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# Stubs for itertools
# Based on http://docs.python.org/3.2/library/itertools.html
from typing import (Iterator, TypeVar, Iterable, overload, Any, Callable, Tuple,
Union, Sequence, Generic, Optional)
_T = TypeVar('_T')
_S = TypeVar('_S')
def count(start: int = ...,
step: int = ...) -> Iterator[int]: ... # more general types?
def cycle(iterable: Iterable[_T]) -> Iterator[_T]: ...
@overload
def repeat(object: _T) -> Iterator[_T]: ...
@overload
def repeat(object: _T, times: int) -> Iterator[_T]: ...
def accumulate(iterable: Iterable[_T]) -> Iterator[_T]: ...
class chain(Iterator[_T], Generic[_T]):
def __init__(self, *iterables: Iterable[_T]) -> None: ...
def __next__(self) -> _T: ...
def __iter__(self) -> Iterator[_T]: ...
@staticmethod
def from_iterable(iterable: Iterable[Iterable[_S]]) -> Iterator[_S]: ...
def compress(data: Iterable[_T], selectors: Iterable[Any]) -> Iterator[_T]: ...
def dropwhile(predicate: Callable[[_T], Any],
iterable: Iterable[_T]) -> Iterator[_T]: ...
def filterfalse(predicate: Callable[[_T], Any],
iterable: Iterable[_T]) -> Iterator[_T]: ...
@overload
def groupby(iterable: Iterable[_T]) -> Iterator[Tuple[_T, Iterator[_T]]]: ...
@overload
def groupby(iterable: Iterable[_T],
key: Callable[[_T], _S]) -> Iterator[Tuple[_S, Iterator[_T]]]: ...
@overload
def islice(iterable: Iterable[_T], stop: int) -> Iterator[_T]: ...
@overload
def islice(iterable: Iterable[_T], start: int, stop: Optional[int],
step: int = ...) -> Iterator[_T]: ...
def starmap(func: Any, iterable: Iterable[Any]) -> Iterator[Any]: ...
def takewhile(predicate: Callable[[_T], Any],
iterable: Iterable[_T]) -> Iterator[_T]: ...
def tee(iterable: Iterable[Any], n: int = ...) -> Iterator[Any]: ...
def zip_longest(*p: Iterable[Any],
fillvalue: Any = ...) -> Iterator[Any]: ...
# TODO: Return type should be Iterator[Tuple[..]], but unknown tuple shape.
# Iterator[Sequence[_T]] loses this type information.
def product(*p: Iterable[_T], repeat: int = ...) -> Iterator[Sequence[_T]]: ...
def permutations(iterable: Iterable[_T],
r: Union[int, None] = ...) -> Iterator[Sequence[_T]]: ...
def combinations(iterable: Iterable[_T],
r: int) -> Iterable[Sequence[_T]]: ...
def combinations_with_replacement(iterable: Iterable[_T],
r: int) -> Iterable[Sequence[_T]]: ...
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