Disabling the magic "last expression" _ variable

[Koen Vossen]

A project I'm currently working on uses Turbogears as a framework. I'd
like to interact with it using the tg-admin shell. We also use gettext's
_() function for internationalization. Now, this function is overwritten
in interactive mode, which causes annoying exceptions. Is it possible to
disable this behavior?

[Peter Otten]

Koen Vossen wrote:

A project I'm currently working on uses Turbogears as a framework. I'd
like to interact with it using the tg-admin shell. We also use gettext's
_() function for internationalization. Now, this function is overwritten
in interactive mode, which causes annoying exceptions. Is it possible to
disable this behavior?

>>import sys
def displayhook(result):

.... if result is not None:
.... __builtins__._last = result
.... print result
....

>>"yadda"

yadda

>>_

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name '_' is not defined

>>_last

yadda

Peter

[Peter Otten]

Koen Vossen wrote:

A project I'm currently working on uses Turbogears as a framework. I'd
like to interact with it using the tg-admin shell. We also use gettext's
_() function for internationalization. Now, this function is overwritten
in interactive mode, which causes annoying exceptions. Is it possible to
disable this behavior?

[correct overzealous snip]

>>import sys
def displayhook(result):

.... if result is not None:
.... __builtins__._last = result
.... print result
....

>>sys.displayhook = displayhook
_

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name '_' is not defined

>>"yadda"

yadda

>>_

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name '_' is not defined

>>_last

yadda
Peter

[Ben Finney]

Peter Otten <__*******@web.dewrites:

>import sys
def displayhook(result):

... if result is not None:
... __builtins__._last = result
... print result
...

Better is to explicitly import the name '__builtin__'
<URL:http://www.python.org/doc/lib/module-builtin>. The name
'__builtins__' is an implementation detail not guaranteed to be
present in any particular implementation.

import __builtin__
import sys
def displayhook(result):
if result is not None:
__builtin__._last = result
print result

--
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Ben Finney