old_contents: # Used in setup.py, so don't pull any additional dependencies
  #
  # Based on:
  #   - https://github.com/python/mypy/blob/master/mypy/version.py
  #   - https://github.com/python/mypy/blob/master/mypy/git.py
  import os
  import subprocess
  
  _BASE_VERSION = "2.0.0a4"
  
  
  def _generate_version(base_version):
      """Generate a version with information about the Git repository."""
      pkg_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  
      if not _is_git_repo(pkg_dir) or not _have_git():
          return base_version
  
      if _is_release(pkg_dir, base_version) and not _is_dirty(pkg_dir):
          return base_version
  
      return "{base_version}+{short_sha}{dirty}".format(
          base_version=base_version,
          short_sha=_git_revision(pkg_dir).decode("utf-8")[0:6],
          dirty=".mod" if _is_dirty(pkg_dir) else "",
      )
  
  
  def _is_git_repo(dir_path):
      """Is the given directory version-controlled with Git?"""
      return os.path.exists(os.path.join(dir_path, ".git"))
  
  
  def _have_git():
      """Can we run the git executable?"""
      try:
          subprocess.check_output(["git", "--help"])
          return True
      except subprocess.CalledProcessError:
          return False
      except OSError:
          return False
  
  
  def _is_release(dir_path, base_version):
      try:
          output = subprocess.check_output(
              ["git", "describe", "--tags", "--exact-match"],
              cwd=dir_path,
              stderr=subprocess.STDOUT,
          ).decode("utf-8")
          tag = output.strip()
          return tag == base_version
      except subprocess.CalledProcessError:
          return False
  
  
  def _git_revision(dir_path):
      """Get SHA of the HEAD of a Git repository."""
      return subprocess.check_output(
          ["git", "rev-parse", "HEAD"], cwd=dir_path
      ).strip()
  
  
  def _is_dirty(dir_path):
      """Check whether a git repository has uncommitted changes."""
      try:
          subprocess.check_call(["git", "diff", "--quiet"], cwd=dir_path)
          return False
      except subprocess.CalledProcessError:
          return True
  
  
  __version__ = _generate_version(_BASE_VERSION)
  
new_contents: # Used in setup.py, so don't pull any additional dependencies
  #
  # Based on:
  #   - https://github.com/python/mypy/blob/master/mypy/version.py
  #   - https://github.com/python/mypy/blob/master/mypy/git.py
  import os
  import subprocess
  
  _BASE_VERSION = "2.0.0"
  
  
  def _generate_version(base_version):
      """Generate a version with information about the Git repository."""
      pkg_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  
      if not _is_git_repo(pkg_dir) or not _have_git():
          return base_version
  
      if _is_release(pkg_dir, base_version) and not _is_dirty(pkg_dir):
          return base_version
  
      return "{base_version}+{short_sha}{dirty}".format(
          base_version=base_version,
          short_sha=_git_revision(pkg_dir).decode("utf-8")[0:6],
          dirty=".mod" if _is_dirty(pkg_dir) else "",
      )
  
  
  def _is_git_repo(dir_path):
      """Is the given directory version-controlled with Git?"""
      return os.path.exists(os.path.join(dir_path, ".git"))
  
  
  def _have_git():
      """Can we run the git executable?"""
      try:
          subprocess.check_output(["git", "--help"])
          return True
      except subprocess.CalledProcessError:
          return False
      except OSError:
          return False
  
  
  def _is_release(dir_path, base_version):
      try:
          output = subprocess.check_output(
              ["git", "describe", "--tags", "--exact-match"],
              cwd=dir_path,
              stderr=subprocess.STDOUT,
          ).decode("utf-8")
          tag = output.strip()
          return tag == base_version
      except subprocess.CalledProcessError:
          return False
  
  
  def _git_revision(dir_path):
      """Get SHA of the HEAD of a Git repository."""
      return subprocess.check_output(
          ["git", "rev-parse", "HEAD"], cwd=dir_path
      ).strip()
  
  
  def _is_dirty(dir_path):
      """Check whether a git repository has uncommitted changes."""
      try:
          subprocess.check_call(["git", "diff", "--quiet"], cwd=dir_path)
          return False
      except subprocess.CalledProcessError:
          return True
  
  
  __version__ = _generate_version(_BASE_VERSION)
  
subject: bump to 2.0.0