Throw if stream=True (#404)

* Throw if stream=True

* Fix types

src/cohere/client.py

@@ -6,6 +6,23 @@
 from .environment import CohereEnvironment
 
 
+def validate_args(obj: typing.Any, method_name: str, check_fn: typing.Callable[[typing.Any], typing.Any]) -> None:
+    method = getattr(obj, method_name)
+
+    def wrapped(*args: typing.Any, **kwargs: typing.Any) -> typing.Any:
+        check_fn(*args, **kwargs)
+        return method(*args, **kwargs)
+
+    setattr(obj, method_name, wrapped)
+
+
+def throw_if_stream_is_true(*args, **kwargs) -> None:
+    if kwargs.get("stream") is True:
+        raise ValueError(
+            "Since python sdk cohere==5.0.0, you must now use chat_stream(...) instead of chat(stream=True, ...)"
+        )
+
+
 class Client(BaseCohere):
     def __init__(
             self,
@@ -27,6 +44,8 @@ def __init__(
             httpx_client=httpx_client,
         )
 
+        validate_args(self, "chat", throw_if_stream_is_true)
+
 
 class AsyncClient(AsyncBaseCohere):
     def __init__(
@@ -48,3 +67,5 @@ def __init__(
             timeout=timeout,
             httpx_client=httpx_client,
         )
+
+        validate_args(self, "chat", throw_if_stream_is_true)

tests/test_client.py

@@ -28,6 +28,13 @@ def test_chat(self) -> None:
 
         print(chat)
 
+    def test_stream_equals_true(self) -> None:
+        with self.assertRaises(ValueError):
+            co.chat(
+                stream=True, # type: ignore
+                message="What year was he born?",
+            )
+
     def test_generate(self) -> None:
         response = co.generate(
             prompt='Please explain to me how LLMs work',