mirror of https://github.com/python/cpython
289 lines
10 KiB
ReStructuredText
289 lines
10 KiB
ReStructuredText
.. highlightlang:: c
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.. _number:
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Number Protocol
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===============
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.. cfunction:: int PyNumber_Check(PyObject *o)
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Returns ``1`` if the object *o* provides numeric protocols, and false otherwise.
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This function always succeeds.
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.. cfunction:: PyObject* PyNumber_Add(PyObject *o1, PyObject *o2)
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Returns the result of adding *o1* and *o2*, or *NULL* on failure. This is the
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equivalent of the Python expression ``o1 + o2``.
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.. cfunction:: PyObject* PyNumber_Subtract(PyObject *o1, PyObject *o2)
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Returns the result of subtracting *o2* from *o1*, or *NULL* on failure. This is
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the equivalent of the Python expression ``o1 - o2``.
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.. cfunction:: PyObject* PyNumber_Multiply(PyObject *o1, PyObject *o2)
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Returns the result of multiplying *o1* and *o2*, or *NULL* on failure. This is
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the equivalent of the Python expression ``o1 * o2``.
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.. cfunction:: PyObject* PyNumber_Divide(PyObject *o1, PyObject *o2)
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Returns the result of dividing *o1* by *o2*, or *NULL* on failure. This is the
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equivalent of the Python expression ``o1 / o2``.
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.. cfunction:: PyObject* PyNumber_FloorDivide(PyObject *o1, PyObject *o2)
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Return the floor of *o1* divided by *o2*, or *NULL* on failure. This is
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equivalent to the "classic" division of integers.
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.. cfunction:: PyObject* PyNumber_TrueDivide(PyObject *o1, PyObject *o2)
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Return a reasonable approximation for the mathematical value of *o1* divided by
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*o2*, or *NULL* on failure. The return value is "approximate" because binary
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floating point numbers are approximate; it is not possible to represent all real
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numbers in base two. This function can return a floating point value when
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passed two integers.
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.. cfunction:: PyObject* PyNumber_Remainder(PyObject *o1, PyObject *o2)
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Returns the remainder of dividing *o1* by *o2*, or *NULL* on failure. This is
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the equivalent of the Python expression ``o1 % o2``.
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.. cfunction:: PyObject* PyNumber_Divmod(PyObject *o1, PyObject *o2)
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.. index:: builtin: divmod
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See the built-in function :func:`divmod`. Returns *NULL* on failure. This is
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the equivalent of the Python expression ``divmod(o1, o2)``.
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.. cfunction:: PyObject* PyNumber_Power(PyObject *o1, PyObject *o2, PyObject *o3)
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.. index:: builtin: pow
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See the built-in function :func:`pow`. Returns *NULL* on failure. This is the
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equivalent of the Python expression ``pow(o1, o2, o3)``, where *o3* is optional.
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If *o3* is to be ignored, pass :cdata:`Py_None` in its place (passing *NULL* for
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*o3* would cause an illegal memory access).
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.. cfunction:: PyObject* PyNumber_Negative(PyObject *o)
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Returns the negation of *o* on success, or *NULL* on failure. This is the
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equivalent of the Python expression ``-o``.
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.. cfunction:: PyObject* PyNumber_Positive(PyObject *o)
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Returns *o* on success, or *NULL* on failure. This is the equivalent of the
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Python expression ``+o``.
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.. cfunction:: PyObject* PyNumber_Absolute(PyObject *o)
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.. index:: builtin: abs
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Returns the absolute value of *o*, or *NULL* on failure. This is the equivalent
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of the Python expression ``abs(o)``.
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.. cfunction:: PyObject* PyNumber_Invert(PyObject *o)
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Returns the bitwise negation of *o* on success, or *NULL* on failure. This is
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the equivalent of the Python expression ``~o``.
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.. cfunction:: PyObject* PyNumber_Lshift(PyObject *o1, PyObject *o2)
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Returns the result of left shifting *o1* by *o2* on success, or *NULL* on
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failure. This is the equivalent of the Python expression ``o1 << o2``.
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.. cfunction:: PyObject* PyNumber_Rshift(PyObject *o1, PyObject *o2)
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Returns the result of right shifting *o1* by *o2* on success, or *NULL* on
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failure. This is the equivalent of the Python expression ``o1 >> o2``.
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.. cfunction:: PyObject* PyNumber_And(PyObject *o1, PyObject *o2)
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Returns the "bitwise and" of *o1* and *o2* on success and *NULL* on failure.
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This is the equivalent of the Python expression ``o1 & o2``.
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.. cfunction:: PyObject* PyNumber_Xor(PyObject *o1, PyObject *o2)
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Returns the "bitwise exclusive or" of *o1* by *o2* on success, or *NULL* on
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failure. This is the equivalent of the Python expression ``o1 ^ o2``.
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.. cfunction:: PyObject* PyNumber_Or(PyObject *o1, PyObject *o2)
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Returns the "bitwise or" of *o1* and *o2* on success, or *NULL* on failure.
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This is the equivalent of the Python expression ``o1 | o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceAdd(PyObject *o1, PyObject *o2)
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Returns the result of adding *o1* and *o2*, or *NULL* on failure. The operation
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is done *in-place* when *o1* supports it. This is the equivalent of the Python
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statement ``o1 += o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceSubtract(PyObject *o1, PyObject *o2)
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Returns the result of subtracting *o2* from *o1*, or *NULL* on failure. The
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operation is done *in-place* when *o1* supports it. This is the equivalent of
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the Python statement ``o1 -= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceMultiply(PyObject *o1, PyObject *o2)
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Returns the result of multiplying *o1* and *o2*, or *NULL* on failure. The
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operation is done *in-place* when *o1* supports it. This is the equivalent of
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the Python statement ``o1 *= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceDivide(PyObject *o1, PyObject *o2)
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Returns the result of dividing *o1* by *o2*, or *NULL* on failure. The
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operation is done *in-place* when *o1* supports it. This is the equivalent of
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the Python statement ``o1 /= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceFloorDivide(PyObject *o1, PyObject *o2)
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Returns the mathematical floor of dividing *o1* by *o2*, or *NULL* on failure.
