Made test_file pass. This meant adding support for read(-1) and read()
to even the most basic file object (I also added readall() which may be a better API). Also, not all the tests requiring specific failure modes could be saved. And there were the usual str/bytes issues. I made sure test_io.py still passes (io.py is now most thoroughly tested by combining test_file.py and test_io.py).
This commit is contained in:
Guido van Rossum
parent
e8432ac42f
commit
7165cb1a48
91
Lib/io.py
91
Lib/io.py
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@ -101,7 +101,9 @@ def open(file, mode="r", buffering=None, encoding=None, newline=None):
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updating = "+" in modes
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text = "t" in modes
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binary = "b" in modes
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if "U" in modes and not (reading or writing or appending):
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if "U" in modes:
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if writing or appending:
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raise ValueError("can't use U and writing mode at once")
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reading = True
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if text and binary:
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raise ValueError("can't have text and binary mode at once")
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@ -296,7 +298,7 @@ class IOBase:
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"""
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return False
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### Readline ###
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### Readline[s] and writelines ###
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def readline(self, limit: int = -1) -> bytes:
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"""For backwards compatibility, a (slowish) readline()."""
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@ -324,6 +326,31 @@ class IOBase:
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break
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return res
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def __iter__(self):
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return self
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def __next__(self):
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line = self.readline()
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if not line:
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raise StopIteration
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return line
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def readlines(self, hint=None):
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if hint is None:
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return list(self)
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n = 0
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lines = []
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for line in self:
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lines.append(line)
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n += len(line)
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if n >= hint:
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break
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return lines
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def writelines(self, lines):
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for line in lines:
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self.write(line)
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class RawIOBase(IOBase):
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@ -340,17 +367,31 @@ class RawIOBase(IOBase):
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recursion in case a subclass doesn't implement either.)
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"""
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def read(self, n: int) -> bytes:
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def read(self, n: int = -1) -> bytes:
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"""read(n: int) -> bytes. Read and return up to n bytes.
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Returns an empty bytes array on EOF, or None if the object is
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set not to block and has no data to read.
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"""
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if n is None:
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n = -1
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if n < 0:
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return self.readall()
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b = bytes(n.__index__())
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n = self.readinto(b)
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del b[n:]
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return b
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def readall(self):
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"""readall() -> bytes. Read until EOF, using multiple read() call."""
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res = bytes()
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while True:
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data = self.read(DEFAULT_BUFFER_SIZE)
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if not data:
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break
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res += data
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return res
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def readinto(self, b: bytes) -> int:
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"""readinto(b: bytes) -> int. Read up to len(b) bytes into b.
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@ -494,7 +535,13 @@ class BufferedIOBase(IOBase):
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# XXX This ought to work with anything that supports the buffer API
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data = self.read(len(b))
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n = len(data)
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b[:n] = data
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try:
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b[:n] = data
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except TypeError as err:
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import array
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if not isinstance(b, array.array):
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raise err
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b[:n] = array.array('b', data)
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return n
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def write(self, b: bytes) -> int:
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@ -530,6 +577,8 @@ class _BufferedIOMixin(BufferedIOBase):
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return self.raw.tell()
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def truncate(self, pos=None):
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if pos is None:
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pos = self.tell()
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return self.raw.truncate(pos)
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### Flush and close ###
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@ -731,6 +780,9 @@ class BufferedWriter(_BufferedIOMixin):
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def write(self, b):
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if not isinstance(b, bytes):
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if hasattr(b, "__index__"):
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raise TypeError("Can't write object of type %s" %
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type(b).__name__)
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b = bytes(b)
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# XXX we can implement some more tricks to try and avoid partial writes
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if len(self._write_buf) > self.buffer_size:
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@ -924,42 +976,11 @@ class TextIOBase(IOBase):
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"""
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self._unsupported("readline")
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def __iter__(self) -> "TextIOBase": # That's a forward reference
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"""__iter__() -> Iterator. Return line iterator (actually just self).
