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<!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="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>9. Full Grammar specification — Python 2.7.18 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/language_data.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.18 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="The Python Standard Library" href="../library/index.html" /> <link rel="prev" title="8. 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You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/reference/grammar.html"> Python documentation for the Python3 version packaged in this release</a>. </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="../library/index.html" title="The Python Standard Library" accesskey="N">next</a> |</li> <li class="right" > <a href="toplevel_components.html" title="8. Top-level components" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" accesskey="U">The Python Language Reference</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="full-grammar-specification"> <h1>9. Full Grammar specification<a class="headerlink" href="#full-grammar-specification" title="Permalink to this headline">ΒΆ</a></h1> <p>This is the full Python grammar, as it is read by the parser generator and used to parse Python source files:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Grammar for Python</span> <span class="c1"># Note: Changing the grammar specified in this file will most likely</span> <span class="c1"># require corresponding changes in the parser module</span> <span class="c1"># (../Modules/parsermodule.c). If you can't make the changes to</span> <span class="c1"># that module yourself, please co-ordinate the required changes</span> <span class="c1"># with someone who can; ask around on python-dev for help. Fred</span> <span class="c1"># Drake <fdrake@acm.org> will probably be listening there.</span> <span class="c1"># NOTE WELL: You should also follow all the steps listed in PEP 306,</span> <span class="c1"># "How to Change Python's Grammar"</span> <span class="c1"># Start symbols for the grammar:</span> <span class="c1"># single_input is a single interactive statement;</span> <span class="c1"># file_input is a module or sequence of commands read from an input file;</span> <span class="c1"># eval_input is the input for the eval() and input() functions.</span> <span class="c1"># NB: compound_stmt in single_input is followed by extra NEWLINE!</span> <span class="n">single_input</span><span class="p">:</span> <span class="n">NEWLINE</span> <span class="o">|</span> <span class="n">simple_stmt</span> <span class="o">|</span> <span class="n">compound_stmt</span> <span class="n">NEWLINE</span> <span class="n">file_input</span><span class="p">:</span> <span class="p">(</span><span class="n">NEWLINE</span> <span class="o">|</span> <span class="n">stmt</span><span class="p">)</span><span class="o">*</span> <span class="n">ENDMARKER</span> <span class="n">eval_input</span><span class="p">:</span> <span class="n">testlist</span> <span class="n">NEWLINE</span><span class="o">*</span> <span class="n">ENDMARKER</span> <span class="n">decorator</span><span class="p">:</span> <span class="s1">'@'</span> <span class="n">dotted_name</span> <span class="p">[</span> <span class="s1">'('</span> <span class="p">[</span><span class="n">arglist</span><span class="p">]</span> <span class="s1">')'</span> <span class="p">]</span> <span class="n">NEWLINE</span> <span class="n">decorators</span><span class="p">:</span> <span class="n">decorator</span><span class="o">+</span> <span class="n">decorated</span><span class="p">:</span> <span class="n">decorators</span> <span class="p">(</span><span class="n">classdef</span> <span class="o">|</span> <span class="n">funcdef</span><span class="p">)</span> <span class="n">funcdef</span><span class="p">:</span> <span class="s1">'def'</span> <span class="n">NAME</span> <span class="n">parameters</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="n">parameters</span><span class="p">:</span> <span class="s1">'('</span> <span class="p">[</span><span class="n">varargslist</span><span class="p">]</span> <span class="s1">')'</span> <span class="n">varargslist</span><span class="p">:</span> <span class="p">((</span><span class="n">fpdef</span> <span class="p">[</span><span class="s1">'='</span> <span class="n">test</span><span class="p">]</span> <span class="s1">','</span><span class="p">)</span><span class="o">*</span> <span class="p">(</span><span class="s1">'*'</span> <span class="n">NAME</span> <span class="p">[</span><span class="s1">','</span> <span class="s1">'**'</span> <span class="n">NAME</span><span