### Running Brightway2 Setup (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This function initializes the necessary directories and default databases for Brightway2. It should be run once per installation or project setup.

```python
bi.bw2setup()
```

--------------------------------

### Initializing Brightway2 LCA (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This snippet creates an LCA object using the prepared demand and data objects. This object holds the matrices and setup for the LCA calculation.

```python
lca = bc.LCA(demand=demand, data_objs=data_objs)
```

--------------------------------

### Viewing Brightway2 Function Help (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This uses the IPython/Jupyter '?' magic command to display the docstring and help information for the `bd.prepare_lca_inputs` function.

```python
bd.prepare_lca_inputs?
```

--------------------------------

### Initializing Exiobase Importer (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This snippet creates an instance of the Exiobase3MonetaryImporter. It requires the path to the Exiobase data file and a name for the database to be created in Brightway2.

```python
ex = Exiobase3MonetaryImporter(
    Path("/Users/cmutel/Documents/LCA/EXIOBASE/3.8.1/IOT_2015_pxp"), 
    "Exiobase 3.8.1 Monetary 2015"
)
```

--------------------------------

### Preparing LCA Inputs (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This function prepares the necessary demand dictionary and data objects (matrices, methods) required to initialize a Brightway2 LCA calculation.

```python
demand, data_objs, _ = bd.prepare_lca_inputs({act: 1}, ipcc)
```

--------------------------------

### Getting Random Database Activity and ID (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

Similar to a previous snippet, this retrieves a random activity but also explicitly accesses and displays its internal Brightway2 database ID.

```python
act = bd.Database("Exiobase 3.8.1 Monetary 2015").random()
act, act.id
```

--------------------------------

### Setting Brightway2 Current Project (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This command sets the currently active Brightway2 project. Subsequent operations will be performed within this project context.

```python
bd.projects.set_current("EXIOBASE 3.8.1 2015")
```

--------------------------------

### Getting Random Database Activity (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This code retrieves a random activity object from the specified Brightway2 database. This is often used for testing or exploring database contents.

```python
act = bd.Database("Exiobase 3.8.1 Monetary 2015").random()
act
```

--------------------------------

### Writing Importer Database (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This method writes the processed Exiobase data, after applying strategies, into a new Brightway2 database with the specified name.

```python
ex.write_database()
```

--------------------------------

### Applying Importer Strategies (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This method applies a set of predefined strategies to the imported Exiobase data. Strategies handle data cleaning, linking, and other processing steps before writing to the database.

```python
ex.apply_strategies()
```

--------------------------------

### Importing Brightway2 Libraries (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This snippet imports the necessary Brightway2 modules and the specific Exiobase monetary importer class, along with the pathlib module for path handling.

```python
import bw2data as bd 
import bw2io as bi
import bw2calc as bc
from bw2io.importers.exiobase3_monetary import Exiobase3MonetaryImporter
from pathlib import Path
```

--------------------------------

### Deleting Brightway2 Project (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This command deletes a Brightway2 project by its name. The second argument `True` confirms the deletion without prompting.

```python
bd.projects.delete_project("EXIOBASE 3.8.1 2015", True)
```

--------------------------------

### Accessing LCA Technosphere Matrix (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This accesses the technosphere matrix used internally by the LCA object. This matrix represents the system model of production activities.

```python
lca.technosphere_matrix
```

--------------------------------

### Timing LCA Recalculation (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This uses the IPython/Jupyter `%timeit` magic command to measure the execution time of recalculating the LCIA for a specific activity ID with a demand of 1.

```python
%timeit lca.redo_lcia({12254: 1})
```

--------------------------------

### Running LCA Inventory and Impact Assessment (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

These methods execute the core LCA calculation steps: `lci()` calculates the life cycle inventory, and `lcia()` calculates the life cycle impact assessment scores based on the defined method.

```python
lca.lci()
lca.lcia()
```

--------------------------------

### Accessing LCA Impact Score (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This accesses the calculated total impact score from the completed LCA object. The score corresponds to the impact method defined during initialization.

```python
lca.score
```

--------------------------------

### Defining LCA Impact Method (Python)

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Exiobase 3.8 import.ipynb

This snippet defines a tuple representing a specific impact assessment method from the default Brightway2 methods database. The tuple structure identifies the method, category, and subcategory.

```python
ipcc = ('IPCC 2013', 'climate change', 'GWP 100a')
```

--------------------------------

### Importing Brightway2 Libraries - Python

Source: https://github.com/brightway-lca/brightway2-io/blob/main/dev/Untitled.ipynb

Imports the `bw2data` library for managing databases and core Brightway2 data structures, and the `bw2io` library for handling data input and output operations. These imports are fundamental prerequisites for most Brightway2 workflows.

```python
import bw2data as bd
import bw2io as bi
```

--------------------------------

### Importing and Processing Ecoinvent Database using brightway2-io in Python

Source: https://github.com/brightway-lca/brightway2-io/blob/main/README.rst

Demonstrates the typical workflow for using `brightway2-io` to import an ecoinvent database. It shows initializing the importer, applying standard processing strategies, checking for unlinked exchanges, and writing the processed data to the Brightway database.

```ipython
In [1]: import bw2io as bi

In [2]: import brightway2 as bw2

In [3]: bi.__version__
Out[3]: (0, 8, 7)

In [4]: bw2.__version__
Out[4]: (2, 4, 1)

In [5]: importer = bi.SingleOutputEcospold2Importer('path/to/ecoinvent/datasets/', 'ei_38_cutoff')
Extracting XML data from 19565 datasets
Extracted 19565 datasets in 19.21 seconds

In [6]: importer.apply_strategies()
Applying strategy: normalize_units
Applying strategy: update_ecoinvent_locations
Applying strategy: remove_zero_amount_coproducts
Applying strategy: remove_zero_amount_inputs_with_no_activity
Applying strategy: remove_unnamed_parameters
Applying strategy: es2_assign_only_product_with_amount_as_reference_product
Applying strategy: assign_single_product_as_activity
Applying strategy: create_composite_code
Applying strategy: drop_unspecified_subcategories
Applying strategy: fix_ecoinvent_flows_pre35
Applying strategy: drop_temporary_outdated_biosphere_flows
Applying strategy: link_biosphere_by_flow_uuid
Applying strategy: link_internal_technosphere_by_composite_code
Applying strategy: delete_exchanges_missing_activity
Applying strategy: delete_ghost_exchanges
Applying strategy: remove_uncertainty_from_negative_loss_exchanges
Applying strategy: fix_unreasonably_high_lognormal_uncertainties
Applying strategy: set_lognormal_loc_value
Applying strategy: convert_activity_parameters_to_list
Applying strategy: add_cpc_classification_from_single_reference_product
Applying strategy: delete_none_synonyms
Applied 21 strategies in 3.62 seconds

In [7]: importer.statistics()
19565 datasets
629959 exchanges
0 unlinked exchanges

Out[7]: (19565, 629959, 0)

In [8]: if importer.statistics()[2] == 0:
   ...:     importer.write_database()
   ...: else:
   ...:     print("There are unlinked exchanges.")
   ...:     importer.write_excel()
   ...:
19565 datasets
629959 exchanges
0 unlinked exchanges

Writing activities to SQLite3 database:
0% [##############################] 100% | ETA: 00:00:00
Total time elapsed: 00:02:29
Title: Writing activities to SQLite3 database:
Started: 11/07/2022 11:55:57
Finished: 11/07/2022 11:58:26
Total time elapsed: 00:02:29
CPU %: 32.90
Memory %: 11.17
Created database: ei_38_cutoff
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.