class_docstr: Enhanced 'build_py' command that includes data files with packages
  
  The data files are specified via a 'package_data' argument to 'setup()'.
  See 'setuptools.dist.Distribution' for more details.
  
  Also, this version of the 'build_py' command allows you to specify both
  'py_modules' and 'packages' in the same setup operation.
code: def get_package_dir(self, package):
      res = orig.build_py.get_package_dir(self, package)
      if self.distribution.src_root is not None:
          return os.path.join(self.distribution.src_root, res)
      return res
  
imports: from glob import glob
  from distutils.util import convert_path
  import distutils.command.build_py
  import os
  import fnmatch
  import textwrap
  import io
  import distutils.errors
  import itertools
  from setuptools.extern import six
  from setuptools.extern.six.moves import map, filter, filterfalse
label_desc: Use image node_id 13 for calling the build_py obj's underlying member method code with example usage: obj.get_package_dir(package) and returns: res, os