[python] fix typing for API responses (#16802)

* [python] remove _preload_content

Signed-off-by: ふぁ <yuki@yuki0311.com>

* [python] remove _return_http_data_only

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* [python] remove async_req

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* [python] fix typing for API responses

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* [python] update samples

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* [python] fix AttributeError

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* [python] remove _preload_content

Signed-off-by: ふぁ <yuki@yuki0311.com>

* [python] fix response_type

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* [python] fix typo

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* [python] update simplify RESTClientObject

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* [python] update split call_api into 4 functions

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* [python] update samples

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* [python] update improve stream

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* [python] remove kwargs

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* [python] update ApiResponse

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* [python] add method for each return value

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* [python] update test

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* [python] update samples

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* [python] update docs

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* [python] add constantParams

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* [python] fix ImportError

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* [python] fix SyntaxError in RESTResponse

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* [python] add ApiResponse model_config

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* [python] fix when isBinary is str

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* [python] update type

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* [python] update samples

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* [python] add rest with pydantic v1

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* [python] update format

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* [python] update format and type

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* [python] add test

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* [python] update type to pydantic strict type

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* [python] remove leftover files

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* [python] remove descriptions per field

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* [python] add test

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* [python] fix test

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* [python] fix test

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* [python] remove multiprocessing

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* [python] update samples

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* [python] add blank line to docstring

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* [python] update docstring

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* [python] remove unwanted imports in rest

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---------

Signed-off-by: ふぁ <yuki@yuki0311.com>

samples/client/echo_api/python/openapi_client/configuration.py

@@ -15,7 +15,6 @@
 
 import copy
 import logging
-import multiprocessing
 import sys
 import urllib3
 
@@ -165,13 +164,6 @@ conf = openapi_client.Configuration(
            Set this to the SNI value expected by the server.
         """
 
-        self.connection_pool_maxsize = multiprocessing.cpu_count() * 5
-        """urllib3 connection pool's maximum number of connections saved
-           per pool. urllib3 uses 1 connection as default value, but this is
-           not the best value when you are making a lot of possibly parallel
-           requests to the same host, which is often the case here.
-           cpu_count * 5 is used as default value to increase performance.
-        """
 
         self.proxy = None
         """Proxy URL