code: def versions_from_parentdir(parentdir_prefix, root, verbose):
      """Try to determine the version from the parent directory name.
  
      Source tarballs conventionally unpack into a directory that includes
      both the project name and a version string.
      """
      dirname = os.path.basename(root)
      if not dirname.startswith(parentdir_prefix):
          if verbose:
              print(
                  "guessing rootdir is '%s', but '%s' doesn't start with "
                  "prefix '%s'" % (root, dirname, parentdir_prefix)
              )
          raise NotThisMethod(
              "rootdir doesn't start with parentdir_prefix"
          )
      return {
          "version": dirname[len(parentdir_prefix) :],
          "full-revisionid": None,
          "dirty": False,
          "error": None,
      }
  
imports: import errno
  import os
  import re
  import subprocess
  import sys
label_desc: Use image node_id 5 for calling a global function with example usage: versions_from_parentdir(parentdir_prefix, root, verbose) and returns: dict