我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用_io.FileIO()。
def testAbles(self): try: f = _FileIO(TESTFN, "w") self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) self.assertEqual(f.seekable(), True) f.close() f = _FileIO(TESTFN, "r") self.assertEqual(f.readable(), True) self.assertEqual(f.writable(), False) self.assertEqual(f.seekable(), True) f.close() f = _FileIO(TESTFN, "a+") self.assertEqual(f.readable(), True) self.assertEqual(f.writable(), True) self.assertEqual(f.seekable(), True) self.assertEqual(f.isatty(), False) f.close() finally: os.unlink(TESTFN)
def testAblesOnTTY(self): try: f = _FileIO("/dev/tty", "a") except EnvironmentError: # When run in a cron job there just aren't any # ttys, so skip the test. This also handles other # OS'es that don't support /dev/tty. self.skipTest('need /dev/tty') else: self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) if sys.platform != "darwin" and \ 'bsd' not in sys.platform and \ not sys.platform.startswith(('sunos', 'aix')): # Somehow /dev/tty appears seekable on some BSDs self.assertEqual(f.seekable(), False) self.assertEqual(f.isatty(), True) f.close()
def testAblesOnTTY(self): try: f = _FileIO("/dev/tty", "a") except EnvironmentError: # When run in a cron job there just aren't any # ttys, so skip the test. This also handles other # OS'es that don't support /dev/tty. self.skipTest('need /dev/tty') else: self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) if sys.platform != "darwin" and \ 'bsd' not in sys.platform and \ not sys.platform.startswith('sunos'): # Somehow /dev/tty appears seekable on some BSDs self.assertEqual(f.seekable(), False) self.assertEqual(f.isatty(), True) f.close()
def test_surrogates(self): # Issue #8438: try to open a filename containing surrogates. # It should either fail because the file doesn't exist or the filename # can't be represented using the filesystem encoding, but not because # of a LookupError for the error handler "surrogateescape". filename = u'\udc80.txt' try: with _FileIO(filename): pass except (UnicodeEncodeError, IOError): pass # Spawn a separate Python process with a different "file system # default encoding", to exercise this further. env = dict(os.environ) env[b'LC_CTYPE'] = b'C' _, out = run_python('-c', 'import _io; _io.FileIO(%r)' % filename, env=env) if ('UnicodeEncodeError' not in out and not ( ('IOError: [Errno 2] No such file or directory' in out) or ('IOError: [Errno 22] Invalid argument' in out) ) ): self.fail('Bad output: %r' % out)
def setUp(self): self.f = _FileIO(TESTFN, 'w')
def testReadinto(self): # verify readinto self.f.write(bytes([1, 2])) self.f.close() a = array('b', b'x'*10) self.f = _FileIO(TESTFN, 'r') n = self.f.readinto(a) self.assertEqual(array('b', [1, 2]), a[:n])
def test_none_args(self): self.f.write(b"hi\nbye\nabc") self.f.close() self.f = _FileIO(TESTFN, 'r') self.assertEqual(self.f.read(None), b"hi\nbye\nabc") self.f.seek(0) self.assertEqual(self.f.readline(None), b"hi\n") self.assertEqual(self.f.readlines(None), [b"bye\n", b"abc"])
def testErrors(self): f = self.f self.assertTrue(not f.isatty()) self.assertTrue(not f.closed) #self.assertEqual(f.name, TESTFN) self.assertRaises(ValueError, f.read, 10) # Open for reading f.close() self.assertTrue(f.closed) f = _FileIO(TESTFN, 'r') self.assertRaises(TypeError, f.readinto, "") self.assertTrue(not f.closed) f.close() self.assertTrue(f.closed)
