tests/test-demandimport.py
author Augie Fackler <augie@google.com>
Sun, 06 Oct 2019 09:45:02 -0400
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child 44117 c5e0a9b97b8a
permissions -rw-r--r--
formatting: blacken the codebase This is using my patch to black (https://github.com/psf/black/pull/826) so we don't un-wrap collection literals. Done with: hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S # skip-blame mass-reformatting only # no-check-commit reformats foo_bar functions Differential Revision: https://phab.mercurial-scm.org/D6971
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from __future__ import absolute_import, print_function
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from mercurial import demandimport
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demandimport.enable()
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import os
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import subprocess
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import sys
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import types
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# Don't import pycompat because it has too many side-effects.
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ispy3 = sys.version_info[0] >= 3
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# Only run if demandimport is allowed
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if subprocess.call(
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    ['python', '%s/hghave' % os.environ['TESTDIR'], 'demandimport']
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):
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    sys.exit(80)
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# We rely on assert, which gets optimized out.
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if sys.flags.optimize:
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    sys.exit(80)
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if ispy3:
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    from importlib.util import _LazyModule
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    try:
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        from importlib.util import _Module as moduletype
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    except ImportError:
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        moduletype = types.ModuleType
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else:
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    moduletype = types.ModuleType
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if os.name != 'nt':
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    try:
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        import distutils.msvc9compiler
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        print(
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            'distutils.msvc9compiler needs to be an immediate '
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            'importerror on non-windows platforms'
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        )
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        distutils.msvc9compiler
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    except ImportError:
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        pass
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import re
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rsub = re.sub
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def f(obj):
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    l = repr(obj)
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    l = rsub("0x[0-9a-fA-F]+", "0x?", l)
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    l = rsub("from '.*'", "from '?'", l)
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    l = rsub("'<[a-z]*>'", "'<whatever>'", l)
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    return l
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demandimport.disable()
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os.environ['HGDEMANDIMPORT'] = 'disable'
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# this enable call should not actually enable demandimport!
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demandimport.enable()
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from mercurial import node
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# We use assert instead of a unittest test case because having imports inside
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# functions changes behavior of the demand importer.
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if ispy3:
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    assert not isinstance(node, _LazyModule)
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else:
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    assert f(node) == "<module 'mercurial.node' from '?'>", f(node)
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# now enable it for real
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del os.environ['HGDEMANDIMPORT']
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demandimport.enable()
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# Test access to special attributes through demandmod proxy
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assert 'mercurial.error' not in sys.modules
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from mercurial import error as errorproxy
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if ispy3:
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    # unsure why this isn't lazy.
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    assert not isinstance(f, _LazyModule)
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    assert f(errorproxy) == "<module 'mercurial.error' from '?'>", f(errorproxy)
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else:
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    assert f(errorproxy) == "<unloaded module 'error'>", f(errorproxy)
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doc = ' '.join(errorproxy.__doc__.split()[:3])
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assert doc == 'Mercurial exceptions. This', doc
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assert errorproxy.__name__ == 'mercurial.error', errorproxy.__name__
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# __name__ must be accessible via __dict__ so the relative imports can be
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# resolved
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name = errorproxy.__dict__['__name__']
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assert name == 'mercurial.error', name
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if ispy3:
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    assert not isinstance(errorproxy, _LazyModule)
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    assert f(errorproxy) == "<module 'mercurial.error' from '?'>", f(errorproxy)
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else:
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    assert f(errorproxy) == "<proxied module 'error'>", f(errorproxy)
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import os
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if ispy3:
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    assert not isinstance(os, _LazyModule)
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    assert f(os) == "<module 'os' from '?'>", f(os)
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else:
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    assert f(os) == "<unloaded module 'os'>", f(os)
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assert f(os.system) == '<built-in function system>', f(os.system)
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assert f(os) == "<module 'os' from '?'>", f(os)
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assert 'mercurial.utils.procutil' not in sys.modules
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from mercurial.utils import procutil
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    assert isinstance(procutil, _LazyModule)
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    assert f(procutil) == "<module 'mercurial.utils.procutil' from '?'>", f(
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        procutil
