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[ch-2014-04] text for alternating-generator added #3

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[ch-2014-04] text for alternating-generator added
Mar 26, 2014
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26 changes: 26 additions & 0 deletions 2014/challenges/alternating-generator/README.md
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Алтерниращ генератор
--------------------

Да се напише генератор `alternate`, който приема **произволен брой аргументи**,
всеки от които връща обект итератор при извикването си. `alternate` се очаква
да генерира обекти като взима последователно първите елементи от върнатите от
аргументите итератори в същия ред, в който са подадени, после вторите, третите
и т.н.

## Примери ##

>>> mirror_count = alternate(lambda: itertools.count(1, 1), lambda: itertools.count(-1, -1))
>>> next(mirror_count)
1
>>> next(mirror_count)
-1
>>> next(mirror_count)
2
>>> next(mirror_count)
-2
>>> next(mirror_count)
3
>>> next(mirror_count)
-3
>>> next(mirror_count)
4