initial import

+\ProvidesPackage{pytex}
+
+\RequirePackage{pgfopts}
+\RequirePackage{sverb}
+\RequirePackage{fancyvrb}
+
+\makeatletter
+
+%%
+%%
+
+\edef\py@port{12345}
+\edef\py@base{\jobname.pytmp}
+
+\pgfkeys{
+  /pytex/.cd,
+  base/.store in=\py@base,
+  port/.store in=\py@port,
+}
+
+\ProcessPgfOptions{/pytex}
+
+\immediate\write18{pytex -b {\py@base} --listen {\py@port} {\jobname}}
+\AtEndDocument{\immediate\write18{pytex -b {\py@base} --quit {\py@port}}}
+
+\IfFileExists{\py@base/\jobname}
+  {\global\edef\py@base{\py@base/}}
+  {\global\edef\py@base{\py@base.}}
+
+%%
+%%
+
+\newcounter{py@count}
+\newwrite\py@file
+\newwrite\py@jobs
+
+\immediate\openout\py@jobs=\jobname.pytex
+
+\def\py@basename{\py@base\thepy@count}
+
+\def\py@next #1{%
+  \edef\py@last{\py@basename}%
+  \addtocounter{py@count}{1}%
+  \edef\py@basename{\py@base\thepy@count}%
+  \edef\py@src{\py@basename.py}%
+  \edef\py@@src{{\py@src}}%
+  \edef\py@out{{\py@basename.out}}%
+  \edef\py@tex{{\py@basename.tex}}%
+  \immediate\write\py@jobs{#1 \py@src}%
+}
+
+\def\py@open{\immediate\openout\py@file=\py@src}
+\def\py@write{\immediate\write\py@file}
+\def\py@close{\immediate\closeout\py@file}
+\def\py@compile #1{\immediate\write18{pytex -b {\py@base} --call {\py@port} #1 {\py@src}}}
+\def\py@input #1{\expandafter\expandafter\expandafter
+  \InputIfFileExists\csname py@#1\endcsname{}{}}
+
+\def\pyv #1{%
+  \py@next{eval}%
+  \py@open
+  \py@write{#1}%
+  \py@close
+  \py@compile{eval}%
+  \py@input{out}%
+}
+
+\def\pyx #1{%
+  \py@next{exec}%
+  \py@open
+  \py@write{#1}%
+  \py@close
+  \py@compile{exec}%
+  \py@input{out}%
+}
+
+\def\pyc #1{\leavevmode
+  \py@next{code}%
+  \py@open
+  \py@write{#1}%
+  \py@close
+  \pyx{pygmentize("\py@last.py", inline=True)}%
+}
+
+\def\pyd #1#2{%
+  \py@next{eval}%
+  \py@open
+  \py@write{#2}%
+  \py@close
+  \py@compile{eval}%
+  \pyx{makedef("#1", "\py@last")}%
+}
+
+\newenvironment{pyeval}{%
+  \py@next{eval}%
+  \expandafter\verbwrite\py@@src
+}{\endverbwrite
+  \py@compile{eval}%
+  \py@input{out}%
+}
+
+\newenvironment{pyexec}{%
+  \py@next{exec}%
+  \expandafter\verbwrite\py@@src
+}{\endverbwrite
+  \py@compile{exec}%
+  \py@input{out}%
+}
+
+\newenvironment{pycode}{%
+  \py@next{exec}%
+  \expandafter\verbwrite\py@@src
+}{\endverbwrite
+  \pyx{pygmentize("\py@last.py", inline=False)}
+}
+
+%%
+%%
+
+\makeatother
+
+\pyx{reset()}
\ No newline at end of file

+\documentclass{article}
+
+\usepackage{pytex}
+\parindent=0pt
+
+\begin{document}
+
+***\pyv{" ".join(s.capitalize() for s in "hello world!".split())}***
+
+*\pyx{x=40}**\pyv{x+2}***
+
+***\pyd{hello}{x+2}***\hello***
+
+\begin{pyexec}
+def fact (n) :
+    f = 1
+    for i in range(1, n+1) :
+        f *= i
+    return f
+\end{pyexec}
+
+\begin{pyeval}
+[fact(n) for n in range(10)
+ if n % 2 == 0]
+\end{pyeval}
+
+**********************
+
+Code ``\pyc{lambda x : x + 1}'' is inlined.
+
+Code block:
+%
+\begin{pycode}
+def fact (n) :
+    f = 1
+    for i in range(1, n+1) :
+        f *= i
+    return f
+\end{pycode}
+
+\IfFileExists{pytex.tmp}{found}{NO}.
+  
+\end{document}