old_contents: # http://codeliberates.blogspot.com/2008/05/detecting-cpuscores-in-python.html
  def detectCPUs():
      import os
      """
      Detects the number of CPUs on a system. Cribbed from pp.
      """
  
  # Linux, Unix and MacOS:
      if hasattr(os, "sysconf"):
          if os.sysconf_names.has_key("SC_NPROCESSORS_ONLN"):
              # Linux & Unix:
              ncpus = os.sysconf("SC_NPROCESSORS_ONLN")
              if isinstance(ncpus, int) and ncpus > 0:
                  return ncpus
          else: # OSX:
              return int(os.popen2("sysctl -n hw.ncpu")[1].read())
      # Windows:
      if os.environ.has_key("NUMBER_OF_PROCESSORS"):
          ncpus = int(os.environ["NUMBER_OF_PROCESSORS"]);
          if ncpus > 0:
              return ncpus
      return 1 # Default
  
  def usingIcecream():
      import os
      try:
          return int(os.environ['USE_ICECC']) == 1
      except KeyError:
          return False
  
  # if using the icecc distributed compiler stuff just set cores to 5
  if usingIcecream():
      print("5")
  else:
      print(detectCPUs())
  
new_contents: # http://codeliberates.blogspot.com/2008/05/detecting-cpuscores-in-python.html
  def detectCPUs():
      import os
      """
      Detects the number of CPUs on a system. Cribbed from pp.
      """
  
  # Linux, Unix and MacOS:
      if hasattr(os, "sysconf"):
          if "SC_NPROCESSORS_ONLN" in os.sysconf_names:
              # Linux & Unix:
              ncpus = os.sysconf("SC_NPROCESSORS_ONLN")
              if isinstance(ncpus, int) and ncpus > 0:
                  return ncpus
          else: # OSX:
              return int(os.popen2("sysctl -n hw.ncpu")[1].read())
      # Windows:
      if "NUMBER_OF_PROCESSORS" in os.environ:
          ncpus = int(os.environ["NUMBER_OF_PROCESSORS"]);
          if ncpus > 0:
              return ncpus
      return 1 # Default
  
  def usingIcecream():
      import os
      try:
          return int(os.environ['USE_ICECC']) == 1
      except KeyError:
          return False
  
  # if using the icecc distributed compiler stuff just set cores to 5
  if usingIcecream():
      print("5")
  else:
      print(detectCPUs())
  
subject: replace has_key with in for python3