compiler.walk() what am I missing?
skip at pobox.com
skip at pobox.com
Tue Jul 11 16:06:41 EDT 2006
Here's a trivial little Python session which attempts to use compiler.walk
(mostly unsuccessfully):
% python
Python 2.4.2 (#1, Feb 23 2006, 12:48:31)
[GCC 3.4.1] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import compiler
>>> ast = compiler.parse(open("a.py").read())
>>> ast
Module(None, Stmt([Assign([AssName('RED', 'OP_ASSIGN')], Const('red')), Assign([AssName('BLUE', 'OP_ASSIGN')], Const('blue'))]))
>>> compiler.walk(ast, compiler.visitor.ExampleASTVisitor, verbose=10)
>>> <class compiler.visitor.ExampleASTVisitor at 0x831ce3c>
>>> compiler.walk(ast, compiler.visitor.ExampleASTVisitor(), verbose=10)
<compiler.visitor.ExampleASTVisitor instance at 0x81f0eac>
I did manage to get a verbose print the first time I executed this:
>>> compiler.walk(ast, compiler.visitor.ExampleASTVisitor(), walker=compiler.visitor.ExampleASTVisitor(), verbose=10)
which emitted nice verbose stuff like
dispatch Module
<compiler.visitor.ExampleASTVisitor instance at 0x835074c>
compiler.ast.Module
asList <bound method Module.asList of Module(None, Stmt([Assign([AssName('RED', 'OP_ASSIGN')], Const('red')), Assign([AssName('BLUE', 'OP_ASSIGN')], Const('blue'))]))>
doc None
getChildNode <bound method Module.getChildNodes of Module(None, Stmt([Assign([AssName('RED', 'OP_ASSIGN')], Const('red')), Assign([AssName('BLUE', 'OP_ASSIGN')], Const('blue'))]))>
getChildren <bound method Module.getChildren of Module(None, Stmt([Assign([AssName('RED', 'OP_ASSIGN')], Const('red')), Assign([AssName('BLUE', 'OP_ASSIGN')], Const('blue'))]))>
lineno None
...
but successive calls just yielded the more electron-conserving:
dispatch Module
dispatch Stmt
dispatch Assign
dispatch AssName
dispatch Const
dispatch Assign
dispatch AssName
dispatch Const
What am I doing wrong?
Thanks,
Skip
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