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\section{Standard Module \sectcode{code}}
\label{module-code}
\stmodindex{code}
The \code{code} module defines operations pertaining to Python code
objects.
The \code{code} module defines the following functions:
\begin{funcdesc}{compile_command}{source, \optional{filename\optional{, symbol}}}
This function is useful for programs that want to emulate Python's
interpreter main loop (a.k.a. the read-eval-print loop). The tricky
part is to determine when the user has entered an incomplete command
that can be completed by entering more text (as opposed to a complete
command or a syntax error). This function \emph{almost} always makes
the same decision as the real interpreter main loop.
Arguments: \var{source} is the source string; \var{filename} is the
optional filename from which source was read, defaulting to
\code{"<input>"}; and \var{symbol} is the optional grammar start
symbol, which should be either \code{"single"} (the default) or
\code{"eval"}.
Return a code object (the same as \code{compile(\var{source},
\var{filename}, \var{symbol})}) if the command is complete and valid;
return \code{None} if the command is incomplete; raise
\code{SyntaxError} if the command is a syntax error.
\end{funcdesc}
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