def testOpendir(self): # Issue 3703: opening a directory should fill the errno # Windows always returns "[Errno 13]: Permission denied # Unix calls dircheck() and returns "[Errno 21]: Is a directory" try: _FileIO('.', 'r') except IOError as e: self.assertNotEqual(e.errno, 0) self.assertEqual(e.filename, ".") else: self.fail("Should have raised IOError") #A set of functions testing that we get expected behaviour if someone has #manually closed the internal file descriptor. First, a decorator:
def testAbles(self): try: f = _FileIO(TESTFN, "w") self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) self.assertEqual(f.seekable(), True) f.close() f = _FileIO(TESTFN, "r") self.assertEqual(f.readable(), True) self.assertEqual(f.writable(), False) self.assertEqual(f.seekable(), True) f.close() f = _FileIO(TESTFN, "a+") self.assertEqual(f.readable(), True) self.assertEqual(f.writable(), True) self.assertEqual(f.seekable(), True) self.assertEqual(f.isatty(), False) f.close() if sys.platform != "win32": try: f = _FileIO("/dev/tty", "a") except EnvironmentError: # When run in a cron job there just aren't any # ttys, so skip the test. This also handles other # OS'es that don't support /dev/tty. pass else: self.assertEqual(f.readable(), False) self.assertEqual(f.writable(), True) if sys.platform != "darwin" and \ 'bsd' not in sys.platform and \ not sys.platform.startswith('sunos'): # Somehow /dev/tty appears seekable on some BSDs self.assertEqual(f.seekable(), False) self.assertEqual(f.isatty(), True) f.close() finally: os.unlink(TESTFN)
def testModeStrings(self): # check invalid mode strings for mode in ("", "aU", "wU+", "rw", "rt"): try: f = _FileIO(TESTFN, mode) except ValueError: pass else: f.close() self.fail('%r is an invalid file mode' % mode)
def testUnicodeOpen(self): # verify repr works for unicode too f = _FileIO(str(TESTFN), "w") f.close() os.unlink(TESTFN)
def testBytesOpen(self): # Opening a bytes filename try: fn = TESTFN.encode("ascii") except UnicodeEncodeError: # Skip test return f = _FileIO(fn, "w") try: f.write(b"abc") f.close() with open(TESTFN, "rb") as f: self.assertEqual(f.read(), b"abc") finally: os.unlink(TESTFN)
def testConstructorHandlesNULChars(self): fn_with_NUL = 'foo\0bar' self.assertRaises(TypeError, _FileIO, fn_with_NUL, 'w') self.assertRaises(TypeError, _FileIO, bytes(fn_with_NUL, 'ascii'), 'w')
def testBadModeArgument(self): # verify that we get a sensible error message for bad mode argument bad_mode = "qwerty" try: f = _FileIO(TESTFN, bad_mode) except ValueError as msg: if msg.args[0] != 0: s = str(msg) if TESTFN in s or bad_mode not in s: self.fail("bad error message for invalid mode: %s" % s) # if msg.args[0] == 0, we're probably on Windows where there may be # no obvious way to discover why open() failed. else: f.close() self.fail("no error for invalid mode: %s" % bad_mode)
def testTruncate(self): f = _FileIO(TESTFN, 'w') f.write(bytes(bytearray(range(10)))) self.assertEqual(f.tell(), 10) f.truncate(5) self.assertEqual(f.tell(), 10) self.assertEqual(f.seek(0, os.SEEK_END), 5) f.truncate(15) self.assertEqual(f.tell(), 5) self.assertEqual(f.seek(0, os.SEEK_END), 15) f.close()
def testTruncateOnWindows(self): def bug801631(): # SF bug <http://www.python.org/sf/801631> # "file.truncate fault on windows" f = _FileIO(TESTFN, 'w') f.write(bytes(range(11))) f.close() f = _FileIO(TESTFN,'r+') data = f.read(5) if data != bytes(range(5)): self.fail("Read on file opened for update failed %r" % data) if f.tell() != 5: self.fail("File pos after read wrong %d" % f.tell()) f.truncate() if f.tell() != 5: self.fail("File pos after ftruncate wrong %d" % f.tell()) f.close() size = os.path.getsize(TESTFN) if size != 5: self.fail("File size after ftruncate wrong %d" % size) try: bug801631() finally: os.unlink(TESTFN)