class="p">]</span> <span class="o">|</span> <span class="s1">'**'</span> <span class="n">NAME</span><span class="p">)</span> <span class="o">|</span> <span class="n">fpdef</span> <span class="p">[</span><span class="s1">'='</span> <span class="n">test</span><span class="p">]</span> <span class="p">(</span><span class="s1">','</span> <span class="n">fpdef</span> <span class="p">[</span><span class="s1">'='</span> <span class="n">test</span><span class="p">])</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">])</span> <span class="n">fpdef</span><span class="p">:</span> <span class="n">NAME</span> <span class="o">|</span> <span class="s1">'('</span> <span class="n">fplist</span> <span class="s1">')'</span> <span class="n">fplist</span><span class="p">:</span> <span class="n">fpdef</span> <span class="p">(</span><span class="s1">','</span> <span class="n">fpdef</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="n">stmt</span><span class="p">:</span> <span class="n">simple_stmt</span> <span class="o">|</span> <span class="n">compound_stmt</span> <span class="n">simple_stmt</span><span class="p">:</span> <span class="n">small_stmt</span> <span class="p">(</span><span class="s1">';'</span> <span class="n">small_stmt</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">';'</span><span class="p">]</span> <span class="n">NEWLINE</span> <span class="n">small_stmt</span><span class="p">:</span> <span class="p">(</span><span class="n">expr_stmt</span> <span class="o">|</span> <span class="n">print_stmt</span> <span class="o">|</span> <span class="n">del_stmt</span> <span class="o">|</span> <span class="n">pass_stmt</span> <span class="o">|</span> <span class="n">flow_stmt</span> <span class="o">|</span> <span class="n">import_stmt</span> <span class="o">|</span> <span class="n">global_stmt</span> <span class="o">|</span> <span class="n">exec_stmt</span> <span class="o">|</span> <span class="n">assert_stmt</span><span class="p">)</span> <span class="n">expr_stmt</span><span class="p">:</span> <span class="n">testlist</span> <span class="p">(</span><span class="n">augassign</span> <span class="p">(</span><span class="n">yield_expr</span><span class="o">|</span><span class="n">testlist</span><span class="p">)</span> <span class="o">|</span> <span class="p">(</span><span class="s1">'='</span> <span class="p">(</span><span class="n">yield_expr</span><span class="o">|</span><span class="n">testlist</span><span class="p">))</span><span class="o">*</span><span class="p">)</span> <span class="n">augassign</span><span class="p">:</span> <span class="p">(</span><span class="s1">'+='</span> <span class="o">|</span> <span class="s1">'-='</span> <span class="o">|</span> <span class="s1">'*='</span> <span class="o">|</span> <span class="s1">'/='</span> <span class="o">|</span> <span class="s1">'%='</span> <span class="o">|</span> <span class="s1">'&='</span> <span class="o">|</span> <span class="s1">'|='</span> <span class="o">|</span> <span class="s1">'^='</span> <span class="o">|</span> <span class="s1">'<<='</span> <span class="o">|</span> <span class="s1">'>>='</span> <span class="o">|</span> <span class="s1">'**='</span> <span class="o">|</span> <span class="s1">'//='</span><span class="p">)</span> <span class="c1"># For normal assignments, additional restrictions enforced by the interpreter</span> <span class="n">print_stmt</span><span class="p">:</span> <span class="s1">'print'</span> <span class="p">(</span> <span class="p">[</span> <span class="n">test</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="p">]</span> <span class="o">|</span> <span class="s1">'>>'</span> <span class="n">test</span> <span class="p">[</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">+</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="p">]</span> <span class="p">)</span> <span class="n">del_stmt</span><span class="p">:</span> <span class="s1">'del'</span> <span class="n">exprlist</span> <span class="n">pass_stmt</span><span class="p">:</span> <span class="s1">'pass'</span> <span class="n">flow_stmt</span><span class="p">:</span> <span class="n">break_stmt</span> <span class="o">|</span> <span class="n">continue_stmt</span> <span class="o">|</span> <span class="n">return_stmt</span> <span class="o">|</span> <span class="n">raise_stmt</span> <span class="o">|</span> <span class="n">yield_stmt</span> <span class="n">break_stmt</span><span class="p">:</span> <span class="s1">'break'</span> <span class="n">continue_stmt</span><span class="p">:</span> <span class="s1">'continue'</span> <span class="n">return_stmt</span><span class="p">:</span> <span class="s1">'return'</span> <span class="p">[</span><span class="n">testlist</span><span