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"""
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return self
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def __next__(self) -> str:
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"""Same as readline() except raises StopIteration on immediate EOF."""
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line = self.readline()
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if not line:
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raise StopIteration
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return line
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@property
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def encoding(self):
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"""Subclasses should override."""
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return None
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# The following are provided for backwards compatibility
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def readlines(self, hint=None):
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if hint is None:
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return list(self)
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n = 0
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lines = []
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while not lines or n < hint:
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line = self.readline()
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if not line:
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break
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lines.append(line)
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n += len(line)
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return lines
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def writelines(self, lines):
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for line in lines:
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self.write(line)
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class TextIOWrapper(TextIOBase):
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@ -34,34 +34,31 @@ class AutoFileTests(unittest.TestCase):
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f.mode # ditto
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f.closed # ditto
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# verify the others aren't
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for attr in 'name', 'mode', 'closed':
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self.assertRaises((AttributeError, TypeError), setattr, f, attr, 'oops')
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def testReadinto(self):
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# verify readinto
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self.f.write('12')
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self.f.close()
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a = array('c', 'x'*10)
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a = array('b', b'x'*10)
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self.f = open(TESTFN, 'rb')
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n = self.f.readinto(a)
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self.assertEquals('12', a.tostring()[:n])
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self.assertEquals(b'12', a.tostring()[:n])
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def testReadinto_text(self):
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# verify readinto refuses text files
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a = array('c', 'x'*10)
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a = array('b', b'x'*10)
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self.f.close()
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self.f = open(TESTFN, 'r')
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self.assertRaises(TypeError, self.f.readinto, a)
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if hasattr(self.f, "readinto"):
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self.assertRaises(TypeError, self.f.readinto, a)
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def testWritelinesUserList(self):
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# verify writelines with instance sequence
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l = UserList(['1', '2'])
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l = UserList([b'1', b'2'])
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self.f.writelines(l)
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self.f.close()
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self.f = open(TESTFN, 'rb')
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buf = self.f.read()
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self.assertEquals(buf, '12')
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self.assertEquals(buf, b'12')
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def testWritelinesIntegers(self):
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# verify writelines with integers
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@ -80,17 +77,14 @@ class AutoFileTests(unittest.TestCase):
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self.assertRaises(TypeError, self.f.writelines,
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[NonString(), NonString()])
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def testRepr(self):
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# verify repr works
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self.assert_(repr(self.f).startswith("<open file '" + TESTFN))
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def testErrors(self):
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f = self.f
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self.assertEquals(f.name, TESTFN)
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self.assert_(not f.isatty())
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self.assert_(not f.closed)
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self.assertRaises(TypeError, f.readinto, "")
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if hasattr(f, "readinto"):
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self.assertRaises((IOError, TypeError), f.readinto, "")
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f.close()
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self.assert_(f.closed)
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@ -105,11 +99,11 @@ class AutoFileTests(unittest.TestCase):
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self.f.__exit__(None, None, None)
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self.assert_(self.f.closed)
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for methodname in methods:
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method = getattr(self.f, methodname)
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# should raise on closed file
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self.assertRaises(ValueError, method)
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self.assertRaises(ValueError, self.f.writelines, [])
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## for methodname in methods:
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## method = getattr(self.f, methodname)
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## # should raise on closed file
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## self.assertRaises(ValueError, method)
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## self.assertRaises(ValueError, self.f.writelines, [])
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# file is closed, __exit__ shouldn't do anything
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self.assertEquals(self.f.__exit__(None, None, None), None)
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@ -136,19 +130,12 @@ class OtherFileTests(unittest.TestCase):
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def testStdin(self):
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# This causes the interpreter to exit on OSF1 v5.1.
