diff --git a/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache b/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache
index 7c7bfcdc7d5..000b6658b13 100644
--- a/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache
@@ -592,7 +592,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/modules/openapi-generator/src/main/resources/python/api_client.mustache b/modules/openapi-generator/src/main/resources/python/api_client.mustache
index 83b21860d55..758b0b76b10 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -507,7 +507,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
index 262f9aecfa7..8987e22ac91 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
@@ -500,7 +500,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py b/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py
index 6383d7e39e7..6d0d11c5b53 100644
--- a/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py
+++ b/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py
@@ -554,7 +554,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/client/echo_api/python/openapi_client/api_client.py b/samples/client/echo_api/python/openapi_client/api_client.py
index 262f9aecfa7..8987e22ac91 100644
--- a/samples/client/echo_api/python/openapi_client/api_client.py
+++ b/samples/client/echo_api/python/openapi_client/api_client.py
@@ -500,7 +500,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
index fdb8c16ab6b..8111939439d 100644
--- a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
@@ -502,7 +502,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py b/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py
index 9fefc1b1ae0..52390c675df 100644
--- a/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py
@@ -524,7 +524,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/openapi3/client/petstore/python-pydantic-v1/petstore_api/api_client.py b/samples/openapi3/client/petstore/python-pydantic-v1/petstore_api/api_client.py
index 1b4f238f9dd..fae62ad7576 100644
--- a/samples/openapi3/client/petstore/python-pydantic-v1/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python-pydantic-v1/petstore_api/api_client.py
@@ -553,7 +553,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.
diff --git a/samples/openapi3/client/petstore/python/petstore_api/api_client.py b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
index f9ebfbb5402..3e20bad1ecc 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
@@ -499,7 +499,7 @@ class ApiClient:
             else:
                 new_params.append((k, quote(str(v))))
 
-        return "&".join(["=".join(item) for item in new_params])
+        return "&".join(["=".join(map(str, item)) for item in new_params])
 
     def files_parameters(self, files=None):
         """Builds form parameters.