docstr: Takes an iterable of items and filters them so that only items which
  are contained within this specifier are allowed in it.
docstr_tok: ["Takes","an","iterable","of","items","and","filters","them","so","that","only","items","which","are","contained","within","this","specifier","are","allowed","in","it","."]
code: def filter(
      self,
      iterable: Iterable[UnparsedVersionVar],
      prereleases: Optional[bool] = None,
  ) -> Iterator[UnparsedVersionVar]:
      """
      Takes an iterable of items and filters them so that only items which
      are contained within this specifier are allowed in it.
      """
  
imports: import abc
  import itertools
  import re
  from typing import Callable, Iterable, Iterator, List, Optional, Tuple, TypeVar, Union
  from .utils import canonicalize_version
  from .version import Version
label_desc: Use image node_id 7 for calling the BaseSpecifier obj's underlying member method code with example usage: obj.filter(iterable, prereleases) without return types