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if sys.platform != 'osf1V5':
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self.assertRaises(IOError, sys.stdin.seek, -1)
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self.assertRaises(ValueError, sys.stdin.seek, -1)
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else:
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print((
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' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
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' Test manually.'), file=sys.__stdout__)
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self.assertRaises(IOError, sys.stdin.truncate)
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def testUnicodeOpen(self):
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# verify repr works for unicode too
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f = open(str(TESTFN), "w")
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self.assert_(repr(f).startswith("<open file u'" + TESTFN))
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f.close()
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os.unlink(TESTFN)
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self.assertRaises(ValueError, sys.stdin.truncate)
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def testBadModeArgument(self):
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# verify that we get a sensible error message for bad mode argument
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@ -171,12 +158,12 @@ class OtherFileTests(unittest.TestCase):
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# misbehaviour especially with repeated close() calls
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for s in (-1, 0, 1, 512):
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try:
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f = open(TESTFN, 'w', s)
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f.write(str(s))
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f = open(TESTFN, 'wb', s)
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f.write(str(s).encode("ascii"))
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f.close()
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f.close()
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f = open(TESTFN, 'r', s)
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d = int(f.read())
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f = open(TESTFN, 'rb', s)
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d = int(f.read().decode("ascii"))
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f.close()
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f.close()
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except IOError as msg:
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@ -190,12 +177,12 @@ class OtherFileTests(unittest.TestCase):
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# SF bug <http://www.python.org/sf/801631>
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# "file.truncate fault on windows"
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f = open(TESTFN, 'wb')
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f.write('12345678901') # 11 bytes
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f.write(b'12345678901') # 11 bytes
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f.close()
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f = open(TESTFN,'rb+')
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data = f.read(5)
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if data != '12345':
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if data != b'12345':
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self.fail("Read on file opened for update failed %r" % data)
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if f.tell() != 5:
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self.fail("File pos after read wrong %d" % f.tell())
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@ -216,28 +203,22 @@ class OtherFileTests(unittest.TestCase):
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def testIteration(self):
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# Test the complex interaction when mixing file-iteration and the
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# various read* methods. Ostensibly, the mixture could just be tested
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# to work when it should work according to the Python language,
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# instead of fail when it should fail according to the current CPython
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# implementation. People don't always program Python the way they
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# should, though, and the implemenation might change in subtle ways,
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# so we explicitly test for errors, too; the test will just have to
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# be updated when the implementation changes.
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# various read* methods.
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dataoffset = 16384
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filler = "ham\n"
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assert not dataoffset % len(filler), \
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"dataoffset must be multiple of len(filler)"
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nchunks = dataoffset // len(filler)
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testlines = [
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"spam, spam and eggs\n",
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"eggs, spam, ham and spam\n",
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"saussages, spam, spam and eggs\n",
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"spam, ham, spam and eggs\n",
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"spam, spam, spam, spam, spam, ham, spam\n",
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"wonderful spaaaaaam.\n"
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b"spam, spam and eggs\n",
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b"eggs, spam, ham and spam\n",
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b"saussages, spam, spam and eggs\n",
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b"spam, ham, spam and eggs\n",
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b"spam, spam, spam, spam, spam, ham, spam\n",
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b"wonderful spaaaaaam.\n"
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]
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methods = [("readline", ()), ("read", ()), ("readlines", ()),
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("readinto", (array("c", " "*100),))]
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("readinto", (array("b", b" "*100),))]
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try:
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# Prepare the testfile
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@ -251,13 +232,7 @@ class OtherFileTests(unittest.TestCase):
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if next(f) != filler:
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self.fail, "Broken testfile"
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meth = getattr(f, methodname)
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try:
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meth(*args)
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except ValueError:
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pass
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else:
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self.fail("%s%r after next() didn't raise ValueError" %
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(methodname, args))
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meth(*args) # This simply shouldn't fail
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f.close()
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# Test to see if harmless (by accident) mixing of read* and
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@ -280,7 +255,7 @@ class OtherFileTests(unittest.TestCase):
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self.fail("readline() after next() with empty buffer "
