README.rst

Lazy calculations for Python

This Python module realize part of lazy calculations in functional programing paradigm, based on iterators.

Main part of module is class Iterator

Relised base commands to work with list of items:

• map - for map iterable object items
• filter - for filter iterable object items
• remove - ignore items of iterable object
• groupby - for join items by many states in items sequance

Example

Base use:

import lazy

iterable_object = r'string iterate by symbol'
for ch in lazy.Iterator(iterable_object):
    print ch

Use methods:

• map:

  import lazy
  iterable_object = r'string iterate by symbol'
  out = r''
  for ch in lazy.Iterator(iterable_object).map(
    lambda x: r'b' if x == r's' else x):
      out += ch
  print out  # r'btring iterate by bymbol'

• filter:

  import lazy
  iterable_object = r'string iterate by symbol'
  out = r''
  for ch in lazy.Iterator(iterable_object).filter(lambda x: x != r' '):
      out += ch
  print out  # r'stringiteratebysymbol'

• remove:

  import lazy
  iterable_object = r'string iterate by symbol'
  out = r''
  for ch in lazy.Iterator(iterable_object).remove(r' ').remove(
    [r'i', r'o', r'a', r'e', r'y']):
      out += ch
  print out  # r'strngtrtbsmbl'

• groupby:

  import lazy
  iterable_object = r'string iterate by symbol'
  out = []
  for ch in lazy.Iterator(iterable_object).groupby(
    lambda x, b, s: r'space' if x == r' ' else r'word', False):
      out.append(r''.join(ch))
  print out  # [r'string', r' ', r'iterate', r' ', r'by', r' ', r'symbol']