Merge pull request #1683 from brandonwillard/fix-py27-failed-import-modules
Fix `sys.modules` for failed imports in Python 2.7
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commit
4132adb9fe
@ -293,7 +293,8 @@ else:
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mod_type == imp.PKG_DIRECTORY and
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os.path.isfile(pkg_path)):
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if fullname in sys.modules:
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was_in_sys = fullname in sys.modules
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if was_in_sys:
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mod = sys.modules[fullname]
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else:
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mod = sys.modules.setdefault(
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@ -311,7 +312,15 @@ else:
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mod.__name__ = fullname
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try:
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self.exec_module(mod, fullname=fullname)
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except Exception:
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# Follow Python 2.7 logic and only remove a new, bad
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# module; otherwise, leave the old--and presumably
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# good--module in there.
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if not was_in_sys:
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del sys.modules[fullname]
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raise
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if mod is None:
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self._reopen()
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@ -5,7 +5,6 @@
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import os
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import sys
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import ast
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import imp
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import tempfile
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import runpy
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import importlib
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@ -15,12 +14,16 @@ from fractions import Fraction
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import pytest
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import hy
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from hy._compat import bytes_type
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from hy.errors import HyTypeError
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from hy.lex import LexException
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from hy.compiler import hy_compile
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from hy.importer import hy_parse, HyLoader, cache_from_source
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try:
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from importlib import reload
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except ImportError:
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from imp import reload
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def test_basics():
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"Make sure the basics of the importer work"
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@ -85,6 +88,15 @@ def test_import_error_reporting():
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assert _import_error_test() is not None
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def test_import_error_cleanup():
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"Failed initial imports should not leave dead modules in `sys.modules`."
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with pytest.raises(hy.errors.HyMacroExpansionError):
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importlib.import_module('tests.resources.fails')
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assert 'tests.resources.fails' not in sys.modules
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@pytest.mark.skipif(sys.dont_write_bytecode,
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reason="Bytecode generation is suppressed")
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def test_import_autocompiles():
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@ -127,7 +139,13 @@ def test_eval():
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def test_reload():
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"""Copied from CPython's `test_import.py`"""
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"""Generate a test module, confirm that it imports properly (and puts the
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module in `sys.modules`), then modify the module so that it produces an
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error when reloaded. Next, fix the error, reload, and check that the
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module is updated and working fine. Rinse, repeat.
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This test is adapted from CPython's `test_import.py`.
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"""
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def unlink(filename):
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os.unlink(source)
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@ -160,7 +178,7 @@ def test_reload():
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f.write("(setv b (// 20 0))")
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with pytest.raises(ZeroDivisionError):
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imp.reload(mod)
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reload(mod)
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# But we still expect the module to be in sys.modules.
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mod = sys.modules.get(TESTFN)
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@ -178,7 +196,7 @@ def test_reload():
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f.write("(setv a 11)")
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f.write("(setv b (// 20 1))")
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imp.reload(mod)
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reload(mod)
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mod = sys.modules.get(TESTFN)
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assert mod is not None
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@ -186,15 +204,17 @@ def test_reload():
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assert mod.a == 11
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assert mod.b == 20
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# Now cause a LexException
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# Now cause a `LexException`, and confirm that the good module and its
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# contents stick around.
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unlink(source)
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with open(source, "w") as f:
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# Missing paren...
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f.write("(setv a 11")
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f.write("(setv b (// 20 1))")
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with pytest.raises(LexException):
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imp.reload(mod)
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reload(mod)
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mod = sys.modules.get(TESTFN)
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assert mod is not None
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@ -209,7 +229,7 @@ def test_reload():
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f.write("(setv a 12)")
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f.write("(setv b (// 10 1))")
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imp.reload(mod)
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reload(mod)
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mod = sys.modules.get(TESTFN)
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assert mod is not None
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@ -219,8 +239,9 @@ def test_reload():
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finally:
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del sys.path[0]
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unlink(source)
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if TESTFN in sys.modules:
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del sys.modules[TESTFN]
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unlink(source)
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def test_circular():
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5
tests/resources/fails.hy
Normal file
5
tests/resources/fails.hy
Normal file
@ -0,0 +1,5 @@
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"This module produces an error when imported."
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(defmacro a-macro [x]
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(+ x 1))
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(print (a-macro 'blah))
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