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"failed. Got %r, expected %r" % (line, testline))
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testline = testlines.pop(0)
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buf = array("c", "\x00" * len(testline))
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buf = array("b", b"\x00" * len(testline))
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try:
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f.readinto(buf)
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except ValueError:
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|
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@ -365,11 +365,69 @@ fileio_readinto(PyFileIOObject *self, PyObject *args)
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return PyInt_FromLong(n);
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}
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#define DEFAULT_BUFFER_SIZE (8*1024)
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static PyObject *
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fileio_readall(PyFileIOObject *self)
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{
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PyObject *result;
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Py_ssize_t total = 0;
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int n;
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result = PyBytes_FromStringAndSize(NULL, DEFAULT_BUFFER_SIZE);
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if (result == NULL)
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return NULL;
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while (1) {
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Py_ssize_t newsize = total + DEFAULT_BUFFER_SIZE;
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if (PyBytes_GET_SIZE(result) < newsize) {
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if (PyBytes_Resize(result, newsize) < 0) {
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if (total == 0) {
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Py_DECREF(result);
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return NULL;
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}
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PyErr_Clear();
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break;
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}
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}
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Py_BEGIN_ALLOW_THREADS
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errno = 0;
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n = read(self->fd,
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PyBytes_AS_STRING(result) + total,
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newsize - total);
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Py_END_ALLOW_THREADS
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if (n == 0)
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break;
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if (n < 0) {
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if (total > 0)
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break;
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if (errno == EAGAIN) {
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Py_DECREF(result);
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Py_RETURN_NONE;
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}
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Py_DECREF(result);
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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total += n;
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}
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if (PyBytes_GET_SIZE(result) > total) {
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if (PyBytes_Resize(result, total) < 0) {
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/* This should never happen, but just in case */
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Py_DECREF(result);
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return NULL;
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}
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}
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return result;
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}
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static PyObject *
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fileio_read(PyFileIOObject *self, PyObject *args)
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{
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char *ptr;
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Py_ssize_t n, size;
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Py_ssize_t n;
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Py_ssize_t size = -1;
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PyObject *bytes;
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if (self->fd < 0)
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@ -377,13 +435,11 @@ fileio_read(PyFileIOObject *self, PyObject *args)
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if (!self->readable)
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return err_mode("reading");
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if (!PyArg_ParseTuple(args, "i", &size))
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if (!PyArg_ParseTuple(args, "|i", &size))
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return NULL;
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|
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if (size < 0) {
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PyErr_SetString(PyExc_ValueError,
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"negative read count");
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return NULL;
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return fileio_readall(self);
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}
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bytes = PyBytes_FromStringAndSize(NULL, size);
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|
|
@ -624,8 +680,14 @@ PyDoc_STRVAR(read_doc,
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"read(size: int) -> bytes. read at most size bytes, returned as bytes.\n"
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"\n"
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"Only makes one system call, so less data may be returned than requested\n"
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"In non-blocking mode, returns None if no data is available. On\n"
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"end-of-file, returns 0.");
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"In non-blocking mode, returns None if no data is available.\n"
|
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"On end-of-file, returns ''.");
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PyDoc_STRVAR(readall_doc,
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"readall() -> bytes. read all data from the file, returned as bytes.\n"
|
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"\n"
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"In non-blocking mode, returns as much as is immediately available,\n"
|
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"or None if no data is available. On end-of-file, returns ''.");
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PyDoc_STRVAR(write_doc,
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"write(b: bytes) -> int. Write bytes b to file, return number written.\n"
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|
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@ -680,6 +742,7 @@ PyDoc_STRVAR(writable_doc,
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|
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static PyMethodDef fileio_methods[] = {
|
||||
{"read", (PyCFunction)fileio_read, METH_VARARGS, read_doc},
|
||||
{"readall", (PyCFunction)fileio_readall, METH_NOARGS, readall_doc},
|
||||
{"readinto", (PyCFunction)fileio_readinto, METH_VARARGS, readinto_doc},
|
||||
{"write", (PyCFunction)fileio_write, METH_VARARGS, write_doc},
|
||||
{"seek", (PyCFunction)fileio_seek, METH_VARARGS, seek_doc},
|
||||
|
|
|
|||
Loading…
Reference in New Issue