don't hardcode to first client in samples

.chronus/changes/python-multiClientSampleFix-2025-6-28-14-39-15.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+Don't hardcode client in sample to first client in list

packages/http-client-python/generator/pygen/codegen/serializers/sample_serializer.py

@@ -69,7 +69,7 @@ def _imports(self) -> FileImportSerializer:
     def _client_params(self) -> Dict[str, Any]:
         # client params
         special_param = {}
-        credential_type = getattr(self.code_model.clients[0].credential, "type", None)
+        credential_type = getattr(self.operation_group.client.credential, "type", None)
         if isinstance(credential_type, TokenCredentialType):
             special_param.update({"credential": "DefaultAzureCredential()"})
         elif isinstance(credential_type, KeyCredentialType):
@@ -78,7 +78,7 @@ def _client_params(self) -> Dict[str, Any]:
         params = [
             p
             for p in (
-                self.code_model.clients[0].parameters.positional + self.code_model.clients[0].parameters.keyword_only
+                self.operation_group.client.parameters.positional + self.operation_group.client.parameters.keyword_only
             )
             if not p.optional and p.client_default_value is None
         ]
@@ -153,6 +153,7 @@ def serialize(self) -> str:
         operation_result, return_var = self._operation_result()
         return self.env.get_template("sample.py.jinja2").render(
             code_model=self.code_model,
+            client=self.operation_group.client,
             file_name=self.file_name,
             operation_result=operation_result,
             operation_params=self._operation_params(),

packages/http-client-python/generator/pygen/codegen/templates/sample.py.jinja2

@@ -27,7 +27,7 @@
     {% endif %}
 """
 def main():
-    client = {{ code_model.clients[0].name }}(
+    client = {{ client.name }}(
         {% for key,value in client_params.items() %}
         {{ key }}={{ value }},
         {% endfor %}