47 lines
2.0 KiB
Python
47 lines
2.0 KiB
Python
"""Python 3.8 syntax floor for everything that runs on a member's machine.
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bastion agent stages and the PII service ship to whatever the owner runs — a
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Mac or Windows box may lag years behind Debian stable. The parser enforces
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the floor (`feature_version`), and a short denylist covers stdlib calls
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that parse fine on 3.8 and then fail at runtime. Add a directory here when
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a new module joins the portable set. Run: python3 -m unittest discover .
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"""
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import ast
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import os
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import unittest
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HERE = os.path.dirname(os.path.abspath(__file__))
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PORTABLE = ("bastion_agent", "pii")
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FLOOR = (3, 8)
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BANNED_CALLS = ("removeprefix(", "removesuffix(", "file_digest(", "is_relative_to(",
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"zoneinfo", "bisect_left(", "pairwise(") # bisect key= is 3.10
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class SyntaxFloorTests(unittest.TestCase):
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def test_portable_modules_parse_at_floor(self):
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checked = 0
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for pkg in PORTABLE:
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for name in sorted(os.listdir(os.path.join(HERE, pkg))):
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if not name.endswith(".py"):
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continue
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path = os.path.join(HERE, pkg, name)
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with open(path, encoding="utf-8") as fh:
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src = fh.read()
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ast.parse(src, filename=path, feature_version=FLOOR)
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# PEP 585 generics (list[str]) parse on 3.8 but raise at
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# import time; catch them by inspection.
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for node in ast.walk(ast.parse(src)):
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if isinstance(node, ast.Subscript) and isinstance(node.value, ast.Name) \
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and node.value.id in ("list", "dict", "tuple", "set", "type"):
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self.fail("%s: PEP 585 generic %s[...] needs typing.%s on 3.8"
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% (path, node.value.id, node.value.id.capitalize()))
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for banned in BANNED_CALLS:
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self.assertNotIn(banned, src, "%s uses %s" % (path, banned))
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checked += 1
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self.assertGreater(checked, 5)
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if __name__ == "__main__":
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unittest.main()
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