Examples¶

F and _ (singleton)¶

IPython uses _ as the previous output, so x is used here instead.

In [1]:

from placeholder import _ as x

x.real

from placeholder import _ as x x.real

Out[1]:

F(operator.attrgetter('real'))

In [2]:

nums = (0 + 2j), (1 + 1j), (2 + 0j)
min(nums, key=x.real)

nums = (0 + 2j), (1 + 1j), (2 + 0j) min(nums, key=x.real)

Out[2]:

2j

In [3]:

min(nums, key=x.imag)

min(nums, key=x.imag)

Out[3]:

(2+0j)

In [4]:

x[0]

x[0]

Out[4]:

F(operator.itemgetter(0))

In [5]:

pairs = 'ac', 'bb', 'ca'
min(pairs, key=x[0])

pairs = 'ac', 'bb', 'ca' min(pairs, key=x[0])

Out[5]:

'ac'

In [6]:

min(pairs, key=x[-1])

min(pairs, key=x[-1])

Out[6]:

'ca'

In [7]:

import itertools

list(itertools.accumulate(range(1, 6), x * x))

import itertools list(itertools.accumulate(range(1, 6), x * x))

Out[7]:

[1, 2, 6, 24, 120]

In [8]:

list(itertools.filterfalse(x % 2, range(10)))

list(itertools.filterfalse(x % 2, range(10)))

Out[8]:

[0, 2, 4, 6, 8]

In [9]:

list(filter(x % 2 == 0, range(10)))

list(filter(x % 2 == 0, range(10)))

Out[9]:

[0, 2, 4, 6, 8]

In [10]:

list(filter(abs(x) < 1, [-1, 0, 1]))

list(filter(abs(x) < 1, [-1, 0, 1]))

Out[10]:

[0]

M and m (singleton)¶

Support for attrgetter(*), itemgetter(*), and methodcaller.

In [11]:

from placeholder import m

m('real', 'imag')

from placeholder import m m('real', 'imag')

Out[11]:

F(operator.attrgetter('real', 'imag'))

In [12]:

m[0, -1]

m[0, -1]

Out[12]:

F(operator.itemgetter(0, -1))

In [13]:

m.split('-')

m.split('-')

Out[13]:

F(operator.methodcaller('split', '-'))