The PyArg_ParseTuple() function is declared as follows:
int PyArg_ParseTuple(PyObject *arg, char *format,...);
The arg argument must be a tuple object containing an argument list passed from Python to a C function. The format argument must be a format string, whose syntax is explained below. The remaining arguments must be addresses of variables whose type is determined by the format string. For the conversion to succeed, the arg object must match the format and the format must be exhausted.
Note that while PyArg_ParseTuple() checks that the Python arguments have the required types, it cannot check the validity of the addresses of C variables passed to the call: if you make mistakes there, your code will probably crash or at least overwrite random bits in memory. So be careful!
A format string consists of zero or more ``format units''. A format unit describes one Python object; it is usually a single character or a parenthesized sequence of format units. With a few exceptions, a format unit that is not a parenthesized sequence normally corresponds to a single address argument to PyArg_ParseTuple(). In the following description, the quoted form is the format unit; the entry in (round) parentheses is the Python object type that matches the format unit; and the entry in [square] brackets is the type of the C variable(s) whose address should be passed. (Use the "&"operator to pass a variable's address.)
Note that any Python object references which are provided to the caller are borrowed references; do not decrement their reference count!
None
) [char *]None
, in which
case the C pointer is set to NULL.
None
or any read buffer compatible object)
[char *, int]
The variant reads one C variable and stores into two C variables, the first one a pointer to an encoding name string (encoding), and the second a pointer to a pointer to a character buffer (**buffer, the buffer used for storing the encoded data).
The encoding name must map to a registered codec. If set to NULL, the default encoding is used.
PyArg_ParseTuple() will allocate a buffer of the needed size using PyMem_NEW(), copy the encoded data into this buffer and adjust *buffer to reference the newly allocated storage. The caller is responsible for calling PyMem_Free() to free the allocated buffer after usage.
The encoding name must map to a registered codec. If set to NULL, the default encoding is used.
There are two modes of operation:
If *buffer points a NULL pointer, PyArg_ParseTuple() will allocate a buffer of the needed size using PyMem_NEW(), copy the encoded data into this buffer and adjust *buffer to reference the newly allocated storage. The caller is responsible for calling PyMem_Free() to free the allocated buffer after usage.
If *buffer points to a non-NULL pointer (an already allocated buffer), PyArg_ParseTuple() will use this location as buffer and interpret *buffer_length as buffer size. It will then copy the encoded data into the buffer and 0-terminate it. Buffer overflow is signalled with an exception.
In both cases, *buffer_length is set to the length of the encoded data without the trailing 0-byte.
status =
converter(
object, address);
where object is the Python object to be converted and
address is the void * argument that was passed to
PyArg_ConvertTuple(). The returned status should be
1
for a successful conversion and 0
if the conversion
has failed. When the conversion fails, the converter function
should raise an exception.
Note: Prior to Python version 1.5.2, this format specifier only accepted a tuple containing the individual parameters, not an arbitrary sequence. Code which previously caused TypeError to be raised here may now proceed without an exception. This is not expected to be a problem for existing code.
It is possible to pass Python long integers where integers are requested; however no proper range checking is done -- the most significant bits are silently truncated when the receiving field is too small to receive the value (actually, the semantics are inherited from downcasts in C -- your mileage may vary).
A few other characters have a meaning in a format string. These may not occur inside nested parentheses. They are:
Some example calls:
int ok; int i, j; long k, l; char *s; int size; ok = PyArg_ParseTuple(args, ""); /* No arguments */ /* Python call: f() */
ok = PyArg_ParseTuple(args, "s", &s); /* A string */ /* Possible Python call: f('whoops!') */
ok = PyArg_ParseTuple(args, "lls", &k, &l, &s); /* Two longs and a string */ /* Possible Python call: f(1, 2, 'three') */
ok = PyArg_ParseTuple(args, "(ii)s#", &i, &j, &s, &size); /* A pair of ints and a string, whose size is also returned */ /* Possible Python call: f((1, 2), 'three') */
{ char *file; char *mode = "r"; int bufsize = 0; ok = PyArg_ParseTuple(args, "s|si", &file, &mode, &bufsize); /* A string, and optionally another string and an integer */ /* Possible Python calls: f('spam') f('spam', 'w') f('spam', 'wb', 100000) */ }
{ int left, top, right, bottom, h, v; ok = PyArg_ParseTuple(args, "((ii)(ii))(ii)", &left, &top, &right, &bottom, &h, &v); /* A rectangle and a point */ /* Possible Python call: f(((0, 0), (400, 300)), (10, 10)) */ }
{ Py_complex c; ok = PyArg_ParseTuple(args, "D:myfunction", &c); /* a complex, also providing a function name for errors */ /* Possible Python call: myfunction(1+2j) */ }
See About this document... for information on suggesting changes.
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