.. py:function:: pydu.iter.first(iterable)
Get the first item in the iterable.
>>> from pydu.iter import first
>>> first([1, 2])
1
.. py:function:: pydu.iter.last(iterable)
Get the last item in the iterable.
Warning, this can be slow due to iter step by step to last one.
>>> from pydu.iter import last
>>> last([1, 2])
2
.. py:function:: pydu.iter.all(iterable, predicate)
Returns True if all elements in the given iterable are True for the
given predicate function.
>>> from pydu.iter import all
>>> all([0, 1, 2], lambda x: x+1)
True
.. py:function:: pydu.iter.any(iterable)
Returns True if any element in the given iterable is True for the
given predicate function.
>>> from pydu.iter import any
>>> any([-1, -1, 0], lambda x: x+1)
True
.. py:function:: pydu.iter.join(iterable, separator='')
Join each item of iterable to string.
>>> from pydu.iter import join
>>> join([1, '2', 3], separator=',')
'1,2,3'