1  # coding: utf-8
   2  """Compatibility tricks for Python 3. Mainly to do with unicode.
   3  
   4  This file is deprecated and will be removed in a future version.
   5  """
   6  import platform
   7  import builtins as builtin_mod
   8  
   9  from .encoding import DEFAULT_ENCODING
  10  
  11  
  12  def decode(s, encoding=None):
  13      encoding = encoding or DEFAULT_ENCODING
  14      return s.decode(encoding, "replace")
  15  
  16  
  17  def encode(u, encoding=None):
  18      encoding = encoding or DEFAULT_ENCODING
  19      return u.encode(encoding, "replace")
  20  
  21  
  22  def cast_unicode(s, encoding=None):
  23      if isinstance(s, bytes):
  24          return decode(s, encoding)
  25      return s
  26  
  27  
  28  def safe_unicode(e):
  29      """unicode(e) with various fallbacks. Used for exceptions, which may not be
  30      safe to call unicode() on.
  31      """
  32      try:
  33          return str(e)
  34      except UnicodeError:
  35          pass
  36  
  37      try:
  38          return repr(e)
  39      except UnicodeError:
  40          pass
  41  
  42      return "Unrecoverably corrupt evalue"
  43  
  44  
  45  # keep reference to builtin_mod because the kernel overrides that value
  46  # to forward requests to a frontend.
  47  def input(prompt=""):
  48      return builtin_mod.input(prompt)
  49  
  50  
  51  def execfile(fname, glob, loc=None, compiler=None):
  52      loc = loc if (loc is not None) else glob
  53      with open(fname, "rb") as f:
  54          compiler = compiler or compile
  55          exec(compiler(f.read(), fname, "exec"), glob, loc)
  56  
  57  
  58  PYPY = platform.python_implementation() == "PyPy"
  59  
  60  
  61  # Cython still rely on that as a Dec 28 2019
  62  # See https://github.com/cython/cython/pull/3291 and
  63  # https://github.com/ipython/ipython/issues/12068
  64  def no_code(x, encoding=None):
  65      return x
  66  
  67  
  68  unicode_to_str = cast_bytes_py2 = no_code
  69