THRIFT-5537: Drop support for end-of-life python versions (including python 2)

[greggdonovan]

• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?

• Did you squash your changes to a single commit? (not required, but preferred)
  Not yet - but will do after review. It's a large PR so I left separate commits to make it a bit easier to grok.

• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?

[greggdonovan]

@greptile

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Greptile Overview

Greptile Summary

This PR successfully removes Python 2 support and modernizes the Thrift Python library to require Python 3.10+. The changes span 93 files with comprehensive updates across build configuration, code generation, runtime library, and tests.

Key Changes:

• Updated minimum Python version to 3.10+ in setup.py, configure.ac, and documentation
• Removed deprecated generator options (py:old_style, py:new_style, py:utf8strings, py:enum) - all now default behavior
• Enforced IntEnum for all generated enum types with graceful unknown value handling
• Added comprehensive type hints to generated code and created py.typed marker for PEP 561
• Simplified SSL/TLS implementation: enforced TLS 1.2+ minimum, removed legacy Python 2.6/2.7 compatibility code
• Removed backports.ssl_match_hostname dependency - now using native OpenSSL hostname verification
• Cleaned up C extension module to remove Python 2 C API code (PyInt_AsLong → PyLong_AsLong, etc.)
• Unified build system: removed separate py3 build target, consolidated all Python testing under py
• Added comprehensive type checking tests using Astral's ty type checker
• Fixed test stability issues (server shutdown sequences, timeouts, socket cleanup)
• Removed 280+ known test failures that were specific to the now-removed py3 target

Testing & Quality:

• Added new test files: test_type_check.py, test_sslcontext_hostname.py, type_check_test.thrift
• Enhanced SSL tests with TLS version validation, deprecated protocol rejection, and expired certificate tests
• Improved server test cleanup to prevent resource leaks
• Multiple commits show iterative refinement and test stabilization

Breaking Changes:
This is explicitly a breaking change (THRIFT-5537) that drops support for Python < 3.10. Users on older Python versions must remain on previous Thrift releases.

Confidence Score: 5/5

• This PR is safe to merge - it's a well-executed modernization with comprehensive test coverage
• The changes are systematic and thorough across all affected areas. The PR includes 47 commits showing iterative development and test fixes. New type checking infrastructure validates generated code quality. Test failures were resolved through multiple refinement commits. The scope is appropriate for dropping Python 2 support.
• No files require special attention - the changes are consistent and well-tested

Important Files Changed

Filename	Overview
lib/py/setup.py	Updated Python version requirements to 3.10+, removed Python 2 backport dependencies
configure.ac	Removed py3 separate build target, unified on Python 3.10+ requirement
lib/py/src/transport/TSSLSocket.py	Enforced TLS 1.2+ minimum, removed Python 2.6/2.7 compatibility code, modernized SSL context handling
lib/py/src/transport/sslcompat.py	Simplified to TLS version enforcement utilities, removed legacy hostname validation
compiler/cpp/src/thrift/generate/t_py_generator.cc	Removed py2/py3 generator options, enforced IntEnum, added type hints, improved enum handling
lib/py/src/ext/module.cpp	Removed Python 2 C API code, simplified to Python 3 only
lib/py/test/test_sslsocket.py	Added comprehensive TLS tests, enforced TLS 1.2+, improved test stability
lib/py/test/thrift_TNonblockingServer.py	Fixed test shutdown sequence, added timeouts, improved cleanup ordering

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Build as Build System
    participant Compiler as Thrift Compiler
    participant PyLib as Python Library
    participant Tests as Test Suite
    
    Note over Dev,Tests: Python 2 Removal Process
    
    Dev->>Build: Update configure.ac (Python 3.10+)
    Dev->>Build: Update setup.py (python_requires='>=3.10')
    
    Dev->>Compiler: Remove py:old_style, py:new_style options
    Dev->>Compiler: Enforce IntEnum for all enums
    Dev->>Compiler: Add type hints to generated code
    
    Dev->>PyLib: Remove Python 2 C API code
    Dev->>PyLib: Simplify SSL/TLS (enforce TLS 1.2+)
    Dev->>PyLib: Remove backports.ssl_match_hostname
    Dev->>PyLib: Use modern SSLContext APIs
    
    Dev->>Tests: Add comprehensive type checking tests
    Dev->>Tests: Update SSL tests for TLS 1.2+
    Dev->>Tests: Fix server shutdown sequences
    Dev->>Tests: Remove 280+ py3-specific test entries
    
    Build->>Compiler: Generate Python code
    Compiler-->>Build: Modern Python 3.10+ code with type hints
    
    Build->>Tests: Run test suite
    Tests->>PyLib: Validate TLS 1.2+ enforcement
    Tests->>PyLib: Validate type hints with ty
    Tests-->>Build: All tests pass
    
    Build-->>Dev: Python 2 successfully removed

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