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Mention access to ASTs

This commit is contained in:
Andrew M. Kuchling 2006-04-12 12:16:31 +00:00
parent e29002ccb0
commit 4e86195a99
1 changed files with 14 additions and 1 deletions
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15
Doc/whatsnew/whatsnew25.tex
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@ -5,7 +5,6 @@
% Fix XXX comments % Fix XXX comments
% Distutils upload (PEP 243) % Distutils upload (PEP 243)
% The easy_install stuff % The easy_install stuff
% Access to ASTs with compile() flag
% Stateful codec changes % Stateful codec changes
% ASCII is now default encoding for modules % ASCII is now default encoding for modules
@ -1380,6 +1379,20 @@ no longer generate bytecode by traversing the parse tree. Instead
the parse tree is converted to an abstract syntax tree (or AST), and it is the parse tree is converted to an abstract syntax tree (or AST), and it is
the abstract syntax tree that's traversed to produce the bytecode. the abstract syntax tree that's traversed to produce the bytecode.
It's possible for Python code to obtain AST objects by using the
\function{compile()} built-in and specifying 0x400 as the value of the
\var{flags} parameter:
\begin{verbatim}
ast = compile("""a=0
for i in range(10):
a += i
""", "<string>", 'exec', 0x0400)
assignment = ast.body[0]
for_loop = ast.body[1]
\end{verbatim}
No documentation has been written for the AST code yet. To start No documentation has been written for the AST code yet. To start
learning about it, read the definition of the various AST nodes in learning about it, read the definition of the various AST nodes in
\file{Parser/Python.asdl}. A Python script reads this file and \file{Parser/Python.asdl}. A Python script reads this file and