exec - return value of expression

[Peter Otten]

Christoph Groth wrote:

> 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:
> 
>>>> f = create_some_formula()
>>>> tex(f)   # Prettyprint the formula
> 
> But typing tex( ) all the time is a bit annoying, I would like that
> the following works inside my texmacs-plugin.
> 
>>>> f = create_some_formula()
>>>> f  # Prettyprint the formula

Have a look at sys.displayhook:

>>> import sys, __builtin__
>>> def myhook(a):
...     if a is not None:
...             __builtin__._ = a
...             sys.stdout.write("python proudly presents: %s\n" % a)
...
>>> sys.displayhook = myhook
>>> 1
python proudly presents: 1
>>>

Peter