docs: def find_linux_venv_py_version():
      """Find python version name used in this virtualenv.
  
      For example: ``python2.7``, ``python3.4``
      """
      available_python_version = [
          "python2.6",
          "python2.7",
          "python3.3",
          "python3.4",
          "python3.5",
          "python3.6",
      ]
      dir_path = os.path.dirname(SRC)
      for basename in os.listdir(os.path.join(dir_path, BIN_SCRIPTS)):
          for python_version in available_python_version:
              if python_version in basename:
                  return python_version
      raise Exception("Can't find virtualenv python version!")