Fix compatibility with python 3.8 and 3.9

bw2io/ecoinvent.py

@@ -3,7 +3,7 @@
 import zipfile
 from collections import defaultdict
 from pathlib import Path
-from typing import Any
+from typing import Any, Optional, List
 
 import bw2data as bd
 import ecoinvent_interface as ei
@@ -23,7 +23,7 @@
     USE_MP = True
 
 
-def get_excel_sheet_names(file_path: Path) -> list[str]:
+def get_excel_sheet_names(file_path: Path) -> List[str]:
     """Read XML metadata file instead of using openpyxl, which loads the whole workbook.
 
     From https://stackoverflow.com/questions/12250024/how-to-obtain-sheet-names-from-xls-files-without-loading-the-whole-file.
@@ -36,7 +36,7 @@ def get_excel_sheet_names(file_path: Path) -> list[str]:
     return sheets
 
 
-def header_dict(array: list) -> list[dict]:
+def header_dict(array: list) -> List[dict]:
     return [
         {header.lower(): value for header, value in zip(array[0], row)}
         for row in array[1:]
@@ -62,11 +62,11 @@ def pick_a_unit_label_already(obj: dict) -> str:
 def import_ecoinvent_release(
     version: str,
     system_model: str,
-    username: str | None = None,
-    password: str | None = None,
+    username: Optional[str] = None,
+    password: Optional[str] = None,
     lci: bool = True,
     lcia: bool = True,
-    biosphere_name: str | None = None,
+    biosphere_name: Optional[str] = None,
     biosphere_write_mode: str = "patch",
     importer_signal: Any = None,
     use_mp: bool = USE_MP,

bw2io/importers/ecoinvent_lcia.py

@@ -1,6 +1,7 @@
 import functools
 import warnings
 from numbers import Number
+from typing import Optional
 
 from bw2data import Database, config
 
@@ -22,7 +23,7 @@ class EcoinventLCIAImporter(LCIAImporter):
 
     """
 
-    def __init__(self, biosphere_database: str | None = None):
+    def __init__(self, biosphere_database: Optional[str] = None):
         """Initialize an instance of EcoinventLCIAImporter.
 
         Defines strategies in ``__init__`` because ``config.biosphere`` is dynamic.

bw2io/importers/ecospold2.py

@@ -1,7 +1,7 @@
 from functools import partial
 from pathlib import Path
 from time import time
-from typing import Any
+from typing import Any, Optional
 import os
 
 from bw2data import Database, config
@@ -60,7 +60,7 @@ def __init__(
         self,
         dirpath: str,
         db_name: str,
-        biosphere_database_name: str | None = None,
+        biosphere_database_name: Optional[str] = None,
         extractor: Any=Ecospold2DataExtractor,
         use_mp: bool=USE_MP,
         signal: Any=None,
@@ -76,7 +76,7 @@ def __init__(
             Path to the directory containing the ecospold2 file.
         db_name : str
             Name of the LCI database.
-        biosphere_database_name : str | None
+        biosphere_database_name : Union[str, None]
             Name of biosphere database to link to. Uses `config.biosphere` if not provided.
         extractor : class
             Class for extracting data from the ecospold2 file, by default Ecospold2DataExtractor.

bw2io/importers/ecospold2_biosphere.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+from typing import Optional
 
 from lxml import objectify
 
@@ -44,7 +45,7 @@ def __init__(
         self,
         name: str = "biosphere3",
         version: str = "3.9",
-        filepath: Path | None = None,
+        filepath: Optional[Path] = None,
     ):
         """
         Initialize the importer.
@@ -64,7 +65,7 @@ def __init__(
             ensure_categories_are_tuples,
         ]
 
-    def extract(self, version: str | None, filepath: Path | None):
+    def extract(self, version: Optional[str], filepath: Optional[Path]) :
         """
         Extract elementary flows from the xml file.
 

bw2io/strategies/ecospold2.py

@@ -1,5 +1,6 @@
 import math
 import warnings
+from typing import List, Dict
 
 from bw2data import Database
 from bw2data.logs import close_log, get_io_logger
@@ -9,7 +10,7 @@
 from .migrations import migrate_exchanges, migrations
 
 
-def link_biosphere_by_flow_uuid(db: list[dict], biosphere: str="biosphere3"):
+def link_biosphere_by_flow_uuid(db: List[Dict], biosphere: str="biosphere3"):
     """
     Link the exchanges in the given list of datasets to the specified
     biosphere database by flow UUID.

setup.py

@@ -37,6 +37,7 @@
     author="Chris Mutel",
     author_email="[email protected]",
     license="BSD 3-clause",
+    python_requires='>=3.8',
     install_requires=REQUIREMENTS,
     url="https://github.com/brightway-lca/brightway2-io",
     long_description=open("README.rst").read(),
@@ -51,7 +52,6 @@
         "Operating System :: Microsoft :: Windows",
         "Operating System :: POSIX",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Topic :: Scientific/Engineering :: Information Analysis",
         "Topic :: Scientific/Engineering :: Mathematics",