Strange _ behavior

[pavlenko-volodymyr]

Hi!
I ran your example and got this:

In [1]: from fn.iters import map
In [2]: from fn import _
In [3]: list(map(_ * 2, range(5)))
Out[3]: [0, 2, 4, 6, 8]
In [4]: list(map(_ * 2, range(5)))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-448bfa47eeda> in <module>()
----> 1 list(map(_ * 2, range(5)))
TypeError: 'list' object is not callable

python 2.7.3 windows 7 x64

[kachayev]

The problem is that _ means "latest output" in python interactive shells (both python and ipython). I.e.

>>> 1 + 1
2
>>> _
2

So, in your case you get in In [4] _ = [0, 2, 4, 6, 8] (list from Out[3]). Usually I advice to make import like

from fn import _ as __

when working in shells. In any case, I'll add this block to documentation and than close this ticket.

[kachayev]

Updated docs in this commit: bb70cf4

[pavlenko-volodymyr]

Thanks
But __ in ipython is empty string. So, it can be some misunderstanding with this.

[kachayev]

Change __ to X at 346adbd
Not very interesting solution, but there are so many special _* macros in IPython, that I don't see other way.