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The operation is done *in-place* when *o1* supports it. This is the equivalent
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of the Python statement ``o1 //= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceTrueDivide(PyObject *o1, PyObject *o2)
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Return a reasonable approximation for the mathematical value of *o1* divided by
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*o2*, or *NULL* on failure. The return value is "approximate" because binary
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floating point numbers are approximate; it is not possible to represent all real
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numbers in base two. This function can return a floating point value when
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passed two integers. The operation is done *in-place* when *o1* supports it.
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.. cfunction:: PyObject* PyNumber_InPlaceRemainder(PyObject *o1, PyObject *o2)
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Returns the remainder of dividing *o1* by *o2*, or *NULL* on failure. The
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operation is done *in-place* when *o1* supports it. This is the equivalent of
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the Python statement ``o1 %= o2``.
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.. cfunction:: PyObject* PyNumber_InPlacePower(PyObject *o1, PyObject *o2, PyObject *o3)
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.. index:: builtin: pow
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See the built-in function :func:`pow`. Returns *NULL* on failure. The operation
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is done *in-place* when *o1* supports it. This is the equivalent of the Python
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statement ``o1 **= o2`` when o3 is :cdata:`Py_None`, or an in-place variant of
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``pow(o1, o2, o3)`` otherwise. If *o3* is to be ignored, pass :cdata:`Py_None`
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in its place (passing *NULL* for *o3* would cause an illegal memory access).
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.. cfunction:: PyObject* PyNumber_InPlaceLshift(PyObject *o1, PyObject *o2)
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Returns the result of left shifting *o1* by *o2* on success, or *NULL* on
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failure. The operation is done *in-place* when *o1* supports it. This is the
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equivalent of the Python statement ``o1 <<= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceRshift(PyObject *o1, PyObject *o2)
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Returns the result of right shifting *o1* by *o2* on success, or *NULL* on
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failure. The operation is done *in-place* when *o1* supports it. This is the
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equivalent of the Python statement ``o1 >>= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceAnd(PyObject *o1, PyObject *o2)
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Returns the "bitwise and" of *o1* and *o2* on success and *NULL* on failure. The
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operation is done *in-place* when *o1* supports it. This is the equivalent of
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the Python statement ``o1 &= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceXor(PyObject *o1, PyObject *o2)
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Returns the "bitwise exclusive or" of *o1* by *o2* on success, or *NULL* on
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failure. The operation is done *in-place* when *o1* supports it. This is the
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equivalent of the Python statement ``o1 ^= o2``.
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.. cfunction:: PyObject* PyNumber_InPlaceOr(PyObject *o1, PyObject *o2)
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Returns the "bitwise or" of *o1* and *o2* on success, or *NULL* on failure. The
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operation is done *in-place* when *o1* supports it. This is the equivalent of
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the Python statement ``o1 |= o2``.
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.. cfunction:: PyObject* PyNumber_Int(PyObject *o)
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Returns the *o* converted to an integer object on success, or *NULL* on
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failure. This is the equivalent of the Python expression ``int(o)``.
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.. note::
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This function is defined in the transitional :file:`intobject.h`
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header file. It will be removed completely in Python 3.1. Use
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the :cfunc:`PyNumber_Long` function instead.
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.. cfunction:: PyObject* PyNumber_Long(PyObject *o)
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.. index:: builtin: int
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Returns the *o* converted to an integer object on success, or *NULL* on
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failure. This is the equivalent of the Python expression ``int(o)``.
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.. cfunction:: PyObject* PyNumber_Float(PyObject *o)
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.. index:: builtin: float
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Returns the *o* converted to a float object on success, or *NULL* on failure.
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This is the equivalent of the Python expression ``float(o)``.
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.. cfunction:: PyObject* PyNumber_Index(PyObject *o)
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Returns the *o* converted to a Python int on success or *NULL* with a
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:exc:`TypeError` exception raised on failure.
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.. cfunction:: PyObject* PyNumber_ToBase(PyObject *n, int base)
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Returns the the integer *n* converted to *base* as a string with a base
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marker of ``'0b'``, ``'0o'``, or ``'0x'`` if appended applicable. When
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*base* is not 2, 8, 10, or 16, the format is ``'x#num'`` where x is the
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base. If *n* is not an int object, it is converted with
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:cfunc:`PyNumber_Index` first.
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.. cfunction:: Py_ssize_t PyNumber_AsSsize_t(PyObject *o, PyObject *exc)
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Returns *o* converted to a Py_ssize_t value if *o* can be interpreted as an
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integer. If *o* can be converted to a Python int but the attempt to
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convert to a Py_ssize_t value would raise an :exc:`OverflowError`, then the
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*exc* argument is the type of exception that will be raised (usually
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:exc:`IndexError` or :exc:`OverflowError`). If *exc* is *NULL*, then the
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exception is cleared and the value is clipped to *PY_SSIZE_T_MIN* for a negative
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integer or *PY_SSIZE_T_MAX* for a positive integer.
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.. cfunction:: int PyIndex_Check(PyObject *o)
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Returns True if *o* is an index integer (has the nb_index slot of the
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tp_as_number structure filled in).
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