Harrison/json new line (#4646)

Co-authored-by: David Chen <davidchen@gliacloud.com>

langchain/output_parsers/pydantic.py

@@ -22,7 +22,7 @@ class PydanticOutputParser(BaseOutputParser[T]):
             json_str = ""
             if match:
                 json_str = match.group()
-            json_object = json.loads(json_str)
+            json_object = json.loads(json_str, strict=False)
             return self.pydantic_object.parse_obj(json_object)
 
         except (json.JSONDecodeError, ValidationError) as e:

tests/unit_tests/output_parsers/test_pydantic_parser.py

@@ -21,6 +21,7 @@ class TestModel(BaseModel):
     additional_fields: Optional[str] = Field(
         description="Additional fields", default=None
     )
+    for_new_lines: str = Field(description="To be used to test newlines")
 
 
 # Prevent pytest from trying to run tests on TestModel
@@ -30,7 +31,8 @@ TestModel.__test__ = False  # type: ignore[attr-defined]
 DEF_RESULT = """{
     "action": "Update",
     "action_input": "The PydanticOutputParser class is powerful",
-    "additional_fields": null
+    "additional_fields": null,
+    "for_new_lines": "not_escape_newline:\n escape_newline: \\n"
 }"""
 
 # action 'update' with a lowercase 'u' to test schema validation failure.
@@ -44,6 +46,7 @@ DEF_EXPECTED_RESULT = TestModel(
     action=Actions.UPDATE,
     action_input="The PydanticOutputParser class is powerful",
     additional_fields=None,
+    for_new_lines="not_escape_newline:\n escape_newline: \n",
 )