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clarify exec() vs. eval()

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Mark Pilgrim
2009-07-16 08:44:36 -04:00
parent 68fce064dc
commit 6ea8efa96f
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porting-code-to-python-3-with-2to3.html
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@@ -611,7 +611,7 @@ reduce(a, b, c)</code></pre>
<h2 id=exec><code>exec</code> statement</h2>
<p>Just as <a href=#print>the <code>print</code> statement</a> became a function in Python 3, so too has the <code><dfn>exec</dfn></code> statement. The <code>exec()</code> function takes a string which contains arbitrary Python code and executes it as if it were just another statement or expression.
<p>Just as <a href=#print>the <code>print</code> statement</a> became a function in Python 3, so too has the <code><dfn>exec</dfn></code> statement. The <code>exec()</code> function takes a string which contains arbitrary Python code and executes it as if it were just another statement or expression. <code>exec()</code> is like <a href=advanced-iterators.html#eval><code>eval()</code></a>, but even more powerful and evil. The <code>eval()</code> function can only evaluate a single expression, but <code>exec()</code> can execute multiple statements, imports, function declarations&nbsp;&mdash;&nbsp;essentially an entire Python program in a string.
<table>
<tr><th>Notes