fix flake8 linting errors

ensysmod/api/endpoints/energy_models.py

@@ -154,6 +154,8 @@ def myopic_optimize_model(model_id: int,
     esM = generate_esm_from_model(db=db, model=energy_model)
     zipped_result_file_path = myopic_optimize_esm(esM=esM, optimization_parameters=energy_model_optimization_parameters)
 
-    return FileResponse(zipped_result_file_path,
-                        media_type="application/zip",
-                        filename=f"{energy_model.name} {energy_model_optimization_parameters.start_year}-{energy_model_optimization_parameters.end_year}.zip")
+    return FileResponse(
+        zipped_result_file_path,
+        media_type="application/zip",
+        filename=f"{energy_model.name} {energy_model_optimization_parameters.start_year}-{energy_model_optimization_parameters.end_year}.zip"
+    )

ensysmod/crud/energy_model.py

@@ -1,6 +1,6 @@
 from typing import Optional
 
-from sqlalchemy import delete, select
+from sqlalchemy import delete
 from sqlalchemy.orm import Session
 
 from ensysmod import crud

ensysmod/crud/energy_model_override.py

@@ -6,7 +6,7 @@
 
 
 class CRUDEnergyModelOverride(CRUDBaseDependsComponentRegion[EnergyModelOverride, EnergyModelOverrideCreate,
-                                                              EnergyModelOverrideUpdate]):
+                                                             EnergyModelOverrideUpdate]):
     """
     CRUD operations for EnergyModelOverride
     """

ensysmod/schemas/energy_model_optimization.py

@@ -13,8 +13,12 @@ class EnergyModelOptimizationBase(BaseModel):
     end_year: Optional[int] = Field(None, description="Year of the last optimization", example="2050")
     number_of_steps: Optional[int] = Field(None, description="Number of optimization runs excluding the start year", example="3")
     years_per_step: Optional[int] = Field(None, description="Number of years represented by one optimization run", example="10")
-    CO2_reference: Optional[float] = Field(None, description="CO2 emission reference value to which the reduction should be applied to", example="366")
-    CO2_reduction_targets: Optional[List[float]] = Field(None, description="CO2 reduction targets for all optimization periods, in percentages. If specified, the length of the list must equal the number of optimization steps, and a sink component named 'CO2 to environment' is required.", example="[0, 25, 50, 100]")
+    CO2_reference: Optional[float] = Field(None,
+                                           description="CO2 emission reference value to which the reduction should be applied to",
+                                           example="366")
+    CO2_reduction_targets: Optional[List[float]] = Field(None,
+                                                         description="CO2 reduction targets for all optimization periods, in percentages. If specified, the length of the list must equal the number of optimization steps, and a sink component named 'CO2 to environment' is required.",
+                                                         example="[0, 25, 50, 100]")
 
     # validators
     _valid_optimization_timeframe = root_validator(allow_reuse=True)(validators.validate_optimization_timeframe)