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 fe61bd61a5e..7c7bfcdc7d5 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
@@ -577,7 +577,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
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 8c9812db7d2..83b21860d55 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -491,7 +491,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api_client.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api_client.py
index ce93eaca6de..262f9aecfa7 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api_client.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api_client.py
@@ -484,7 +484,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
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 459e3850849..6383d7e39e7 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
@@ -539,7 +539,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/client/echo_api/python-pydantic-v1/test/test_manual.py b/samples/client/echo_api/python-pydantic-v1/test/test_manual.py
index fedf4cfad6b..202cf2dd196 100644
--- a/samples/client/echo_api/python-pydantic-v1/test/test_manual.py
+++ b/samples/client/echo_api/python-pydantic-v1/test/test_manual.py
@@ -149,6 +149,12 @@ class TestManual(unittest.TestCase):
         client = openapi_client.ApiClient()
         params = client.parameters_to_url_query([("boolean", True),], {})
         self.assertEqual(params, "boolean=true")
+    
+    def test_parameters_to_url_query_list_value(self):
+        client = openapi_client.ApiClient()
+        params = client.parameters_to_url_query(params=[('list', [1, 2, 3])], collection_formats={'list': 'multi'})
+        self.assertEqual(params, "list=1&list=2&list=3")
+
 
     def echoServerResponseParaserTest(self):
         s = """POST /echo/body/Pet/response_string HTTP/1.1
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 ce93eaca6de..262f9aecfa7 100644
--- a/samples/client/echo_api/python/openapi_client/api_client.py
+++ b/samples/client/echo_api/python/openapi_client/api_client.py
@@ -484,7 +484,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/client/echo_api/python/tests/test_manual.py b/samples/client/echo_api/python/tests/test_manual.py
index 17e0e101405..525c0875854 100644
--- a/samples/client/echo_api/python/tests/test_manual.py
+++ b/samples/client/echo_api/python/tests/test_manual.py
@@ -224,7 +224,12 @@ class TestManual(unittest.TestCase):
         client = openapi_client.ApiClient()
         params = client.parameters_to_url_query([("boolean", True),], {})
         self.assertEqual(params, "boolean=true")
-
+    
+    def test_parameters_to_url_query_list_value(self):
+        client = openapi_client.ApiClient()
+        params = client.parameters_to_url_query(params=[('list', [1, 2, 3])], collection_formats={'list': 'multi'})
+        self.assertEqual(params, "list=1&list=2&list=3")
+    
     def echoServerResponseParaserTest(self):
         s = """POST /echo/body/Pet/response_string HTTP/1.1
 Host: localhost:3000
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 5e403f5a51a..fdb8c16ab6b 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
@@ -486,7 +486,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
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 dbef903bdd6..9fefc1b1ae0 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
@@ -509,7 +509,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
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 2a74a7d7004..1b4f238f9dd 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
@@ -538,7 +538,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/openapi3/client/petstore/python-pydantic-v1/tests/test_api_client.py b/samples/openapi3/client/petstore/python-pydantic-v1/tests/test_api_client.py
index d254d28010d..9205f4ed998 100644
--- a/samples/openapi3/client/petstore/python-pydantic-v1/tests/test_api_client.py
+++ b/samples/openapi3/client/petstore/python-pydantic-v1/tests/test_api_client.py
@@ -260,3 +260,7 @@ class ApiClientTests(unittest.TestCase):
     def test_parameters_to_url_query_boolean_value(self):
         result = self.api_client.parameters_to_url_query([('boolean', True)], {})
         self.assertEqual(result, "boolean=true")
+
+    def test_parameters_to_url_query_list_value(self):
+        params = self.api_client.parameters_to_url_query(params=[('list', [1, 2, 3])], collection_formats={'list': 'multi'})
+        self.assertEqual(params, "list=1&list=2&list=3")
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 5aca14639f2..f9ebfbb5402 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
@@ -483,7 +483,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, str(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/openapi3/client/petstore/python/tests/test_api_client.py b/samples/openapi3/client/petstore/python/tests/test_api_client.py
index 972b705872d..8c5a99d3acf 100644
--- a/samples/openapi3/client/petstore/python/tests/test_api_client.py
+++ b/samples/openapi3/client/petstore/python/tests/test_api_client.py
@@ -245,3 +245,7 @@ class ApiClientTests(unittest.TestCase):
     def test_parameters_to_url_query_boolean_value(self):
         result = self.api_client.parameters_to_url_query([('boolean', True)], {})
         self.assertEqual(result, "boolean=true")
+
+    def test_parameters_to_url_query_list_value(self):
+        params = self.api_client.parameters_to_url_query(params=[('list', [1, 2, 3])], collection_formats={'list': 'multi'})
+        self.assertEqual(params, "list=1&list=2&list=3")