class="p">]</span> <span class="n">yield_stmt</span><span class="p">:</span> <span class="n">yield_expr</span> <span class="n">raise_stmt</span><span class="p">:</span> <span class="s1">'raise'</span> <span class="p">[</span><span class="n">test</span> <span class="p">[</span><span class="s1">','</span> <span class="n">test</span> <span class="p">[</span><span class="s1">','</span> <span class="n">test</span><span class="p">]]]</span> <span class="n">import_stmt</span><span class="p">:</span> <span class="n">import_name</span> <span class="o">|</span> <span class="n">import_from</span> <span class="n">import_name</span><span class="p">:</span> <span class="s1">'import'</span> <span class="n">dotted_as_names</span> <span class="n">import_from</span><span class="p">:</span> <span class="p">(</span><span class="s1">'from'</span> <span class="p">(</span><span class="s1">'.'</span><span class="o">*</span> <span class="n">dotted_name</span> <span class="o">|</span> <span class="s1">'.'</span><span class="o">+</span><span class="p">)</span> <span class="s1">'import'</span> <span class="p">(</span><span class="s1">'*'</span> <span class="o">|</span> <span class="s1">'('</span> <span class="n">import_as_names</span> <span class="s1">')'</span> <span class="o">|</span> <span class="n">import_as_names</span><span class="p">))</span> <span class="n">import_as_name</span><span class="p">:</span> <span class="n">NAME</span> <span class="p">[</span><span class="s1">'as'</span> <span class="n">NAME</span><span class="p">]</span> <span class="n">dotted_as_name</span><span class="p">:</span> <span class="n">dotted_name</span> <span class="p">[</span><span class="s1">'as'</span> <span class="n">NAME</span><span class="p">]</span> <span class="n">import_as_names</span><span class="p">:</span> <span class="n">import_as_name</span> <span class="p">(</span><span class="s1">','</span> <span class="n">import_as_name</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="n">dotted_as_names</span><span class="p">:</span> <span class="n">dotted_as_name</span> <span class="p">(</span><span class="s1">','</span> <span class="n">dotted_as_name</span><span class="p">)</span><span class="o">*</span> <span class="n">dotted_name</span><span class="p">:</span> <span class="n">NAME</span> <span class="p">(</span><span class="s1">'.'</span> <span class="n">NAME</span><span class="p">)</span><span class="o">*</span> <span class="n">global_stmt</span><span class="p">:</span> <span class="s1">'global'</span> <span class="n">NAME</span> <span class="p">(</span><span class="s1">','</span> <span class="n">NAME</span><span class="p">)</span><span class="o">*</span> <span class="n">exec_stmt</span><span class="p">:</span> <span class="s1">'exec'</span> <span class="n">expr</span> <span class="p">[</span><span class="s1">'in'</span> <span class="n">test</span> <span class="p">[</span><span class="s1">','</span> <span class="n">test</span><span class="p">]]</span> <span class="n">assert_stmt</span><span class="p">:</span> <span class="s1">'assert'</span> <span class="n">test</span> <span class="p">[</span><span class="s1">','</span> <span class="n">test</span><span class="p">]</span> <span class="n">compound_stmt</span><span class="p">:</span> <span class="n">if_stmt</span> <span class="o">|</span> <span class="n">while_stmt</span> <span class="o">|</span> <span class="n">for_stmt</span> <span class="o">|</span> <span class="n">try_stmt</span> <span class="o">|</span> <span class="n">with_stmt</span> <span class="o">|</span> <span class="n">funcdef</span> <span class="o">|</span> <span class="n">classdef</span> <span class="o">|</span> <span class="n">decorated</span> <span class="n">if_stmt</span><span class="p">:</span> <span class="s1">'if'</span> <span class="n">test</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="p">(</span><span class="s1">'elif'</span> <span class="n">test</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">'else'</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">]</span> <span class="n">while_stmt</span><span class="p">:</span> <span class="s1">'while'</span> <span class="n">test</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="p">[</span><span class="s1">'else'</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">]</span> <span class="n">for_stmt</span><span class="p">:</span> <span class="s1">'for'</span> <span class="n">exprlist</span> <span class="s1">'in'</span> <span class="n">testlist</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="p">[</span><span class="s1">'else'</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">]</span> <span class="n">try_stmt</span><span class="p">:</span> <span