Reference

lazysequence

Lazy sequences.

>>> from lazysequence import lazysequence
>>>
>>> def load_records():
...     return range(10)  # let's pretend this is expensive
...
>>> records = lazysequence(load_records())
>>> if not records:
...     raise SystemExit("no records found")
...
>>> first, second = records[:2]
>>>
>>> print("The first record is", first)
The first record is 0
>>> print("The second record is", second)
The second record is 1
>>>
>>> for record in records.release():  # do not cache all records in memory
...     print("record", record)
...
record 0
record 1
record 2
record 3
record 4
record 5
record 6
record 7
record 8
record 9

class lazysequence.lazysequence(iterable, *, _cache=None, _slice=_slice(start=None, stop=None, step=1))

A lazy sequence provides sequence operations on an iterable.

Parameters

• iterable (Iterable[_T_co]) – The iterable being wrapped.

• _cache (Optional[MutableSequence[_T_co]]) –

• _slice (_slice) –

Return type

None

release()

Iterate over the sequence without caching additional items.

The sequence should no longer be used after calling this function. The same applies to slices of the sequence obtained by using s[i:j].

Yields

The items in the sequence.

Return type

Iterator[lazysequence._T_co]