def repr_single_for_md(s):
    r"""
    Args:
        s (str):

    Returns:
        str: str_repr

    CommandLine:
        python -m ibeis.templates.generate_notebook --exec-repr_single_for_md --show

    Example:
        >>> # DISABLE_DOCTEST
        >>> from ibeis.templates.generate_notebook import *  # NOQA
        >>> s = '#HTML(\'<iframe src="%s" width=700 height=350></iframe>\' % pdf_fpath)'
        >>> result = repr_single_for_md(s)
        >>> print(result)
    """
    import utool as ut
    if True:
        str_repr = ut.reprfunc(s)
        import re
        if str_repr.startswith('\''):
            dq = (ut.DOUBLE_QUOTE)
            sq = (ut.SINGLE_QUOTE)
            bs = (ut.BACKSLASH)
            dq_, sq_, bs_ = list(map(re.escape, [dq, sq, bs]))
            no_bs = ut.negative_lookbehind(bs_)
            #no_sq = ut.negative_lookbehind(sq)
            #no_dq = ut.negative_lookbehind(dq)

            #inside = str_repr[1:-1]
            #inside = re.sub(no_bs + dq, bs + dq, inside)
            #inside = re.sub(no_bs + bs + sq, r"\\'", r"'", inside)
            #str_repr = '"' + inside + '"'
            #inside = re.sub(r'"', r'\\"', inside)
            #inside = re.sub(ut.negative_lookbehind(r"'") + r"\\'", r"'", inside)

            inside = str_repr[1:-1]
            # Escape double quotes
            inside = re.sub(no_bs + r'"', r'\\"', inside)
            # Unescape single quotes
            inside = re.sub(no_bs + bs_ + r"'", r"'", inside)
            # Append external double quotes
            str_repr = '"' + inside + '"'
        return str_repr
    else:
        return '"' + ut.reprfunc('\'' + s)[2:]
r"""
    Args:
        s (str):

    Returns:
        str: str_repr

    CommandLine:
        python -m ibeis.templates.generate_notebook --exec-repr_single_for_md --show

    Example:
        >>> # DISABLE_DOCTEST
        >>> from ibeis.templates.generate_notebook import *  # NOQA
        >>> s = '#HTML(\'<iframe src="%s" width=700 height=350></iframe>\' % pdf_fpath)'
        >>> result = repr_single_for_md(s)
        >>> print(result)