Source code for bw2data.backends.single_file.proxies
# -*- coding: utf-8 -*-
from __future__ import print_function, unicode_literals
from eight import *
from ...proxies import ActivityProxyBase, ExchangeProxyBase
from ...utils import get_activity
[docs]
class Activity(ActivityProxyBase):
def __init__(self, key, data={}):
data["database"], data["code"] = key[0], key[1]
def __setitem__(self, key, value):
raise AttributeError("Activity proxies are read-only.")
[docs]
def save(self):
raise NotImplemented
[docs]
def exchanges(self):
return [Exchange(exc, self)
for exc in self._data.get(u'exchanges', [])]
[docs]
def technosphere(self):
return [Exchange(exc, self)
for exc in self._data.get(u'exchanges', [])
if exc.get('type') == 'technosphere']
[docs]
def biosphere(self):
return [Exchange(exc, self)
for exc in self._data.get(u'exchanges', [])
if exc.get('type') == 'biosphere']
[docs]
def upstream(self, *args, **kwargs):
raise NotImplemented
# -*- coding: utf-8 -*
[docs]
class Exchange(ExchangeProxyBase):
"""
Simple proxy for an exchange between activity datasets. Makes manipulation and use in command line more convenient.
.. warning:: This proxy is read only! To save changes to a dataset, you will need to work with the raw database data.
Usually these proxies are created by the :ref:`activity`, but you can instantiate one with the dictionary of exchange data and an Activity proxy of the consuming activity:
.. code-block:: python
exchange = Exchange({"my exchange data": "goes here"})
Properties:
* ``input``: Returns :ref:`activity`
* ``output``: Returns :ref:`activity`
* ``amount``
* ``uncertainty``: Returns dictionary of uncertainty data
* ``uncertainty_type``: Returns ``stats_arrays`` uncertainty type
* ``unit``
"""
def __setitem__(self, key, value):
raise AttributeError("Exchange proxies are read-only.")
[docs]
def save(self):
raise NotImplemented
