Re: InteractiveConsole and namespace

2010-08-29 Thread Arnaud Delobelle 
Chris Rebert c...@rebertia.com writes:

 On Sat, Aug 28, 2010 at 2:37 PM, David ROBERT da...@ombrepixel.com wrote:
 Hi all,

 I want to use an InteractiveConsole at some stage in a program to
 interact with the local namespace: access, but also modify objects.
 When the interactive console ends (ctrl-d) I want the program to
 continue processing with the variables that may have been modified
 interactively.

[...]
 However, on the other code below (the console is invoked from within a
 function block), during the interactive session, I can read value of
 a, I can change value of a. But the local namespace of the function is
 not updated:

 import code
 def test():
    a=1
    c = code.InteractiveConsole(locals())
    c.interact() # Here I interactively change the value of a (a=2)
    print Value of a: , a

 if __name__ == '__main__':
    test()

 print returns -- Value of a: 1

 I need to run the InteractiveConsole from a function block. I tried
 different things with the local and parent frames (sys._getframe())
 but nothing successful. If I put a in the global namespace it works,
 but I would like to
 [...]
 understand what the
 problem is.

 Read http://docs.python.org/library/functions.html#locals (emphasis added):

 locals()
 [...]
 Note: The contents of this dictionary should not be modified;
[...]

Here is a solution:

def test():
a=1
loc = dict(locals())
c = code.InteractiveConsole(loc)
c.interact() # Here I interactively change the value of a (a=2)
for key in loc:
if key != '__builtins__':
exec %s = loc[%r] % (key, key)
print Value of a: , a

HTH

-- 
Arnaud
-- 
http://mail.python.org/mailman/listinfo/python-list

InteractiveConsole and namespace

2010-08-28 Thread David ROBERT 
Hi all,

I want to use an InteractiveConsole at some stage in a program to
interact with the local namespace: access, but also modify objects.
When the interactive console ends (ctrl-d) I want the program to
continue processing with the variables that may have been modified
interactively.

The code below works (block invoking the console is not in a
function). During the interactive session, I can read value of a, I
can change value of a and the new value is updated in the block
namespace.

import code
if __name__ == '__main__':
a=1
c = code.InteractiveConsole(locals())
c.interact()  # Here I interactively change the value of a (a=2)
print Value of a: , a

print returns -- Value of a: 2

However, on the other code below (the console is invoked from within a
function block), during the interactive session, I can read value of
a, I can change value of a. But the local namespace of the function is
not updated:

import code
def test():
a=1
c = code.InteractiveConsole(locals())
c.interact() # Here I interactively change the value of a (a=2)
print Value of a: , a

if __name__ == '__main__':
test()

print returns -- Value of a: 1

I need to run the InteractiveConsole from a function block. I tried
different things with the local and parent frames (sys._getframe())
but nothing successful. If I put a in the global namespace it works,
but I would like to find a nicer solution and also understand what the
problem is.

Thanks for any help

-- 
David ROBERT
http://blog.ombrepixel.com/
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: InteractiveConsole and namespace

2010-08-28 Thread Chris Rebert 
On Sat, Aug 28, 2010 at 2:37 PM, David ROBERT da...@ombrepixel.com wrote:
 Hi all,

 I want to use an InteractiveConsole at some stage in a program to
 interact with the local namespace: access, but also modify objects.
 When the interactive console ends (ctrl-d) I want the program to
 continue processing with the variables that may have been modified
 interactively.

 The code below works (block invoking the console is not in a
 function). During the interactive session, I can read value of a, I
 can change value of a and the new value is updated in the block
 namespace.

 import code
 if __name__ == '__main__':
    a=1
    c = code.InteractiveConsole(locals())
    c.interact()  # Here I interactively change the value of a (a=2)
    print Value of a: , a

 print returns -- Value of a: 2

 However, on the other code below (the console is invoked from within a
 function block), during the interactive session, I can read value of
 a, I can change value of a. But the local namespace of the function is
 not updated:

 import code
 def test():
    a=1
    c = code.InteractiveConsole(locals())
    c.interact() # Here I interactively change the value of a (a=2)
    print Value of a: , a

 if __name__ == '__main__':
    test()

 print returns -- Value of a: 1

 I need to run the InteractiveConsole from a function block. I tried
 different things with the local and parent frames (sys._getframe())
 but nothing successful. If I put a in the global namespace it works,
 but I would like to
[...]
 understand what the
 problem is.

Read http://docs.python.org/library/functions.html#locals (emphasis added):

locals()
[...]
Note: The contents of this dictionary should not be modified;
***changes may not affect the values of local and free variables used
by the interpreter***.

At the top-level / module scope, it just so happens that `locals() is
globals() == True`; and unlike locals(), globals() does not have the
aforequoted limitation.

I don't know if there's a non-ugly workaround.

Cheers,
Chris
--
http://blog.rebertia.com
-- 
http://mail.python.org/mailman/listinfo/python-list