Switch YAML parser to ruamel.yaml which uses YAML 1.2 (#1042)

fixes #1041 
ruamel.yaml understands yaml1.2 which yaml doesn't support.
yaml 1.2 lacks norway issue

---------

Co-authored-by: Dylan Anthony <dbanty@users.noreply.github.com>

Author: rtaycher

.changeset/switch_yaml_parsing_to_12.md

@@ -0,0 +1,11 @@
+---
+default: major
+---
+
+# Switch YAML parsing to 1.2
+
+This change switches the YAML parsing library to `ruamel.yaml` which follows the YAML 1.2 specification. 
+[There are breaking changes](https://yaml.readthedocs.io/en/latest/pyyaml/#defaulting-to-yaml-12-support) from YAML 1.1 to 1.2,
+though they will not affect most use cases.
+
+PR #1042 fixes #1041. Thanks @rtaycher!

openapi_python_client/__init__.py

@@ -11,8 +11,9 @@
 
 import httpcore
 import httpx
-import yaml
 from jinja2 import BaseLoader, ChoiceLoader, Environment, FileSystemLoader, PackageLoader
+from ruamel.yaml import YAML
+from ruamel.yaml.error import YAMLError
 
 from openapi_python_client import utils
 
@@ -350,8 +351,9 @@ def _load_yaml_or_json(data: bytes, content_type: Optional[str]) -> Union[Dict[s
             return GeneratorError(header=f"Invalid JSON from provided source: {err}")
     else:
         try:
-            return yaml.safe_load(data)
-        except yaml.YAMLError as err:
+            yaml = YAML(typ="safe")
+            return yaml.load(data)
+        except YAMLError as err:
             return GeneratorError(header=f"Invalid YAML from provided source: {err}")
 
 

openapi_python_client/config.py

@@ -4,9 +4,9 @@
 from pathlib import Path
 from typing import Dict, List, Optional, Union
 
-import yaml
 from attr import define
 from pydantic import BaseModel
+from ruamel.yaml import YAML
 
 
 class ClassOverride(BaseModel):
@@ -51,7 +51,8 @@ def load_from_path(path: Path) -> "ConfigFile":
         if mime == "application/json":
             config_data = json.loads(path.read_text())
         else:
-            config_data = yaml.safe_load(path.read_text())
+            yaml = YAML(typ="safe")
+            config_data = yaml.load(path)
         config = ConfigFile(**config_data)
         return config