Use List[] instead of list[] for py3.8 compliance

nomenclature/core.py

@@ -1,5 +1,5 @@
 import logging
-from typing import Optional, Union
+from typing import Optional, Union, List
 
 import pyam
 from pydantic import validate_arguments
@@ -15,7 +15,7 @@ def process(
     df: pyam.IamDataFrame,
     dsd: DataStructureDefinition,
     dimensions: Optional[list[str]] = None,
-    processor: Optional[Union[Processor, list[Processor]]] = None,
+    processor: Optional[Union[Processor, List[Processor]]] = None,
 ) -> pyam.IamDataFrame:
     """Function for validation and region aggregation in one step
 

nomenclature/processor/required_data.py

@@ -1,6 +1,6 @@
 import logging
 from pathlib import Path
-from typing import Any, Optional, Union
+from typing import Any, Optional, Union, List
 
 import pydantic
 import yaml
@@ -19,12 +19,12 @@
 class RequiredMeasurand(BaseModel):
 
     variable: str
-    unit: Optional[Union[str, list[str]]] = Field(...)
+    unit: Optional[Union[str, List[str]]] = Field(...)
 
 
 class RequiredData(BaseModel):
 
-    measurand: list[RequiredMeasurand]
+    measurand: List[RequiredMeasurand]
     region: Optional[list[str]]
     year: Optional[list[int]]
 
@@ -63,11 +63,11 @@ def validate_with_definition(self, dsd: DataStructureDefinition) -> None:
             raise ValueError(error_msg)
 
     @property
-    def variable(self) -> list[str]:
+    def variable(self) -> List[str]:
         return [m.variable for m in self.measurand]
 
     @property
-    def pyam_required_data_list(self) -> list[dict]:
+    def pyam_required_data_list(self) -> List[dict]:
 
         return [
             {
@@ -81,8 +81,8 @@ def pyam_required_data_list(self) -> list[dict]:
 
     def _wrong_unit_variables(
         self, dsd: DataStructureDefinition
-    ) -> list[tuple[str, str, str]]:
-        wrong_units: list[tuple[str, Any, Any]] = []
+    ) -> List[tuple[str, str, str]]:
+        wrong_units: List[tuple[str, Any, Any]] = []
         if hasattr(dsd, "variable"):
             wrong_units.extend(
                 (m.variable, m.unit, dsd.variable[m.variable].unit)
@@ -97,7 +97,7 @@ def _wrong_unit_variables(
 class RequiredDataValidator(Processor):
 
     name: str
-    required_data: list[RequiredData]
+    required_data: List[RequiredData]
     file: Path
 
     @classmethod