fix: python3.7 typing fix

Author: owlas

README.md

@@ -52,11 +52,17 @@ dbt2looker
 
 Requires [poetry](https://python-poetry.org/docs/) and python >=3.7
 
+For development, it is recommended to use python 3.7:
+
 ```
-# Install
+# Ensure you're using 3.7
+poetry env use 3.7  
+# alternative: poetry env use /usr/local/opt/[email protected]/bin/python3
+
+# Install dependencies and main package
 poetry install
 
-# Run
+# Run dbtlooker in poetry environment
 poetry run dbt2looker
 ```
 

dbt2looker/models.py

@@ -1,5 +1,9 @@
 from enum import Enum
-from typing import Union, Dict, List, Literal, Optional
+from typing import Union, Dict, List, Optional
+try:
+    from typing import Literal
+except ImportError:
+    from typing_extensions import Literal
 from pydantic import BaseModel, Field, PydanticValueError, validator
 
 

poetry.lock

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "dbt2looker"
-version = "0.7.0"
+version = "0.7.1"
 description = "Generate lookml view files from dbt models"
 authors = ["oliverlaslett <[email protected]>"]
 license = "MIT"
@@ -14,6 +14,7 @@ lkml = "^1.1.0"
 pydantic = "^1.8.1"
 PyYAML = "^5.4.1"
 jsonschema = "^3.2.0"
+typing-extensions = "^3.10.0"
 
 [tool.poetry.dev-dependencies]