class="p">(</span><span class="s1">'try'</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="p">((</span><span class="n">except_clause</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">)</span><span class="o">+</span> <span class="p">[</span><span class="s1">'else'</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">]</span> <span class="p">[</span><span class="s1">'finally'</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">]</span> <span class="o">|</span> <span class="s1">'finally'</span> <span class="s1">':'</span> <span class="n">suite</span><span class="p">))</span> <span class="n">with_stmt</span><span class="p">:</span> <span class="s1">'with'</span> <span class="n">with_item</span> <span class="p">(</span><span class="s1">','</span> <span class="n">with_item</span><span class="p">)</span><span class="o">*</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="n">with_item</span><span class="p">:</span> <span class="n">test</span> <span class="p">[</span><span class="s1">'as'</span> <span class="n">expr</span><span class="p">]</span> <span class="c1"># NB compile.c makes sure that the default except clause is last</span> <span class="n">except_clause</span><span class="p">:</span> <span class="s1">'except'</span> <span class="p">[</span><span class="n">test</span> <span class="p">[(</span><span class="s1">'as'</span> <span class="o">|</span> <span class="s1">','</span><span class="p">)</span> <span class="n">test</span><span class="p">]]</span> <span class="n">suite</span><span class="p">:</span> <span class="n">simple_stmt</span> <span class="o">|</span> <span class="n">NEWLINE</span> <span class="n">INDENT</span> <span class="n">stmt</span><span class="o">+</span> <span class="n">DEDENT</span> <span class="c1"># Backward compatibility cruft to support:</span> <span class="c1"># [ x for x in lambda: True, lambda: False if x() ]</span> <span class="c1"># even while also allowing:</span> <span class="c1"># lambda x: 5 if x else 2</span> <span class="c1"># (But not a mix of the two)</span> <span class="n">testlist_safe</span><span class="p">:</span> <span class="n">old_test</span> <span class="p">[(</span><span class="s1">','</span> <span class="n">old_test</span><span class="p">)</span><span class="o">+</span> <span class="p">[</span><span class="s1">','</span><span class="p">]]</span> <span class="n">old_test</span><span class="p">:</span> <span class="n">or_test</span> <span class="o">|</span> <span class="n">old_lambdef</span> <span class="n">old_lambdef</span><span class="p">:</span> <span class="s1">'lambda'</span> <span class="p">[</span><span class="n">varargslist</span><span class="p">]</span> <span class="s1">':'</span> <span class="n">old_test</span> <span class="n">test</span><span class="p">:</span> <span class="n">or_test</span> <span class="p">[</span><span class="s1">'if'</span> <span class="n">or_test</span> <span class="s1">'else'</span> <span class="n">test</span><span class="p">]</span> <span class="o">|</span> <span class="n">lambdef</span> <span class="n">or_test</span><span class="p">:</span> <span class="n">and_test</span> <span class="p">(</span><span class="s1">'or'</span> <span class="n">and_test</span><span class="p">)</span><span class="o">*</span> <span class="n">and_test</span><span class="p">:</span> <span class="n">not_test</span> <span class="p">(</span><span class="s1">'and'</span> <span class="n">not_test</span><span class="p">)</span><span class="o">*</span> <span class="n">not_test</span><span class="p">:</span> <span class="s1">'not'</span> <span class="n">not_test</span> <span class="o">|</span> <span class="n">comparison</span> <span class="n">comparison</span><span class="p">:</span> <span class="n">expr</span> <span class="p">(</span><span class="n">comp_op</span> <span class="n">expr</span><span class="p">)</span><span class="o">*</span> <span class="n">comp_op</span><span class="p">:</span> <span class="s1">'<'</span><span class="o">|</span><span class="s1">'>'</span><span class="o">|</span><span class="s1">'=='</span><span class="o">|</span><span class="s1">'>='</span><span class="o">|</span><span class="s1">'<='</span><span class="o">|</span><span class="s1">'<>'</span><span class="o">|</span><span class="s1">'!