f_it
Iterator class for functional-esque, postfix-chaining programming.
Features
- A single wrapper class exposing chain-able methods for lazily transforming iterators
- Wraps functions from
functools,itertools, and some extras - Optionally has a length, which is calculated for subsequent operations if possible
Note that this package is for convenience/ interface comfort purposes and does not provide the guarantees of a true functional language.
There may be a significant performance overhead to using deeply nested FIt instances in tight loops;
see the benchmarks executed by pytest.
Usage
from f_it import FIt
it = FIt(range(10))
transformed = it.map( # cube elements
lambda x: x**3
).filter( # drop even elements
lambda x: x % 2
).cycle( # repeat the whole iterator 3 times
3
).islice( # take some elements from the middle
5, 10
).chain( # add 0-4 to the end
range(5)
).chunk( # separate into 2-length chunks
2
)
# __add__ and __radd__ are implemented for chaining other Iterators
added = transformed + iter([1, 2, 3])
# nothing has been evaluated yet!
# evaluate operations, reading into a list
# if tqdm is available, show progress bar
as_list = added.progress().to(list)
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