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    )
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else:
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    assert f(procutil) == "<unloaded module 'procutil'>", f(procutil)
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assert f(procutil.system) == '<function system at 0x?>', f(procutil.system)
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assert procutil.__class__ == moduletype, procutil.__class__
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assert f(procutil) == "<module 'mercurial.utils.procutil' from '?'>", f(
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    procutil
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)
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assert f(procutil.system) == '<function system at 0x?>', f(procutil.system)
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assert 'mercurial.hgweb' not in sys.modules
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from mercurial import hgweb
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if ispy3:
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    assert not isinstance(hgweb, _LazyModule)
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    assert f(hgweb) == "<module 'mercurial.hgweb' from '?'>", f(hgweb)
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    assert isinstance(hgweb.hgweb_mod, _LazyModule)
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    assert (
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        f(hgweb.hgweb_mod) == "<module 'mercurial.hgweb.hgweb_mod' from '?'>"
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    ), f(hgweb.hgweb_mod)
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else:
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    assert f(hgweb) == "<unloaded module 'hgweb'>", f(hgweb)
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    assert f(hgweb.hgweb_mod) == "<unloaded module 'hgweb_mod'>", f(
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        hgweb.hgweb_mod
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    )
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assert f(hgweb) == "<module 'mercurial.hgweb' from '?'>", f(hgweb)
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import re as fred
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if ispy3:
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    assert not isinstance(fred, _LazyModule)
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    assert f(fred) == "<module 're' from '?'>"
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else:
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    assert f(fred) == "<unloaded module 're'>", f(fred)
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import re as remod
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if ispy3:
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    assert not isinstance(remod, _LazyModule)
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    assert f(remod) == "<module 're' from '?'>"
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else:
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    assert f(remod) == "<unloaded module 're'>", f(remod)
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import sys as re
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if ispy3:
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    assert not isinstance(re, _LazyModule)
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    assert f(re) == "<module 'sys' (built-in)>"
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else:
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    assert f(re) == "<unloaded module 'sys'>", f(re)
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if ispy3:
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    assert not isinstance(fred, _LazyModule)
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    assert f(fred) == "<module 're' from '?'>", f(fred)
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else:
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    assert f(fred) == "<unloaded module 're'>", f(fred)
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assert f(fred.sub) == '<function sub at 0x?>', f(fred.sub)
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if ispy3:
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    assert not isinstance(fred, _LazyModule)
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    assert f(fred) == "<module 're' from '?'>", f(fred)
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else:
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    assert f(fred) == "<proxied module 're'>", f(fred)
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remod.escape  # use remod
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assert f(remod) == "<module 're' from '?'>", f(remod)
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if ispy3:
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    assert not isinstance(re, _LazyModule)
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    assert f(re) == "<module 'sys' (built-in)>"
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    assert f(type(re.stderr)) == "<class '_io.TextIOWrapper'>", f(
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        type(re.stderr)
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    )
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    assert f(re) == "<module 'sys' (built-in)>"
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else:
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    assert f(re) == "<unloaded module 'sys'>", f(re)
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    assert f(re.stderr) == "<open file '<whatever>', mode 'w' at 0x?>", f(
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        re.stderr
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    )
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    assert f(re) == "<proxied module 'sys'>", f(re)
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assert 'telnetlib' not in sys.modules
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import telnetlib
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if ispy3:
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    assert not isinstance(telnetlib, _LazyModule)
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    assert f(telnetlib) == "<module 'telnetlib' from '?'>"
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else:
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    assert f(telnetlib) == "<unloaded module 'telnetlib'>", f(telnetlib)
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try:
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    from telnetlib import unknownattr
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    assert False, (
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        'no demandmod should be created for attribute of non-package '
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        'module:\ntelnetlib.unknownattr = %s' % f(unknownattr)
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    )
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except ImportError as inst:
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    assert rsub(r"'", '', str(inst)).startswith(
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        'cannot import name unknownattr'
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    )
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   225
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   226
from mercurial import util
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# Unlike the import statement, __import__() function should not raise
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# ImportError even if fromlist has an unknown item
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# (see Python/import.c:import_module_level() and ensure_fromlist())
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assert 'zipfile' not in sys.modules
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zipfileimp = __import__('zipfile', globals(), locals(), ['unknownattr'])
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assert f(zipfileimp) == "<module 'zipfile' from '?'>", f(zipfileimp)
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assert not util.safehasattr(zipfileimp, 'unknownattr')