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//usr/lib/python2.4/test/test_import.py
from test.test_support import TESTFN, TestFailed import os import random import sys import py_compile # 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: raise TestFailed("import of RAnDoM should have failed (case mismatch)") # Another brief digression to test the accuracy of manifest float constants. import double_const # don't blink -- that *was* the test def remove_files(name): for f in (name + os.extsep + "py", name + os.extsep + "pyc", name + os.extsep + "pyo", name + os.extsep + "pyw", name + "$py.class"): if os.path.exists(f): os.remove(f) def test_with_extension(ext): # ext normally ".py"; perhaps ".pyw" source = TESTFN + ext pyo = TESTFN + os.extsep + "pyo" if sys.platform.startswith('java'): pyc = TESTFN + "$py.class" else: pyc = TESTFN + os.extsep + "pyc" f = open(source, "w") print >> f, "# This tests Python's ability to import a", ext, "file." a = random.randrange(1000) b = random.randrange(1000) print >> f, "a =", a print >> f, "b =", b f.close() try: try: mod = __import__(TESTFN) except ImportError, err: raise ValueError("import from %s failed: %s" % (ext, err)) if mod.a != a or mod.b != b: print a, "!=", mod.a print b, "!=", mod.b raise ValueError("module loaded (%s) but contents invalid" % mod) finally: os.unlink(source) try: try: reload(mod) except ImportError, err: raise ValueError("import from .pyc/.pyo failed: %s" % err) finally: try: os.unlink(pyc) except os.error: pass try: os.unlink(pyo) except os.error: 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] # 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(module): # 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) test_module_with_large_stack('longlist') def test_failing_import_sticks(): source = TESTFN + os.extsep + "py" f = open(source, "w") print >> f, "a = 1/0" 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: raise TestFailed("damaged module in sys.modules", i) else: raise TestFailed("was able to import a damaged module", i) finally: sys.path.pop(0) remove_files(TESTFN) test_failing_import_sticks() def test_failing_reload(): # A failing reload should leave the module object in sys.modules. source = TESTFN + os.extsep + "py" f = open(source, "w") print >> f, "a = 1" print >> f, "b = 2" f.close() sys.path.insert(0, os.curdir) try: mod = __import__(TESTFN) if TESTFN not in sys.modules: raise TestFailed("expected module in sys.modules") if mod.a != 1 or mod.b != 2: raise TestFailed("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 >> f, "a = 10" print >> f, "b = 20//0" f.close() try: reload(mod) except ZeroDivisionError: pass else: raise TestFailed("was able to reload a damaged module") # But we still expect the module to be in sys.modules. mod = sys.modules.get(TESTFN) if mod is None: raise TestFailed("expected module to still be in sys.modules") # We should have replaced a w/ 10, but the old b value should # stick. if mod.a != 10 or mod.b != 2: raise TestFailed("module has wrong attribute values") finally: sys.path.pop(0) remove_files(TESTFN) if TESTFN in sys.modules: del sys.modules[TESTFN] test_failing_reload()