docstr: Determines if the given item is contained within this specifier.
docstr_tok: ["Determines","if","the","given","item","is","contained","within","this","specifier","."]
code: def contains(
      self, item: str, prereleases: Optional[bool] = None
  ) -> bool:
      """
      Determines if the given item is contained within this specifier.
      """
  
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 6 for calling the BaseSpecifier obj's underlying member method code with example usage: obj.contains(item, prereleases) without return types