projects / OpenSPARC-T2-SAM / blame
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| 55 | <H1><A NAME="SECTION008100000000000000000"></A><A NAME="exprstmts"></A> | |
| 56 | <BR> | |
| 57 | 6.1 Expression statements | |
| 58 | </H1> | |
| 59 | <a id='l2h-452' xml:id='l2h-452'></a> | |
| 60 | <P> | |
| 61 | Expression statements are used (mostly interactively) to compute and | |
| 62 | write a value, or (usually) to call a procedure (a function that | |
| 63 | returns no meaningful result; in Python, procedures return the value | |
| 64 | <code>None</code>). Other uses of expression statements are allowed and | |
| 65 | occasionally useful. The syntax for an expression statement is: | |
| 66 | ||
| 67 | <P> | |
| 68 | <dl><dd class="grammar"> | |
| 69 | <div class="productions"> | |
| 70 | <table> | |
| 71 | <tr> | |
| 72 | <td><a id='tok-expression_stmt' xml:id='tok-expression_stmt'>expression_stmt</a></td> | |
| 73 | <td>::=</td> | |
| 74 | <td><a class='grammartoken' href="exprlists.html#tok-expression_list">expression_list</a></td></tr> | |
| 75 | </table> | |
| 76 | </div> | |
| 77 | <a class="grammar-footer" | |
| 78 | href="grammar.txt" type="text/plain" | |
| 79 | >Download entire grammar as text.</a> | |
| 80 | </dd></dl> | |
| 81 | ||
| 82 | <P> | |
| 83 | An expression statement evaluates the expression list (which may be a | |
| 84 | single expression). | |
| 85 | <a id='l2h-453' xml:id='l2h-453'></a> | |
| 86 | <P> | |
| 87 | In interactive mode, if the value is not <code>None</code>, it is converted | |
| 88 | to a string using the built-in <tt class="function">repr()</tt><a id='l2h-454' xml:id='l2h-454'></a>function and the resulting string is written to standard output (see | |
| 89 | section <A href="print.html#print">6.6</A>) on a line by itself. (Expression statements | |
| 90 | yielding <code>None</code> are not written, so that procedure calls do not | |
| 91 | cause any output.) | |
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| 130 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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