The Whatever Object
===================
An easy way to make lambdas by partial application of python operators.
Inspired by Perl 6 one, see http://perlcabal.org/syn/S02.html#The_Whatever_Object
Usage
-----
.. code:: python
from whatever import _, that
# get a list of guys names
names = map(_.name, guys)
names = map(that.name, guys)
odd = map(_ * 2 + 1, range(10))
squares = map(_ ** 2, range(100))
small_squares = filter(_ < 100, squares)
best = max(tries, key=_.score)
sort(guys, key=-that.height)
factorial = lambda n: reduce(_ * _, range(2, n+1))
NOTE: chained comparisons cannot be implemented since there is no boolean overloading in python.
CAVEATS
-------
In some special cases whatever can cause confusion:
.. code:: python
_.attr # this makes callable
obj._ # this fetches '_' attribute of obj
_[key] # this works too
d[_] # KeyError, most probably
_._ # short for attrgetter('_')
_[_] # short for lambda d, k: d[k]
if _ == 'Any value':
# You will get here, definitely
# `_ == something` produces callable, which is true
[1, 2, _ * 2, None].index('hi') # => 2, since bool(_ * 2 == 'hi') is True
Also, whatever sometimes fails on late binding:
.. code:: python
(_ * 2)('2') # -> NotImplemented
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"description": "The Whatever Object\n===================\n\nAn easy way to make lambdas by partial application of python operators.\n\nInspired by Perl 6 one, see http://perlcabal.org/syn/S02.html#The_Whatever_Object\n\n\nUsage\n-----\n\n.. code:: python\n\n from whatever import _, that\n\n # get a list of guys names\n names = map(_.name, guys)\n names = map(that.name, guys)\n\n odd = map(_ * 2 + 1, range(10))\n\n squares = map(_ ** 2, range(100))\n small_squares = filter(_ < 100, squares)\n\n best = max(tries, key=_.score)\n sort(guys, key=-that.height)\n\n factorial = lambda n: reduce(_ * _, range(2, n+1))\n\nNOTE: chained comparisons cannot be implemented since there is no boolean overloading in python.\n\n\nCAVEATS\n-------\n\nIn some special cases whatever can cause confusion:\n\n.. code:: python\n\n _.attr # this makes callable\n obj._ # this fetches '_' attribute of obj\n\n _[key] # this works too\n d[_] # KeyError, most probably\n\n _._ # short for attrgetter('_')\n _[_] # short for lambda d, k: d[k]\n\n if _ == 'Any value':\n # You will get here, definitely\n # `_ == something` produces callable, which is true\n\n [1, 2, _ * 2, None].index('hi') # => 2, since bool(_ * 2 == 'hi') is True\n\n\nAlso, whatever sometimes fails on late binding:\n\n.. code:: python\n\n (_ * 2)('2') # -> NotImplemented\n",
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