recall function definition from shell [Python]

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From: Peter Otten on 18 May 2010 15:08

superpollo wrote:

> Patrick Maupin ha scritto:
>> On May 18, 1:41 pm, superpollo <ute...(a)esempio.net> wrote:
>>> Patrick Maupin ha scritto:
>>>
>>>
>>>
>>>> On May 18, 12:31 pm, superpollo <ute...(a)esempio.net> wrote:
>>>>> >>> def myfun():
>>>>> ... return "WOW"
>>>>> ...
>>>>> >>> myfun()
>>>>> 'WOW'
>>>>> now, i would like to "list" the funcion definition, something like
>>>>> this:
>>>>> >>> myfun.somethinglikethis()
>>>>> def myfun():
>>>>> return "WOW"
>>>>> is there something like this around?
>>>>> bye
>>>> Sure, just give it a docstring and then you can call help on it:
>>>>>>> def myfun():
>>>> ... ''' myfun returns "WOW" when called.
>>>> ... This is just a Python __doc__ string
>>>> ... '''
>>>> ... return "WOW"
>>>> ...
>>>>>>> help(myfun)
>>>> Regards,
>>>> Pat
>>> mmm... thanks but not quite what i meant :-(
>>>
>>> bye
>>
>> Well, I don't think Python remembers exactly how you typed it in
>
> yes python does not, but maybe the *shell* does, or so i thought. i just
> wanted to dump the code for the function in a file, after i tested in
> the shell...

You could try ipython:

$ ipython
Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55)
Type "copyright", "credits" or "license" for more information.

IPython 0.10 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

In [1]: def f():
...: return 42
...:

In [2]: f()
Out[2]: 42

In [3]: %save tmp.py 1
The following commands were written to file `tmp.py`:
def f():
return 42

In [4]:
Do you really want to exit ([y]/n)?
$ cat tmp.py
def f():
return 42
$

Peter

From: superpollo on 18 May 2010 15:13

Peter Otten ha scritto:
> superpollo wrote:
>
>> Patrick Maupin ha scritto:
>>> On May 18, 1:41 pm, superpollo <ute...(a)esempio.net> wrote:
>>>> Patrick Maupin ha scritto:
>>>>
>>>>
>>>>
>>>>> On May 18, 12:31 pm, superpollo <ute...(a)esempio.net> wrote:
>>>>>> >>> def myfun():
>>>>>> ... return "WOW"
>>>>>> ...
>>>>>> >>> myfun()
>>>>>> 'WOW'
>>>>>> now, i would like to "list" the funcion definition, something like
>>>>>> this:
>>>>>> >>> myfun.somethinglikethis()
>>>>>> def myfun():
>>>>>> return "WOW"
>>>>>> is there something like this around?
>>>>>> bye
>>>>> Sure, just give it a docstring and then you can call help on it:
>>>>>>>> def myfun():
>>>>> ... ''' myfun returns "WOW" when called.
>>>>> ... This is just a Python __doc__ string
>>>>> ... '''
>>>>> ... return "WOW"
>>>>> ...
>>>>>>>> help(myfun)
>>>>> Regards,
>>>>> Pat
>>>> mmm... thanks but not quite what i meant :-(
>>>>
>>>> bye
>>> Well, I don't think Python remembers exactly how you typed it in
>> yes python does not, but maybe the *shell* does, or so i thought. i just
>> wanted to dump the code for the function in a file, after i tested in
>> the shell...
>
> You could try ipython:
>
> $ ipython
> Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55)
> Type "copyright", "credits" or "license" for more information.
>
> IPython 0.10 -- An enhanced Interactive Python.
> ? -> Introduction and overview of IPython's features.
> %quickref -> Quick reference.
> help -> Python's own help system.
> object? -> Details about 'object'. ?object also works, ?? prints more.
>
> In [1]: def f():
> ...: return 42
> ...:
>
> In [2]: f()
> Out[2]: 42
>
> In [3]: %save tmp.py 1
> The following commands were written to file `tmp.py`:
> def f():
> return 42
>
>
> In [4]:
> Do you really want to exit ([y]/n)?
> $ cat tmp.py
> def f():
> return 42
> $
>
> Peter

<RUNS TO APT-GET>

hey great! thanks a lot!

best regards

From: Ethan Furman on 18 May 2010 15:26

From: René 'Necoro' Neumann on 18 May 2010 15:21

Am 18.05.2010 20:55, schrieb superpollo:
>
> yes python does not, but maybe the *shell* does, or so i thought. i just
> wanted to dump the code for the function in a file, after i tested in
> the shell...

You might want to have a look at the IPython shell [1]. I personally do
not use it myself, but I thought to remember that it had some feature
like this (perhaps not dump _one function_, but all the input, which you
then only need to cleanup).

A quick glance revealed f.ex. the history and edit functionality [2] --
a bit more digging might really show up the thing you are looking for.

- RenÃ©

[1] http://ipython.scipy.org/
[2]
http://ipython.scipy.org/doc/manual/html/interactive/tutorial.html#source-code-handling-tips

From: Terry Reedy on 18 May 2010 22:36

On 5/18/2010 2:55 PM, superpollo wrote:

> yes python does not, but maybe the *shell* does, or so i thought. i just
> wanted to dump the code for the function in a file, after i tested in
> the shell...

On Windows, you can tell the shell (command window) how many lines to
remember. One can sensibly make this a lot higher on a gigabyte machine
than back in the 640K days. No idea about other systems.

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