='</span><span class="o">|</span><span class="s1">'in'</span><span class="o">|</span><span class="s1">'not'</span> <span class="s1">'in'</span><span class="o">|</span><span class="s1">'is'</span><span class="o">|</span><span class="s1">'is'</span> <span class="s1">'not'</span> <span class="n">expr</span><span class="p">:</span> <span class="n">xor_expr</span> <span class="p">(</span><span class="s1">'|'</span> <span class="n">xor_expr</span><span class="p">)</span><span class="o">*</span> <span class="n">xor_expr</span><span class="p">:</span> <span class="n">and_expr</span> <span class="p">(</span><span class="s1">'^'</span> <span class="n">and_expr</span><span class="p">)</span><span class="o">*</span> <span class="n">and_expr</span><span class="p">:</span> <span class="n">shift_expr</span> <span class="p">(</span><span class="s1">'&'</span> <span class="n">shift_expr</span><span class="p">)</span><span class="o">*</span> <span class="n">shift_expr</span><span class="p">:</span> <span class="n">arith_expr</span> <span class="p">((</span><span class="s1">'<<'</span><span class="o">|</span><span class="s1">'>>'</span><span class="p">)</span> <span class="n">arith_expr</span><span class="p">)</span><span class="o">*</span> <span class="n">arith_expr</span><span class="p">:</span> <span class="n">term</span> <span class="p">((</span><span class="s1">'+'</span><span class="o">|</span><span class="s1">'-'</span><span class="p">)</span> <span class="n">term</span><span class="p">)</span><span class="o">*</span> <span class="n">term</span><span class="p">:</span> <span class="n">factor</span> <span class="p">((</span><span class="s1">'*'</span><span class="o">|</span><span class="s1">'/'</span><span class="o">|</span><span class="s1">'%'</span><span class="o">|</span><span class="s1">'//'</span><span class="p">)</span> <span class="n">factor</span><span class="p">)</span><span class="o">*</span> <span class="n">factor</span><span class="p">:</span> <span class="p">(</span><span class="s1">'+'</span><span class="o">|</span><span class="s1">'-'</span><span class="o">|</span><span class="s1">'~'</span><span class="p">)</span> <span class="n">factor</span> <span class="o">|</span> <span class="n">power</span> <span class="n">power</span><span class="p">:</span> <span class="n">atom</span> <span class="n">trailer</span><span class="o">*</span> <span class="p">[</span><span class="s1">'**'</span> <span class="n">factor</span><span class="p">]</span> <span class="n">atom</span><span class="p">:</span> <span class="p">(</span><span class="s1">'('</span> <span class="p">[</span><span class="n">yield_expr</span><span class="o">|</span><span class="n">testlist_comp</span><span class="p">]</span> <span class="s1">')'</span> <span class="o">|</span> <span class="s1">'['</span> <span class="p">[</span><span class="n">listmaker</span><span class="p">]</span> <span class="s1">']'</span> <span class="o">|</span> <span class="s1">'{'</span> <span class="p">[</span><span class="n">dictorsetmaker</span><span class="p">]</span> <span class="s1">'}'</span> <span class="o">|</span> <span class="s1">'`'</span> <span class="n">testlist1</span> <span class="s1">'`'</span> <span class="o">|</span> <span class="n">NAME</span> <span class="o">|</span> <span class="n">NUMBER</span> <span class="o">|</span> <span class="n">STRING</span><span class="o">+</span><span class="p">)</span> <span class="n">listmaker</span><span class="p">:</span> <span class="n">test</span> <span class="p">(</span> <span class="n">list_for</span> <span class="o">|</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="p">)</span> <span class="n">testlist_comp</span><span class="p">:</span> <span class="n">test</span> <span class="p">(</span> <span class="n">comp_for</span> <span class="o">|</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="p">)</span> <span class="n">lambdef</span><span class="p">:</span> <span class="s1">'lambda'</span> <span class="p">[</span><span class="n">varargslist</span><span class="p">]</span> <span class="s1">':'</span> <span class="n">test</span> <span class="n">trailer</span><span class="p">:</span> <span class="s1">'('</span> <span class="p">[</span><span class="n">arglist</span><span class="p">]</span> <span class="s1">')'</span> <span class="o">|</span> <span class="s1">'['</span> <span class="n">subscriptlist</span> <span class="s1">']'</span> <span class="o">|</span> <span class="s1">'.'</span> <span class="n">NAME</span> <span class="n">subscriptlist</span><span class="p">:</span> <span class="n">subscript</span> <span class="p">(</span><span class="s1">','</span> <span class="n">subscript</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="n">subscript</span><span class="p">:</span> <span class="s1">'.'</span> <span class="s1">'.'</span> <span class="s1">'.'