def testInvalidInit(self): self.assertRaises(TypeError, _FileIO, "1", 0, 0)
def testWarnings(self): with check_warnings(quiet=True) as w: self.assertEqual(w.warnings, []) self.assertRaises(TypeError, _FileIO, []) self.assertEqual(w.warnings, []) self.assertRaises(ValueError, _FileIO, "/some/invalid/name", "rt") self.assertEqual(w.warnings, [])
def testReadinto(self): # verify readinto self.f.write(b"\x01\x02") self.f.close() a = array(b'b', b'x'*10) self.f = _FileIO(TESTFN, 'r') n = self.f.readinto(a) self.assertEqual(array(b'b', [1, 2]), a[:n])
def testWritelinesList(self): l = [b'123', b'456'] self.f.writelines(l) self.f.close() self.f = _FileIO(TESTFN, 'rb') buf = self.f.read() self.assertEqual(buf, b'123456')
def testWritelinesUserList(self): l = UserList([b'123', b'456']) self.f.writelines(l) self.f.close() self.f = _FileIO(TESTFN, 'rb') buf = self.f.read() self.assertEqual(buf, b'123456')
def testOpendir(self): # Issue 3703: opening a directory should fill the errno # Windows always returns "[Errno 13]: Permission denied # Unix calls dircheck() and returns "[Errno 21]: Is a directory" try: _FileIO('.', 'r') except IOError as e: self.assertNotEqual(e.errno, 0) self.assertEqual(e.filename, ".") else: self.fail("Should have raised IOError")
def testOpenDirFD(self): fd = os.open('.', os.O_RDONLY) with self.assertRaises(IOError) as cm: _FileIO(fd, 'r') os.close(fd) self.assertEqual(cm.exception.errno, errno.EISDIR) #A set of functions testing that we get expected behaviour if someone has #manually closed the internal file descriptor. First, a decorator:
def ReopenForRead(self): try: self.f.close() except IOError: pass self.f = _FileIO(TESTFN, 'r') os.close(self.f.fileno()) return self.f
def testModeStrings(self): # test that the mode attribute is correct for various mode strings # given as init args try: for modes in [('w', 'wb'), ('wb', 'wb'), ('wb+', 'rb+'), ('w+b', 'rb+'), ('a', 'ab'), ('ab', 'ab'), ('ab+', 'ab+'), ('a+b', 'ab+'), ('r', 'rb'), ('rb', 'rb'), ('rb+', 'rb+'), ('r+b', 'rb+')]: # read modes are last so that TESTFN will exist first with _FileIO(TESTFN, modes[0]) as f: self.assertEqual(f.mode, modes[1]) finally: if os.path.exists(TESTFN): os.unlink(TESTFN)
def testBytesOpen(self): # Opening a bytes filename try: fn = TESTFN.encode("ascii") except UnicodeEncodeError: self.skipTest('could not encode %r to ascii' % TESTFN) f = _FileIO(fn, "w") try: f.write(b"abc") f.close() with open(TESTFN, "rb") as f: self.assertEqual(f.read(), b"abc") finally: os.unlink(TESTFN)
def testConstructorHandlesNULChars(self): fn_with_NUL = 'foo\0bar' self.assertRaises(TypeError, _FileIO, fn_with_NUL, 'w') self.assertRaises(TypeError, _FileIO, fn_with_NUL.encode('ascii'), 'w')
def testInvalidFd(self): self.assertRaises(ValueError, _FileIO, -10) self.assertRaises(OSError, _FileIO, make_bad_fd()) if sys.platform == 'win32': import msvcrt self.assertRaises(IOError, msvcrt.get_osfhandle, make_bad_fd())
def testUnclosedFDOnException(self): class MyException(Exception): pass class MyFileIO(_FileIO): def __setattr__(self, name, value): if name == "name": raise MyException("blocked setting name") return super(MyFileIO, self).__setattr__(name, value) fd = os.open(__file__, os.O_RDONLY) self.assertRaises(MyException, MyFileIO, fd) os.close(fd) # should not raise OSError(EBADF)
