def length_hint(obj, default=0):
 if (not isinstance(default, int)):
  msg = ("'%s' object cannot be interpreted as an integer" % type(default).__name__)
  raise TypeError(msg)
 try:
  return len(obj)
 except TypeError:
  pass
 try:
  hint = type(obj).__length_hint__
 except AttributeError:
  return default
 try:
  val = hint(obj)
 except TypeError:
  return default
 if (val is NotImplemented):
  return default
 if (not isinstance(val, int)):
  msg = ('__length_hint__ must be integer, not %s' % type(val).__name__)
  raise TypeError(msg)
 if (val < 0):
  msg = '__length_hint__() should return >= 0'
  raise ValueError(msg)
 return val

def length_hint ( obj , default = 0 ) : if ( not isinstance ( default , int ) ) : msg = ( "'%s' object cannot be interpreted as an integer" % type ( default ) . __name__ ) raise TypeError ( msg ) try : return len ( obj ) except TypeError : pass try : hint = type ( obj ) . __length_hint__ except AttributeError : return default try : val = hint ( obj ) except TypeError : return default if ( val is NotImplemented ) : return default if ( not isinstance ( val , int ) ) : msg = ( '__length_hint__ must be integer, not %s' % type ( val ) . __name__ ) raise TypeError ( msg ) if ( val < 0 ) : msg = '__length_hint__() should return >= 0' raise ValueError ( msg ) return val
return an estimate of the number of items in obj .