from test.test_support import TESTFN, run_unittest, guard_warnings_filter import unittest import os import random import sys import py_compile import warnings def remove_files(name): for f in (name + os.extsep + "py", name + os.extsep + "pyc", name + os.extsep + "pyo", name + os.extsep + "pyw", name + "$py.class"): if os.path.exists(f): os.remove(f) class ImportTest(unittest.TestCase): def testCaseSensitivity(self): # Brief digression to test that import is case-sensitive: if we got this # far, we know for sure that "random" exists. try: import RAnDoM except ImportError: pass else: self.fail("import of RAnDoM should have failed (case mismatch)") def testDoubleConst(self): # Another brief digression to test the accuracy of manifest float constants. from test import double_const # don't blink -- that *was* the test def testImport(self): def test_with_extension(ext): # ext normally ".py"; perhaps ".pyw" source = TESTFN + ext pyo = TESTFN + os.extsep + "pyo" if sys.platform.startswith('java'): pyc = TESTFN + "$py.class" else: pyc = TESTFN + os.extsep + "pyc" f = open(source, "w") print("# This tests Python's ability to import a", ext, "file.", file=f) a = random.randrange(1000) b = random.randrange(1000) print("a =", a, file=f) print("b =", b, file=f) f.close() try: try: mod = __import__(TESTFN) except ImportError as err: self.fail("import from %s failed: %s" % (ext, err)) self.assertEquals(mod.a, a, "module loaded (%s) but contents invalid" % mod) self.assertEquals(mod.b, b, "module loaded (%s) but contents invalid" % mod) finally: os.unlink(source) try: try: reload(mod) except ImportError as err: self.fail("import from .pyc/.pyo failed: %s" % err) finally: try: os.unlink(pyc) except OSError: pass try: os.unlink(pyo) except OSError: pass del sys.modules[TESTFN] sys.path.insert(0, os.curdir) try: test_with_extension(os.extsep + "py") if sys.platform.startswith("win"): for ext in ".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw": test_with_extension(ext) finally: del sys.path[0] def testImpModule(self): # Verify that the imp module can correctly load and find .py files import imp x = imp.find_module("os") os = imp.load_module("os", *x) def test_module_with_large_stack(self, module='longlist'): # create module w/list of 65000 elements to test bug #561858 filename = module + os.extsep + 'py' # create a file with a list of 65000 elements f = open(filename, 'w+') f.write('d = [\n') for i in range(65000): f.write('"",\n') f.write(']') f.close() # compile & remove .py file, we only need .pyc (or .pyo) f = open(filename, 'r') py_compile.compile(filename) f.close() os.unlink(filename) # need to be able to load from current dir sys.path.append('') # this used to crash exec('import ' + module) # cleanup del sys.path[-1] for ext in 'pyc', 'pyo': fname = module + os.extsep + ext if os.path.exists(fname): os.unlink(fname) def test_failing_import_sticks(self): source = TESTFN + os.extsep + "py" f = open(source, "w") print("a = 1/0", file=f) f.close() # New in 2.4, we shouldn't be able to import that no matter how often # we try. sys.path.insert(0, os.curdir) try: for i in 1, 2, 3: try: mod = __import__(TESTFN) except ZeroDivisionError: if TESTFN in sys.modules: self.fail("damaged module in sys.modules on %i. try" % i) else: self.fail("was able to import a damaged module on %i. try" % i) finally: sys.path.pop(0) remove_files(TESTFN) def test_failing_reload(self): # A failing reload should leave the module object in sys.modules. source = TESTFN + os.extsep + "py" f = open(source, "w") print("a = 1", file=f) print("b = 2", file=f) f.close() sys.path.insert(0, os.curdir) try: mod = __import__(TESTFN) self.assert_(TESTFN in sys.modules, "expected module in sys.modules") self.assertEquals(mod.a, 1, "module has wrong attribute values") self.assertEquals(mod.b, 2, "module has wrong attribute values") # On WinXP, just replacing the .py file wasn't enough to # convince reload() to reparse it. Maybe the timestamp didn't # move enough. We force it to get reparsed by removing the # compiled file too. remove_files(TESTFN) # Now damage the module. f = open(source, "w") print("a = 10", file=f) print("b = 20//0", file=f) f.close() self.assertRaises(ZeroDivisionError, reload, mod) # But we still expect the module to be in sys.modules. mod = sys.modules.get(TESTFN) self.failIf(mod is None, "expected module to still be in sys.modules") # We should have replaced a w/ 10, but the old b value should # stick. self.assertEquals(mod.a, 10, "module has wrong attribute values") self.assertEquals(mod.b, 2, "module has wrong attribute values") finally: sys.path.pop(0) remove_files(TESTFN) if TESTFN in sys.modules: del sys.modules[TESTFN] def test_infinite_reload(self): # Bug #742342 reports that Python segfaults (infinite recursion in C) # when faced with self-recursive reload()ing. sys.path.insert(0, os.path.dirname(__file__)) try: import infinite_reload finally: sys.path.pop(0) def test_import_name_binding(self): # import x.y.z binds x in the current namespace import test as x import test.test_support self.assert_(x is test, x.__name__) self.assert_(hasattr(test.test_support, "__file__")) # import x.y.z as w binds z as w import test.test_support as y self.assert_(y is test.test_support, y.__name__) def test_import_initless_directory_warning(self): with guard_warnings_filter(): # Just a random non-package directory we always expect to be # somewhere in sys.path... warnings.simplefilter('error', ImportWarning) self.assertRaises(ImportWarning, __import__, "site-packages") def test_main(verbose=None): run_unittest(ImportTest) if __name__ == '__main__': test_main()