Re: Import a module without executing it?

[Kent Johnson]

Andy, this is a nice example. It prompted me to look at the docs for compiler.visitor. The docs are, 
um, pretty bad. I'm going to attempt to clean them up a little. Would you mind if I include this 
example?

Thanks,
Kent
Andy Gross wrote:
Here's a quick example that will pull out all functions defined in the 
top-level of a module:

---
#/usr/bin/env python
from compiler import parse, walk
from compiler.visitor import ASTVisitor
testdata = r'''
def aFunction(anArg):
    return anArg + 1
'''
class SimpleVisitor(ASTVisitor):
    def visitFunction(self, parsedFunc):
        print "Function %(name)s at %(lineno)s takes %(argnames)s " \
              " with code %(code)s" % parsedFunc.__dict__
if __name__ == "__main__":
    ast = parse(testdata)
    walk(ast, SimpleVisitor(), verbose=True)
---
[EMAIL PROTECTED]:~$ ./test.py
Function aFunction at 2 takes ['anArg']  with code 
Stmt([Return(Add((Name('anArg'), Const(1))))])

HTH,
/arg
On Dec 7, 2004, at 11:14 PM, Caleb Hattingh wrote:
Andy
thx for that.  I had a file called 'tktest.py' lying around, and I did:
'>>> a = compiler.parseFile('tktest.py')
And "a" looks something like this:
***
Stmt([Import([('Tkinter', None)]), Function(None, 'add_rows', ['w', 
'titles', 'rows'], [], 0, None, 
Stmt([Discard(CallFunc(Getattr(Name('w'), 'configure'), 
[Keyword('state', Const('normal'))], None, None)), For(AssName('r', 
'OP_ASSIGN'), Name('rows'), Stmt([For(AssTuple([AssName('t', 
'OP_ASSIGN'), AssName('v', 'OP_ASSIGN')]), CallFunc(Name('zip'), 
[Name('titles'), Name('r')], None, None), 
Stmt([Discard(CallFunc(Getattr(Name('w'), 'insert'), [Const('end'), 
Mod((Const('%s:\t%s\n'), Tuple([Name('t'), Name('v')])))], None, 
None))]), None), Discard(CallFunc(Getattr(Name('w'), 'insert'), 
[Const('end'), Const('\n')], None, None))]), None), 
Discard(CallFunc(Getattr(Name('w'), 'configure'), [Keyword('state', 
Const('disabled'))], None, None))])), Assign([AssName('app', 
'OP_ASSIGN')], CallFunc(Getattr(Name('Tkinter'), 'Tk'), [], None, 
None)), Assign([AssName('t', 'OP_ASSIGN')], 
CallFunc(Getattr(Name('Tkinter'), 'Text'), [Name('app'), 
Keyword('state', Const('disabled'))], None, None)), 
Discard(CallFunc(Getattr(Name('t'), 'pack'), [], None, None)), 
Assign([AssName('info', 'OP_ASSIGN')], List([List([Const('Ali'), 
Const(18)]), List([Const('Zainab'), Const(16)]), 
List([Const('Khalid'), Const(18)])])), 
Discard(CallFunc(Name('add_rows'), [Name('t'), List([Const('Name'), 
Const('Age')]), Name('info')], None, None)), 
Discard(CallFunc(Getattr(Name('app'), 'mainloop'), [], None, None))])
***

Pretty impressive :)
Do you know of more batteries that can process this stuff further, for 
interest sake (and maybe the OP)?

thx again
Caleb
On Tue, 7 Dec 2004 15:57:16 -0500, Andy Gross <[EMAIL PROTECTED]> wrote:
You'll want to use the "compiler" package.  compiler.parseFile will 
return an AST that you can inspect (which is not really 'reflection', 
btw).

/arg
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