[mgmt]Update setup.py template for python3 only (Azure#22235)

* Update setup.py

* Update swagger_to_sdk_config_autorest.json

* Update README.md

* Delete setup.cfg

* Update setup.py

Author: msyyc

swagger_to_sdk_config_autorest.json

@@ -7,7 +7,8 @@
       "python-mode": "update",
       "sdkrel:python-sdks-folder": "./sdk/.",
       "multiapi": "",
-      "track2": ""
+      "track2": "",
+      "python3-only": ""
     },
     "advanced_options": {
       "create_sdk_pull_requests": true,

tools/azure-sdk-tools/packaging_tools/templates/README.md

@@ -1,9 +1,12 @@
 # Microsoft Azure SDK for Python
 
 This is the Microsoft Azure {{package_pprint_name}} Client Library.
-This package has been tested with Python 2.7, 3.6+.
+This package has been tested with Python 3.7+.
 For a more complete view of Azure libraries, see the [azure sdk python release](https://aka.ms/azsdk/python/all).
 
+## _Disclaimer_
+
+_Azure SDK Python packages support for Python 2.7 has ended 01 January 2022. For more information and questions, please refer to https://github.com/Azure/azure-sdk-for-python/issues/20691_
 
 # Usage
 

tools/azure-sdk-tools/packaging_tools/templates/setup.cfg

@@ -20,21 +20,6 @@
 # a-b-c => a.b.c
 namespace_name = PACKAGE_NAME.replace('-', '.')
 
-# azure v0.x is not compatible with this package
-# azure v0.x used to have a __version__ attribute (newer versions don't)
-try:
-    import azure
-    try:
-        ver = azure.__version__
-        raise Exception(
-            'This package is incompatible with azure=={}. '.format(ver) +
-            'Uninstall it with "pip uninstall azure".'
-        )
-    except AttributeError:
-        pass
-except ImportError:
-    pass
-
 # Version extraction inspired from 'requests'
 with open(os.path.join(package_folder_path, 'version.py')
           if os.path.exists(os.path.join(package_folder_path, 'version.py'))
@@ -63,10 +48,8 @@
     classifiers=[
         '{{classifier}}',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
+        "Programming Language :: Python :: 3 :: Only",
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
@@ -91,10 +74,8 @@
         'azure-core>=1.6.0,<2.0.0',
         {%- endif %}
         {%- if need_azuremgmtcore %}
-        'azure-mgmt-core>=1.2.0,<2.0.0',
+        'azure-mgmt-core>=1.3.0,<2.0.0',
         {%- endif %}
     ],
-    extras_require={
-        ":python_version<'3.0'": ['{{package_nspkg}}'],
-    }
+    python_requires=">=3.7"
 )