Add support for Python 3.14 #9790
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #9790 +/- ##
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- Coverage 93.40% 93.33% -0.07%
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Files 211 209 -2
Lines 17012 16807 -205
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- Hits 15890 15687 -203
+ Misses 1122 1120 -2 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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ashovlin
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Oct 14, 2025
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aws-sdk-python-automation
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Oct 15, 2025
* release-1.42.53: Bumping version to 1.42.53 Update changelog based on model updates Add support for Python 3.14 (#9790)
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aemous
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Oct 22, 2025
adev-code
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Python 3.14+ argparse treats % characters in help strings as format specifiers. When service model documentation contains % (e.g., IAM's UpdateAccountPasswordPolicy RequireSymbols parameter), argparse raises: ValueError: unsupported format character '^' (0x5e) at index 129 This was already fixed for CLIArgument in PR aws#9790 but BooleanArgument was missed. This commit adds the same .replace('%', '%%') escaping to BooleanArgument.add_to_parser() and adds a test to verify all service operations with % in documentation work correctly. Fixes compatibility with Python 3.14+
adev-code
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Python 3.14+ argparse treats % characters in help strings as format specifiers. When service model documentation contains % (e.g., IAM's UpdateAccountPasswordPolicy RequireSymbols parameter), argparse raises: ValueError: unsupported format character '^' (0x5e) at index 129 This was already fixed for CLIArgument in PR aws#9790 but BooleanArgument was missed. This commit adds the same .replace('%', '%%') escaping to BooleanArgument.add_to_parser() and adds a test to verify all service operations with % in documentation work correctly. Fixes compatibility with Python 3.14+
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Add support for Python 3.14. Mostly chores:
It also replaces
%with%%when adding AWS CLI command parameters to the arg parser. The latest versions ofargparseadded a check to raise exceptions when invalid formatted strings are passed to the help docs: python/cpython#124899. Some command parameters will fail this check because they have%characters in them, eg fromaws s3api list-objects help:argparsesees%and thinks it's a formatted string that needs to be expanded. And then it throws an exception when it fails to do so. We escape it with%%so it's interpreted as a literal%.Verified that the bulit reference guide does not contain double
%: