projects / OpenSPARC-T2-SAM / blame
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| 54 | ||
| 55 | <H1><A NAME="SECTION008700000000000000000"></A><A NAME="return"></A> | |
| 56 | <BR> | |
| 57 | 6.7 The <tt class="keyword">return</tt> statement | |
| 58 | </H1> | |
| 59 | <a id='l2h-506' xml:id='l2h-506'></a> | |
| 60 | <P> | |
| 61 | <dl><dd class="grammar"> | |
| 62 | <div class="productions"> | |
| 63 | <table> | |
| 64 | <tr> | |
| 65 | <td><a id='tok-return_stmt' xml:id='tok-return_stmt'>return_stmt</a></td> | |
| 66 | <td>::=</td> | |
| 67 | <td>"return" [<a class='grammartoken' href="exprlists.html#tok-expression_list">expression_list</a>]</td></tr> | |
| 68 | </table> | |
| 69 | </div> | |
| 70 | <a class="grammar-footer" | |
| 71 | href="grammar.txt" type="text/plain" | |
| 72 | >Download entire grammar as text.</a> | |
| 73 | </dd></dl> | |
| 74 | ||
| 75 | <P> | |
| 76 | <tt class="keyword">return</tt> may only occur syntactically nested in a function | |
| 77 | definition, not within a nested class definition. | |
| 78 | <a id='l2h-507' xml:id='l2h-507'></a><a id='l2h-508' xml:id='l2h-508'></a> | |
| 79 | <P> | |
| 80 | If an expression list is present, it is evaluated, else <code>None</code> | |
| 81 | is substituted. | |
| 82 | ||
| 83 | <P> | |
| 84 | <tt class="keyword">return</tt> leaves the current function call with the expression | |
| 85 | list (or <code>None</code>) as return value. | |
| 86 | ||
| 87 | <P> | |
| 88 | When <tt class="keyword">return</tt> passes control out of a <tt class="keyword">try</tt> statement | |
| 89 | with a <tt class="keyword">finally</tt> clause, that <tt class="keyword">finally</tt> clause is executed | |
| 90 | before really leaving the function. | |
| 91 | <a id='l2h-509' xml:id='l2h-509'></a> | |
| 92 | <P> | |
| 93 | In a generator function, the <tt class="keyword">return</tt> statement is not allowed | |
| 94 | to include an <a class='grammartoken' href="exprlists.html#tok-expression_list">expression_list</a>. In that context, a bare | |
| 95 | <tt class="keyword">return</tt> indicates that the generator is done and will cause | |
| 96 | <tt class="exception">StopIteration</tt> to be raised. | |
| 97 | ||
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| 134 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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