<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Python Opcodes</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="PartOpcodesOverview.html" title="Part II. Opcodes Overview" /> <link rel="prev" href="lua.html" title="Lua Opcodes" /> <link rel="next" href="PythonOpcodesSyntax.html" title="Orchestra Syntax" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Python Opcodes</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="lua.html">Prev</a> </td> <th width="60%" align="center">Part II. Opcodes Overview</th> <td width="20%" align="right"> <a accesskey="n" href="PythonOpcodesSyntax.html">Next</a></td> </tr> </table> <hr /> </div> <div class="chapter"> <div class="titlepage"> <div> <div> <h2 class="title"><a id="py"></a>Python Opcodes</h2> </div> </div> </div> <div class="section"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="PythonOpcodes"></a>Introduction</h2> </div> </div> </div> <p>Using the Python opcode family, you can interact with a Python interpreter embedded in Csound in five ways:</p> <div class="orderedlist"> <ol class="orderedlist" type="1"> <li class="listitem">Initialize the Python interpreter (the <a class="link" href="pyinit.html" title="pyinit Opcodes"><em class="citetitle">pyinit</em></a> opcodes),</li> <li class="listitem">Run a statement (the <a class="link" href="pyrun.html" title="pyrun Opcodes"><em class="citetitle">pyrun</em></a> opcodes),</li> <li class="listitem">Execute a script (the <a class="link" href="pyexec.html" title="pyexec Opcodes"><em class="citetitle">pyexec</em></a> opcodes),</li> <li class="listitem">Invoke a callable and pass arguments (the <a class="link" href="pycall.html" title="pycall Opcodes"><em class="citetitle">pycall</em></a> opcodes),</li> <li class="listitem">Evaluate an expression (the <a class="link" href="pyeval.html" title="pyeval Opcodes"><em class="citetitle">pyeval</em></a> opcodes), or</li> <li class="listitem">Change the value of a Python object, possibly creating a new Python object (the <a class="link" href="pyassign.html" title="pyassign Opcodes"><em class="citetitle">pyassign</em></a> opcodes);</li> </ol> </div> <p>and you can do any of these things:</p> <div class="orderedlist"> <ol class="orderedlist" type="1"> <li class="listitem">At i-time or at k-time,</li> <li class="listitem">In the global Python namespace, or in a namespace specific to an individual instance of a Csound instrument (local or "l" context),</li> <li class="listitem">And can you can retrieve from 0 to 8 return values from callables that accept N parameters.</li> </ol> </div> <p>...this means that there are many Python-related opcodes. But all of these opcodes share the same <span class="emphasis"><em>py</em></span> prefix, and have a regular naming scheme:</p> <pre class="programlisting"> "py" + [optional context prefix] + [action name] + [optional x-time suffix]</pre> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="lua.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="PartOpcodesOverview.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="PythonOpcodesSyntax.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top"> Lua Opcodes </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Orchestra Syntax</td> </tr> </table> </div> </body> </html>