</span> <span class="o">|</span> <span class="n">test</span> <span class="o">|</span> <span class="p">[</span><span class="n">test</span><span class="p">]</span> <span class="s1">':'</span> <span class="p">[</span><span class="n">test</span><span class="p">]</span> <span class="p">[</span><span class="n">sliceop</span><span class="p">]</span> <span class="n">sliceop</span><span class="p">:</span> <span class="s1">':'</span> <span class="p">[</span><span class="n">test</span><span class="p">]</span> <span class="n">exprlist</span><span class="p">:</span> <span class="n">expr</span> <span class="p">(</span><span class="s1">','</span> <span class="n">expr</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="n">testlist</span><span class="p">:</span> <span class="n">test</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="n">dictorsetmaker</span><span class="p">:</span> <span class="p">(</span> <span class="p">(</span><span class="n">test</span> <span class="s1">':'</span> <span class="n">test</span> <span class="p">(</span><span class="n">comp_for</span> <span class="o">|</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span> <span class="s1">':'</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]))</span> <span class="o">|</span> <span class="p">(</span><span class="n">test</span> <span class="p">(</span><span class="n">comp_for</span> <span class="o">|</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span><span class="p">]))</span> <span class="p">)</span> <span class="n">classdef</span><span class="p">:</span> <span class="s1">'class'</span> <span class="n">NAME</span> <span class="p">[</span><span class="s1">'('</span> <span class="p">[</span><span class="n">testlist</span><span class="p">]</span> <span class="s1">')'</span><span class="p">]</span> <span class="s1">':'</span> <span class="n">suite</span> <span class="n">arglist</span><span class="p">:</span> <span class="p">(</span><span class="n">argument</span> <span class="s1">','</span><span class="p">)</span><span class="o">*</span> <span class="p">(</span><span class="n">argument</span> <span class="p">[</span><span class="s1">','</span><span class="p">]</span> <span class="o">|</span><span class="s1">'*'</span> <span class="n">test</span> <span class="p">(</span><span class="s1">','</span> <span class="n">argument</span><span class="p">)</span><span class="o">*</span> <span class="p">[</span><span class="s1">','</span> <span class="s1">'**'</span> <span class="n">test</span><span class="p">]</span> <span class="o">|</span><span class="s1">'**'</span> <span class="n">test</span><span class="p">)</span> <span class="c1"># The reason that keywords are test nodes instead of NAME is that using NAME</span> <span class="c1"># results in an ambiguity. ast.c makes sure it's a NAME.</span> <span class="n">argument</span><span class="p">:</span> <span class="n">test</span> <span class="p">[</span><span class="n">comp_for</span><span class="p">]</span> <span class="o">|</span> <span class="n">test</span> <span class="s1">'='</span> <span class="n">test</span> <span class="n">list_iter</span><span class="p">:</span> <span class="n">list_for</span> <span class="o">|</span> <span class="n">list_if</span> <span class="n">list_for</span><span class="p">:</span> <span class="s1">'for'</span> <span class="n">exprlist</span> <span class="s1">'in'</span> <span class="n">testlist_safe</span> <span class="p">[</span><span class="n">list_iter</span><span class="p">]</span> <span class="n">list_if</span><span class="p">:</span> <span class="s1">'if'</span> <span class="n">old_test</span> <span class="p">[</span><span class="n">list_iter</span><span class="p">]</span> <span class="n">comp_iter</span><span class="p">:</span> <span class="n">comp_for</span> <span class="o">|</span> <span class="n">comp_if</span> <span class="n">comp_for</span><span class="p">:</span> <span class="s1">'for'</span> <span class="n">exprlist</span> <span class="s1">'in'</span> <span class="n">or_test</span> <span class="p">[</span><span class="n">comp_iter</span><span class="p">]</span> <span class="n">comp_if</span><span class="p">:</span> <span class="s1">'if'</span> <span class="n">old_test</span> <span class="p">[</span><span class="n">comp_iter</span><span class="p">]</span> <span class="n">testlist1</span><span class="p">:</span> <span class="n">test</span> <span class="p">(</span><span class="s1">','</span> <span class="n">test</span><span class="p">)</span><span class="o">*</span> <span class="c1"># not used in grammar, but may appear in "node" passed from Parser to Compiler</span> <span class="n">encoding_decl</span><span class="p">:</span> <span class="n">NAME</span> <span class="n">yield_expr</span><span class="p">:</span> <span class="s1">'yield'</span> <span class="p">[</span><span class="n">testlist</span><span class="p">]</span> </pre></div> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="toplevel_components.html" title="previous chapter">8. 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