bw2data.backends.json#

Submodules#

Package Contents#

Classes#

Activity

A MutableMapping is a generic container for associating

Exchange

Simple proxy for an exchange between activity datasets. Makes manipulation and use in command line more convenient.

JSONDatabase

A data store for LCI databases. Stores each dataset in a separate file, serialized to JSON.
class bw2data.backends.json.Activity(key, data={})[source]#

Bases: bw2data.proxies.ActivityProxyBase

Inheritance diagram of bw2data.backends.json.Activity

A MutableMapping is a generic container for associating key/value pairs.

This class provides concrete generic implementations of all methods except for __getitem__, __setitem__, __delitem__, __iter__, and __len__.

biosphere(raw=False)#
exchanges(raw=False)#
save()#
technosphere(raw=False)#
upstream(*args, **kwargs)#
class bw2data.backends.json.Exchange(data, *args, **kwargs)#

Bases: bw2data.proxies.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 activity, but you can instantiate one with the dictionary of exchange data and an Activity proxy of the consuming activity:

exchange = Exchange({"my exchange data": "goes here"})

Properties:

  • input: Returns activity

  • output: Returns activity

  • amount

  • uncertainty: Returns dictionary of uncertainty data

  • uncertainty_type: Returns stats_arrays uncertainty type

  • unit

save()#
class bw2data.backends.json.JSONDatabase(name)[source]#

Bases: bw2data.backends.base.LCIBackend

Inheritance diagram of bw2data.backends.json.JSONDatabase

A data store for LCI databases. Stores each dataset in a separate file, serialized to JSON.

Instead of loading all the data at once, .load() creates a SynchronousJSONDict, which loads values on demand.

Use this backend by setting "backend":"json" in the database metadata. This is done automatically if you call .register() from this class.

backend = 'json'#
filepath_intermediate()#
get(code)#

Get Activity proxy for this dataset

load(as_dict=False, *args, **kwargs)#

Instantiate SynchronousJSONDict for this database.

register(**kwargs)#

Register a database with the metadata store, using the correct value for backend, and creates database directory.

write(data, process=True)#

Serialize data to disk. Most of the time, this data has already been saved to disk, so this is a no-op. The only exception is if data is a new database dictionary.

Normalizes units when found.

Parameters

data (*) – Inventory data