page.py 文件源码

def page(data, start=0, screen_lines=0, pager_cmd=None):
    """Display content in a pager, piping through a pager after a certain length.

    data can be a mime-bundle dict, supplying multiple representations,
    keyed by mime-type, or text.

    Pager is dispatched via the `show_in_pager` IPython hook.
    If no hook is registered, `pager_page` will be used.
    """
    # Some routines may auto-compute start offsets incorrectly and pass a
    # negative value.  Offset to 0 for robustness.
    start = max(0, start)

    # first, try the hook
    ip = get_ipython()
    if ip:
        try:
            ip.hooks.show_in_pager(data, start=start, screen_lines=screen_lines)
            return
        except TryNext:
            pass

    # fallback on default pager
    return pager_page(data, start, screen_lines, pager_cmd)