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Project Description

About this module

Wrapper module which provides iterable object with infix style method chaining.

Unreadble:

>>> filter(lambda y: y % 2, map(lambda x: x + 1, iterable))

Readable:

>>> iterable = react(iterable)
>>> iterable.map(lambda x: x + 1).filter(lambda y: y % 2)

How to install

Requires python2.6 or later (include python3.x). You need pip or distribute or setuptools:

$ pip install chainreaction

or use easy_install:

$ easy_install chainreaction

Recent changed

0.2.0

  • Supported python2.6 .
  • Changed to use itertools in ‘Chainable.filter/map’ methods in python2.x .

0.1.2

  • Supported ‘for’ statement.

How to use

The simplest and an only way to use this module is to call the react function. react is a factory function which looks up ‘__iter__’ / ‘__getitem__’ from an given iterable, and returns wrapped object.

Example to use:

>>> from chainreaction.reactor import react
>>> react("hello")
>>> react([1, 2, 3])
>>> react(iter([1, 2, 3])
>>> class DictLike(dict):pass
>>> react(DictLike())

Chainable object support any methods of its wrapped object, and try to wrap their return value. By convention, side effective methods return nothing, but chainable object returns its side affected object wrapped with appropriate wrappper. If iterator was passed into react, it would be consumed when it called any iterative methods.

Example to use:

>>> tobewrapped = "hello"
>>> wrapped = react(tobewrapped)
>>> wrapped = wrapped.upper().map(lambda c: ord(c))
>>> [chr(c) for c in wrapped.unwrap] = [c for c in tobewrapped.upper()]
True
>>> tobewrapped = [1, 2, 3]
>>> wrapped = react(tobewrapped)
>>> wrapped.append(4).count()
4
>>> len(tobewrapped)
4

If an iterator was given, this iterator would be consumed when it called any method:

>>> tobewrapped = iter([1,2,3])
>>> wrapped = react(tobewrapped)
>>> wrapped.count()
4
>>> len(list(tobewrapped))
0

Tiny percent encoding implementation example:

>>> test = bytes("hello world-._~", encoding="UTF-8")
>>> wrapped = react(test)
>>> safe = set()
>>> react("0123456789").foreach(lambda c: safe.add(ord(c)))
>>> react(range(ord('a'), ord('z') + 1)).foreach(lambda b: safe.add(b))
>>> react(range(ord('A'), ord('Z') + 1)).foreach(lambda b: safe.add(b))
>>> react("-._~").foreach(lambda c: safe.add(ord(c)))
>>> test = wrapped.map(lambda b: b if b > 0 else 256 + b)
>>> test = test.map(lambda i: '+' if chr(i).isspace() else chr(i) if i in safe else "%{0:x}".format(i))
>>> test.tostring == "hello+world-._~"
True

Basic API

  • unwrap
    Retrieves iterable from wrapped object.
  • dump
    Elements dump.
  • isiterator
    True if wrapped object is iterator.
  • tostring
    Returns almost same with “”.join((str(x) for x in iterable)). This method always returns str object. str wrapped returns unwrapped, bytes or bytearray wrapped returns str converted, dict wrapped returns “key=value” pairs joined with “&”.
  • foreach(f)
    Applies a given f to all elements.
  • filter(pred)
    Selects all elements which satisfy a given predicate.
  • map(f)
    Builds a new collection by applying a given f.
  • forall(pred)
    True if all elements satisfy a given predicate.
  • forany(pred)
    True if any elements satisfy a given predicate.
  • dropwhile(pred)
    Drops longest prefix of elements that satisfy a given predicate.
  • dropright(pred)
    Drops longest suffix of elements that satisfy a given predicate.
  • takwhile(pred)
    Takes longest prefix of elements that satisfy a given predicate.
  • takeright(pred)
    Takes longest suffix of elements that satisfy a given predicate.
  • mkstring(joiner=”“)
    Returns wrapped str object using a joiner string.
  • counts(pred=lambda x: True)
    Counts the number of elements that satisfy a given predicate.
  • contains(key)
    Tests whether this wrapped object contains a given key as an element.
  • reduce(f)
    Returns a value(not wrapped) using a given f.

iterator specific API

  • tolist
    Returns a new list wrapped.
  • totuple
    Returns a new tuple wrapped.
  • toset
    Returns a new set wrapped.

str, bytes, bytearray specific API

  • reverse
    Returns a new reversed str wrapped.

seq specific API

  • accumulate(f)
    Returns a seq of accumulated value.
  • reverse
    Returns a new reversed seq wrapped.
  • sort
    Returns a new sorted seq wrapped.
  • toset
    Returns a new set wrapped.

set specific API

  • min
    Returns a minimum value.
  • max
    Returns a maximum value.
Release History

Release History

0.2.0

This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

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0.1.2

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TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

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0.1.1

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

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0.1.0

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

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Download Files

Download Files

TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
chainreaction-0.2.0.tar.gz (15.3 kB) Copy SHA256 Checksum SHA256 Source Aug 4, 2011
chainreaction-0.2.0.zip (21.1 kB) Copy SHA256 Checksum SHA256 Source May 31, 2012

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