VerifyDatabase

The VerifyDatabase module contains functionality for verifying an edited T-reX database within a given project in Brightway2. It performs this verification by calculating LCA scores for random activities within the specified database using selected methods.

Function Summary

• `VerifyDatabase`: This function verifies a database within a Brightway2 project by calculating LCA scores for random activities using Waste Footprint and Material Demand Footprint methods. Since it is not expected that every activity and method combination would result in a non-zero score, the function allows users to specify the number of activities and methods to be used in the verification process. The function also allows users to specify whether they want to check the Waste Footprint, Material Demand Footprint, or both.

  def VerifyDatabase(project_name, database_name, check_material=True, check_waste=True, log=True):
      # ... snippet to show verification process ... #
  
      print(f"\n** Verifying database {database_name} in project {project_name} **\n")
  
      # Loop until a non-zero score is obtained
      while lca_score == 0 and count < 5:
          try:
              count += 1
              # Get a random activity from the database
              act = bd.Database(database_name).random()
  
              # Initialize the list of methods
              methods = []
  
              # Find methods related to Waste Footprint
              if check_waste:
                  methods_waste = [x for x in bd.methods if "Waste" in x[1]]
                  methods += methods_waste
  
              # Find methods related to Material Demand Footprint
              if check_material:
                  methods_material = [x for x in bd.methods if "Demand" in x[1]]
                  methods += methods_material
  
              if not check_waste and not check_material:
                  method = bd.methods.random()
                  methods.append(method)
  
              # Choose a random method
              method = choice(methods)
  
              # Perform LCA calculation
              lca = bc.LCA({act: 1}, method)
              lca.lci()
              lca.lcia()
  
              # Get the lca score
              lca_score = lca.score
  
              # Print the result
              log_statement = f"\tScore: {lca_score:2.2e} \n\tMethod: {method[2]} \n\tActivity: {act['name']} \n\tDatabase: {database_name}\n"
  
          except Exception as e:
              # Print any errors that occur
              log_statement = (
                  f"@@@@@@@@  Error occurred with '{database_name}': {e}! @@@@@@@@"
              )
  
      # ...  end snippet ... #
  

Usage

This function is called automatically after each database is processed, and again after all databases have been processed. The function can also be called manually by the user by invoking the following command:

T-reX.VerifyDatabase(project_name, database_name, check_material=True, check_waste=True, log=True)