exec - return value of expression

**Josiah Carlson** · Jul 18 '05, 08:26 AM

Re: exec - return value of expression

> One solution would be to change the __repr__-Methods of the objects[color=blue]
> which are to be prettyprinted. This should work, but I would like to
> prettyprint some builtin objects too, like a list of formulas for
> example. And I don't know how to change the __repr__ of builtin
> lists.[/color]

Here's a kludge...if you are willing to manually instantiate all lists
first.
[color=blue][color=green][color=darkred]
>>> _list = list
>>> class list(_list):[/color][/color][/color]
.... def __repr__(self):
.... orig = _list.__repr__( self)
.... return "blah "+orig
....[color=blue][color=green][color=darkred]
>>> a = list()
>>> a[/color][/color][/color]
blah [][color=blue][color=green][color=darkred]
>>> a.append('hello ')
>>> a[/color][/color][/color]
blah ['hello'][color=blue][color=green][color=darkred]
>>> a.extend(['world', 'blah'])
>>> a[/color][/color][/color]
blah ['hello', 'world', 'blah']
[color=blue]
> Any hints on how to solve this Problem in an elegant way are greatly
> appreciated.[/color]

It is not elegant, but it may work for you.

- Josiah

**Peter Otten** · Jul 18 '05, 08:35 AM

Re: exec - return value of expression

Christoph Groth wrote:
[color=blue]
> Currently, if the user wants to print some formula, say, he has to
> execute a function called `tex' which packages the TeX-representation
> of the formula in a way understood by texmacs, like this:
>[color=green][color=darkred]
>>>> f = create_some_for mula()
>>>> tex(f) # Prettyprint the formula[/color][/color]
>
> But typing tex( ) all the time is a bit annoying, I would like that
> the following works inside my texmacs-plugin.
>[color=green][color=darkred]
>>>> f = create_some_for mula()
>>>> f # Prettyprint the formula[/color][/color][/color]

Have a look at sys.displayhook :
[color=blue][color=green][color=darkred]
>>> import sys, __builtin__
>>> def myhook(a):[/color][/color][/color]
.... if a is not None:
.... __builtin__._ = a
.... sys.stdout.writ e("python proudly presents: %s\n" % a)
....[color=blue][color=green][color=darkred]
>>> sys.displayhook = myhook
>>> 1[/color][/color][/color]
python proudly presents: 1[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

Peter

exec - return value of expression

exec - return value of expression

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