code: def get_uid(user=None):
      '''
      Get the uid for a given user name. If no user given, the current euid will
      be returned. If the user does not exist, None will be returned. On systems
      which do not support pwd or os.geteuid, None will be returned.
      '''
      if not HAS_PWD:
          return None
      elif user is None:
          try:
              return os.geteuid()
          except AttributeError:
              return None
      else:
          try:
              return pwd.getpwnam(user).pw_uid
          except KeyError:
              return Nonf get_uid(user=None):
      '''
      Get the uid for a given user name. If no user given, the current euid will
      be returned. If the user does not exist, None will be returned. On systems
      which do not support pwd or os.geteuid, None will be returned.
      '''
      if not HAS_PWD:
          return None
      elif user is None:
          try:
              return os.geteuid()
          except AttributeError:
              return None
      else:
          try:
              return pwd.getpwnam(user).pw_uid
          except KeyError:
              return None
docs: Get the uid for a given user name. If no user given, the current euid will
      be returned. If the user does not exist, None will be returned. On systems
      which do not support pwd or os.geteuid, None will be returned.