def summarize_attr(key, value, col_width=None):
    """Summary for __repr__ - use ``X.attrs[key]`` for full value."""
    # Indent key and add ':', then right-pad if col_width is not None
    k_str = f"    {key}:"
    if col_width is not None:
        k_str = pretty_print(k_str, col_width)
    # Replace tabs and newlines, so we print on one line in known width
    v_str = str(value).replace("\t", "\\t").replace("\n", "\\n")
    # Finally, truncate to the desired display width
    return maybe_truncate(f"{k_str} {v_str}", OPTIONS["display_width"])
Summary for __repr__ - use ``X.attrs[key]`` for full value.
xarray/core/formatting.py