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<H1><A NAME="SECTION008100000000000000000"></A>
<BR>
6.1 Expression statements 
</H1>
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<P>
Expression statements are used (mostly interactively) to compute and
write a value, or (usually) to call a procedure (a function that
returns no meaningful result; in Python, procedures return the value
<tt>None</tt>).  Other uses of expression statements are allowed and
occasionally useful.  The syntax for an expression statement is:

<P>
<dl><dd><pre class=verbatim>
expression_stmt: expression_list
</pre></dl>

<P>
An expression statement evaluates the expression list (which may be a
single expression).
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<P>
In interactive mode, if the value is not <tt>None</tt>, it is converted
to a string using the built-in <tt class=function>repr()</tt><a name="l2h-563"></a>
function and the resulting string is written to standard output (see
section <A HREF="print.html#print">6.6</A>) on a line by itself.  (Expression statements
yielding None are not written, so that procedure calls do not cause
any output.)
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