python: simplify module imports (#17507)

In #16624, I introduced a new mechanism to record imports to other
modules, instead of having specialized datetime/typing/pydantic objects
to manage imports for these modules.

This change reuses the mechanism from #16624 and replace the specialized
import managers by the generic one. Unused imports from various
.mustache templates are also cleaned up.

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api/auth_api.py

@@ -12,12 +12,9 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
-import io
 import warnings
-
 from pydantic import validate_call, Field, StrictFloat, StrictStr, StrictInt
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 try:
     from typing import Annotated

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api/body_api.py

@@ -12,24 +12,18 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
-import io
 import warnings
-
 from pydantic import validate_call, Field, StrictFloat, StrictStr, StrictInt
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 try:
     from typing import Annotated
 except ImportError:
     from typing_extensions import Annotated
 
-from pydantic import Field
-from typing_extensions import Annotated
-from pydantic import StrictBytes, StrictStr
-
+from pydantic import Field, StrictBytes, StrictStr
 from typing import Any, Dict, List, Optional, Union
-
+from typing_extensions import Annotated
 from openapi_client.models.pet import Pet
 from openapi_client.models.tag import Tag
 
@@ -519,7 +513,7 @@ class BodyApi:
         if body is not None:
             # convert to byte array if the input is a file name (str)
             if isinstance(body, str):
-                with io.open(body, "rb") as _fp:
+                with open(body, "rb") as _fp:
                     _body_params = _fp.read()
             else:
                 _body_params = body

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api/form_api.py

@@ -12,12 +12,9 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
-import io
 import warnings
-
 from pydantic import validate_call, Field, StrictFloat, StrictStr, StrictInt
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 try:
     from typing import Annotated
@@ -25,10 +22,8 @@ except ImportError:
     from typing_extensions import Annotated
 
 from pydantic import StrictBool, StrictInt, StrictStr
-
 from typing import Optional
 
-
 from openapi_client.api_client import ApiClient
 from openapi_client.api_response import ApiResponse
 from openapi_client.rest import RESTResponseType

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api/header_api.py

@@ -12,12 +12,9 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
-import io
 import warnings
-
 from pydantic import validate_call, Field, StrictFloat, StrictStr, StrictInt
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 try:
     from typing import Annotated
@@ -25,9 +22,7 @@ except ImportError:
     from typing_extensions import Annotated
 
 from pydantic import StrictBool, StrictInt, StrictStr, field_validator
-
 from typing import Optional
-
 from openapi_client.models.string_enum_ref import StringEnumRef
 
 from openapi_client.api_client import ApiClient

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api/path_api.py

@@ -12,12 +12,9 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
-import io
 import warnings
-
 from pydantic import validate_call, Field, StrictFloat, StrictStr, StrictInt
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 try:
     from typing import Annotated
@@ -25,7 +22,6 @@ except ImportError:
     from typing_extensions import Annotated
 
 from pydantic import StrictInt, StrictStr, field_validator
-
 from openapi_client.models.string_enum_ref import StringEnumRef
 
 from openapi_client.api_client import ApiClient

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/api/query_api.py

@@ -12,12 +12,9 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
-import io
 import warnings
-
 from pydantic import validate_call, Field, StrictFloat, StrictStr, StrictInt
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 try:
     from typing import Annotated
@@ -25,11 +22,8 @@ except ImportError:
     from typing_extensions import Annotated
 
 from datetime import date, datetime
-
 from pydantic import StrictBool, StrictInt, StrictStr, field_validator
-
 from typing import Any, Optional
-
 from openapi_client.models.pet import Pet
 from openapi_client.models.string_enum_ref import StringEnumRef
 from openapi_client.models.test_query_style_form_explode_true_array_string_query_object_parameter import TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter