Merge bitcoin/bitcoin#28213: scripted-diff: Specify Python major version explicitly on Windows

6a7686b446 scripted-diff: Specify Python major version explicitly on Windows (Hennadii Stepanov)

Pull request description:

  On Windows, it is the accepted practice to use `py.exe` launcher:
  - https://learn.microsoft.com/en-us/windows/python/faqs#what-is-py-exe-
  - https://docs.python.org/3/using/windows.html#python-launcher-for-windows

  One of its features is the correct handling of shebang lines like the one we use: `#!/usr/bin/env python3`.

  However, Windows OS app execution aliases might [interfere](https://learn.microsoft.com/en-us/windows/python/faqs#why-does-running-python-exe-open-the-microsoft-store-) with the launcher's behaviour. Such aliases are enabled on Windows 11 by default:

  ![image](https://github.com/bitcoin/bitcoin/assets/32963518/407837ec-e89a-4bc1-98b1-db983002065a)

  For example, on a fresh Windows 11 Pro installation with the Python installed from the [Chocolatey](https://community.chocolatey.org/packages/python/3.11.4) package manager, one will get the following error:
  ```
  >py -3 test\functional\rpc_signer.py
  2023-08-03T19:41:13.353000Z TestFramework (INFO): PRNG seed is: 2694758731106548661
  2023-08-03T19:41:13.353000Z TestFramework (INFO): Initializing test directory C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3
  2023-08-03T19:41:14.538000Z TestFramework (ERROR): Assertion failed
  Traceback (most recent call last):
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\util.py", line 140, in try_rpc
      fun(*args, **kwds)
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\coverage.py", line 50, in __call__
      return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\authproxy.py", line 129, in __call__
      raise JSONRPCException(response['error'], status)
  test_framework.authproxy.JSONRPCException: RunCommandParseJSON error: process(py C:\Users\hebasto\bitcoin\test\functional\mocks\signer.py enumerate) returned 9009: Python was not found; run without arguments to install from the Microsoft Store, or disable this shortcut from Settings > Manage App Execution Aliases.
   (-1)

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\test_framework.py", line 131, in main
      self.run_test()
    File "C:\Users\hebasto\bitcoin\test\functional\rpc_signer.py", line 72, in run_test
      assert_raises_rpc_error(-1, 'fingerprint not found',
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\util.py", line 131, in assert_raises_rpc_error
      assert try_rpc(code, message, fun, *args, **kwds), "No exception raised"
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\util.py", line 146, in try_rpc
      raise AssertionError(
  AssertionError: Expected substring not found in error message:
  substring: 'fingerprint not found'
  error message: 'RunCommandParseJSON error: process(py C:\Users\hebasto\bitcoin\test\functional\mocks\signer.py enumerate) returned 9009: Python was not found; run without arguments to install from the Microsoft Store, or disable this shortcut from Settings > Manage App Execution Aliases.
  '.
  2023-08-03T19:41:14.592000Z TestFramework (INFO): Stopping nodes
  2023-08-03T19:41:14.799000Z TestFramework (WARNING): Not cleaning up dir C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): Test failed. Test logging available at C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3/test_framework.log
  2023-08-03T19:41:14.799000Z TestFramework (ERROR):
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): Hint: Call C:\Users\hebasto\bitcoin\test\functional\combine_logs.py 'C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3' to consolidate all logs
  2023-08-03T19:41:14.799000Z TestFramework (ERROR):
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): If this failure happened unexpectedly or intermittently, please file a bug and provide a link or upload of the combined log.
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): https://github.com/bitcoin/bitcoin/issues
  2023-08-03T19:41:14.799000Z TestFramework (ERROR):

  ```

  This PR resolves this issue by explicitly specifying the Python major version and makes testing of self-compiled binaries more straightforward.

ACKs for top commit:
  MarcoFalke:
    lgtm ACK 6a7686b446
  stickies-v:
    utACK 6a7686b446

Tree-SHA512: 5681141e222bc833c6250cb79fe3a1c8e02255eb2c86010bc0f8239afcdfed784ed7788c8579209d931bd357f58d5655cf33ffeb2f46b1879f37cdc30e7a7c91

test/functional/rpc_signer.py

@@ -21,7 +21,7 @@ class RPCSignerTest(BitcoinTestFramework):
     def mock_signer_path(self):
         path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mocks', 'signer.py')
         if platform.system() == "Windows":
-            return "py " + path
+            return "py -3 " + path
         else:
             return path
 

test/functional/wallet_signer.py

@@ -25,21 +25,21 @@ class WalletSignerTest(BitcoinTestFramework):
     def mock_signer_path(self):
         path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mocks', 'signer.py')
         if platform.system() == "Windows":
-            return "py " + path
+            return "py -3 " + path
         else:
             return path
 
     def mock_invalid_signer_path(self):
         path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mocks', 'invalid_signer.py')
         if platform.system() == "Windows":
-            return "py " + path
+            return "py -3 " + path
         else:
             return path
 
     def mock_multi_signers_path(self):
         path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'mocks', 'multi_signers.py')
         if platform.system() == "Windows":
-            return "py " + path
+            return "py -3 " + path
         else:
             return path