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)
python类FileIO()的实例源码
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 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 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'):
# 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 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 setUp(self):
self.f = _FileIO(TESTFN, 'w')
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 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 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:
