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from __builtin__ import property as _property, tuple as _tuple
from operator import itemgetter as _itemgetter
from collections import OrderedDict
[docs]class Point(tuple):
'Point(quantity, price)'
__slots__ = ()
_fields = ('quantity', 'price')
def __new__(_cls, quantity, price):
'Create new instance of Point(quantity, price)'
if (quantity < 0 or quantity is None):
raise ValueError('The quantity provided ({}) is an invalid value.'.format(quantity))
if (price < 0 or price is None):
raise ValueError('The price provided ({}) is an invalid value.'.format(price))
float_quantity = float(quantity)
float_price = float(price)
return _tuple.__new__(_cls, (float_quantity, float_price))
@classmethod
def _make(cls, iterable, new=tuple.__new__, len=len):
'Make a new Point object from a sequence or iterable'
result = new(cls, iterable)
if len(result) != 2:
raise TypeError('Expected 2 arguments, got %d' % len(result))
return result
def __repr__(self):
'Return a nicely formatted representation string'
return 'Point(quantity=%r, price=%r)' % self
def _asdict(self):
'Return a new OrderedDict which maps field names to their values'
return OrderedDict(zip(self._fields, self))
def _replace(_self, **kwds):
'Return a new Point object replacing specified fields with new values'
result = _self._make(map(kwds.pop, ('quantity', 'price'), _self))
if kwds:
raise ValueError('Got unexpected field names: %r' % kwds.keys())
return result
def __getnewargs__(self):
'Return self as a plain tuple. Used by copy and pickle.'
return tuple(self)
__dict__ = _property(_asdict)
def __getstate__(self):
'Exclude the OrderedDict from pickling'
pass
[docs] def tuppleize(self):
return (self.quantity, self.price)
quantity = _property(_itemgetter(0), doc='Alias for field number 0')
x = _property(_itemgetter(0), doc='Alias for field number 0')
price = _property(_itemgetter(1), doc='Alias for field number 1')
y = _property(_itemgetter(1), doc='Alias for field number 1')