collection#

Common collection classes.

Classes#

AttrDict

Sub-classes dict, and further allows attribute-like access to dictionary items.

Functions#

make_immutable(value)

first(seq[, key, default, apply])

Give the first value that satisfies the key test.

firstitem(map[, key, default, apply])

last(seq[, key, default, apply])

call_each(seq)

Calls each element of sequence to invoke the side effect.
make_immutable(value)#
class AttrDict(*args, **kwargs)#

Bases: dict

Sub-classes dict, and further allows attribute-like access to dictionary items.

Examples

>>> d = AttrDict({'a': 1})
>>> d.a, d['a'], d.get('a')
(1, 1, 1)
>>> d.b = 2
>>> d.b, d['b']
(2, 2)
first(seq, key=bool, default=None, apply=lambda x: ...)#

Give the first value that satisfies the key test.

Parameters:

  • seq (iterable)

  • key (callable) -- test for each element of iterable

  • default -- returned when all elements fail test

  • apply (callable) -- applied to element before return, but not to default value

Returns: first element in seq that passes key, mutated with optional apply

Examples

>>> first([0, False, None, [], (), 42])
42
>>> first([0, False, None, [], ()]) is None
True
>>> first([0, False, None, [], ()], default='ohai')
'ohai'
>>> import re
>>> m = first(re.match(regex, 'abc') for regex in ['b.*', 'a(.*)'])
>>> m.group(1)
'bc'

The optional key argument specifies a one-argument predicate function like that used for filter(). The key argument, if supplied, must be in keyword form. For example: >>> first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4

firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...)#
last(seq, key=bool, default=None, apply=lambda x: ...)#
call_each(seq)#

Calls each element of sequence to invoke the side effect.

Parameters:

seq

Returns: None