ref: 7c1e0be91969ab0d8fca4bd1fd52de32f4a9a0c5
dir: /sys/src/cmd/python/Doc/texinputs/python.ist/
line_max 100 headings_flag 1 heading_prefix " \\bigletter " preamble "\\begin{theindex} \\def\\bigletter#1{{\\Large\\sffamily#1}\\nopagebreak\\vspace{1mm}} " symhead_positive "{Symbols}" numhead_positive "{Numbers}"