1  """
       2  Constants for generating the layout.
       3  """
       4  
       5  __author__ = "Steve Dower <steve.dower@python.org>"
       6  __version__ = "3.8"
       7  
       8  import os
       9  import struct
      10  import sys
      11  
      12  
      13  def _unpack_hexversion():
      14      try:
      15          hexversion = int(os.getenv("PYTHON_HEXVERSION"), 16)
      16      except (TypeError, ValueError):
      17          hexversion = sys.hexversion
      18      return struct.pack(">i", hexversion)
      19  
      20  
      21  def _get_suffix(field4):
      22      name = {0xA0: "a", 0xB0: "b", 0xC0: "rc"}.get(field4 & 0xF0, "")
      23      if name:
      24          serial = field4 & 0x0F
      25          return f"{name}{serial}"
      26      return ""
      27  
      28  
      29  VER_MAJOR, VER_MINOR, VER_MICRO, VER_FIELD4 = _unpack_hexversion()
      30  VER_SUFFIX = _get_suffix(VER_FIELD4)
      31  VER_FIELD3 = VER_MICRO << 8 | VER_FIELD4
      32  VER_DOT = "{}.{}".format(VER_MAJOR, VER_MINOR)
      33  
      34  PYTHON_DLL_NAME = "python{}{}.dll".format(VER_MAJOR, VER_MINOR)
      35  PYTHON_STABLE_DLL_NAME = "python{}.dll".format(VER_MAJOR)
      36  PYTHON_ZIP_NAME = "python{}{}.zip".format(VER_MAJOR, VER_MINOR)
      37  PYTHON_PTH_NAME = "python{}{}._pth".format(VER_MAJOR, VER_MINOR)
      38  
      39  PYTHON_CHM_NAME = "python{}{}{}{}.chm".format(
      40      VER_MAJOR, VER_MINOR, VER_MICRO, VER_SUFFIX
      41  )