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Diffstat (limited to 'Doc')
-rw-r--r-- | Doc/tut/tut.tex | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex index 659ffb7..0a26d6b 100644 --- a/Doc/tut/tut.tex +++ b/Doc/tut/tut.tex @@ -1577,6 +1577,24 @@ def fprintf(file, format, *args): \end{verbatim} +\subsection{Unpacking Argument Lists \label{unpacking-arguments}} + +The reverse situation occurs when the arguments are already in a list +or tuple but need to be unpacked for a function call requiring separate +positional arguments. For instance, the built-in \function{range()} +function expects separate \var{start} and \var{stop} arguments. If they +are not available separately, write the function call with the +\code{*}-operator to unpack the arguments out of a list or tuple: + +\begin{verbatim} +>>> range(3, 6) # normal call with separate arguments +[3, 4, 5] +>>> args = [3, 6] +>>> range(*args) # call with arguments unpacked from a list +[3, 4, 5] +\end{verbatim} + + \subsection{Lambda Forms \label{lambda}} By popular demand, a few features commonly found in functional |