[IPython-dev] Closing in on 0.11? We need some review/feedback help

[Gökhan Sever]

On Sun, Jan 17, 2010 at 7:27 PM, Fernando Perez <fperez.net at gmail.com>wrote:

> On Sat, Jan 16, 2010 at 9:48 PM, Gökhan Sever <gokhansever at gmail.com>
> wrote:
> > 1- Look in the history in the reverse order to obtain the latest entry of
> > the same variable assignment. Each element listed in the history output
> is a
> > separate string pulled out of a list.
> >
> > 2- Compare the "string".split("=")[0] with each variable name in %whos
> call.
> >
> > 3-Write the output in the 4th column of the whos listing (using a one of
> the
> > names: "Assignment", "Command", "History"):
> >
> > Variable   Type    Data/Info    Assignment
> > --------------------------------------------------
> > a              int        5               a=5
> > n              float     0.0             n = math.sin(0)
> >
> > Data/Info column usually produces longer lines this might cause some ugly
> > looking output.
> >
> > Could I get some suggestions?
>
> Well, sounds like you have a plan, go ahead and implement it :)
>
> Some pointers:
>
> - get the global ipython object via get_ipython()
> - its .user_ns is your user namespace.
> - in there, the 'In' variable contains your inputs.
>
> I'd just add this as a normal function initially loaded in your
> startup file.  Once it's working the way you want it, you just need a
> few lines to expose it as a magic for convenience.
>
> Cheers,
> f
>

I placed the following a few lines of code into magic_whos() in magic.py:

        cmdlist = {}
        for cmd in self.get_ipython().user_ns['In']:
            for vn in varnames:
                if cmd.split("=")[0].rstrip() == vn:
                    cmdlist[vn] = str(cmd.strip())

        print cmdlist


Here is a mini demo:

In [1]: a=5

In [2]: whos
{'a': 'a=5'}
Variable   Type    Data/Info
----------------------------
a          int     5

In [3]: a = abs(1-2+3-4+5-6+7-8+9-10)

In [4]: whos
{'a': 'a = abs(1-2+3-4+5-6+7-8+9-10)'}
Variable   Type    Data/Info
----------------------------
a          int     5


We need a smart and clear space for this new column. Putting under each
variable makes it look uglier. Putting next to Data/Info on a new column
titled "Command" needs some smart length checking. Alternatively, the
outputs could be embedded into the Data/Info fields directly.

-- 
Gökhan
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