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/usr/share/sphinx/texinputs/python.ist is in sphinx-common 1.3.6-2ubuntu1.

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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}"