(
        self,
        vc_class,  # type: Type[VersionControl]
        rev=None,  # type: Optional[str]
        extra_args=None,  # type: Optional[List[str]]
    )
Args:
          vc_class: a VersionControl subclass.
          rev: the name of the revision to install.
          extra_args: a list of extra options.
Args:
          vc_class: a VersionControl subclass.
          rev: the name of the revision to install.
          extra_args: a list of extra options.
Args : vc_class : a VersionControl subclass . rev : the name of the revision to install . extra_args : a list of extra options .
def __init__(
        self,
        vc_class,  # type: Type[VersionControl]
        rev=None,  # type: Optional[str]
        extra_args=None,  # type: Optional[List[str]]
    ):
        # type: (...) -> None
        """
        Args:
          vc_class: a VersionControl subclass.
          rev: the name of the revision to install.
          extra_args: a list of extra options.
        """
        if extra_args is None:
            extra_args = []

        self.extra_args = extra_args
        self.rev = rev
        self.vc_class = vc_class
def __init__ ( self , vc_class , # type: Type[VersionControl] rev = None , # type: Optional[str] extra_args = None , # type: Optional[List[str]] ) : # type: (...) -> None if extra_args is None : extra_args = [ ] self . extra_args = extra_args self . rev = rev self . vc_class = vc_class