author | bugtracker-ml@nttdocomo.com |
Tue, 06 Apr 2010 17:00:22 +0100 | |
changeset 56 | f24810eebc6b |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _sequence: |
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Sequence Protocol |
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================= |
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.. cfunction:: int PySequence_Check(PyObject *o) |
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Return ``1`` if the object provides sequence protocol, and ``0`` otherwise. |
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This function always succeeds. |
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.. cfunction:: Py_ssize_t PySequence_Size(PyObject *o) |
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.. index:: builtin: len |
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Returns the number of objects in sequence *o* on success, and ``-1`` on failure. |
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For objects that do not provide sequence protocol, this is equivalent to the |
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Python expression ``len(o)``. |
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.. cfunction:: Py_ssize_t PySequence_Length(PyObject *o) |
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Alternate name for :cfunc:`PySequence_Size`. |
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.. cfunction:: PyObject* PySequence_Concat(PyObject *o1, PyObject *o2) |
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Return the concatenation 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* PySequence_Repeat(PyObject *o, Py_ssize_t count) |
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Return the result of repeating sequence object *o* *count* times, or *NULL* on |
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failure. This is the equivalent of the Python expression ``o * count``. |
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.. cfunction:: PyObject* PySequence_InPlaceConcat(PyObject *o1, PyObject *o2) |
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Return the concatenation of *o1* and *o2* on success, and *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 expression ``o1 += o2``. |
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.. cfunction:: PyObject* PySequence_InPlaceRepeat(PyObject *o, Py_ssize_t count) |
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Return the result of repeating sequence object *o* *count* times, or *NULL* on |
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failure. The operation is done *in-place* when *o* supports it. This is the |
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equivalent of the Python expression ``o *= count``. |
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.. cfunction:: PyObject* PySequence_GetItem(PyObject *o, Py_ssize_t i) |
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Return the *i*th element of *o*, or *NULL* on failure. This is the equivalent of |
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the Python expression ``o[i]``. |
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.. cfunction:: PyObject* PySequence_GetSlice(PyObject *o, Py_ssize_t i1, Py_ssize_t i2) |
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Return the slice of sequence object *o* between *i1* and *i2*, or *NULL* on |
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failure. This is the equivalent of the Python expression ``o[i1:i2]``. |
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.. cfunction:: int PySequence_SetItem(PyObject *o, Py_ssize_t i, PyObject *v) |
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Assign object *v* to the *i*th element of *o*. Returns ``-1`` on failure. This |
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is the equivalent of the Python statement ``o[i] = v``. This function *does |
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not* steal a reference to *v*. |
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.. cfunction:: int PySequence_DelItem(PyObject *o, Py_ssize_t i) |
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Delete the *i*th element of object *o*. Returns ``-1`` on failure. This is the |
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equivalent of the Python statement ``del o[i]``. |
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.. cfunction:: int PySequence_SetSlice(PyObject *o, Py_ssize_t i1, Py_ssize_t i2, PyObject *v) |
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Assign the sequence object *v* to the slice in sequence object *o* from *i1* to |
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*i2*. This is the equivalent of the Python statement ``o[i1:i2] = v``. |
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.. cfunction:: int PySequence_DelSlice(PyObject *o, Py_ssize_t i1, Py_ssize_t i2) |
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Delete the slice in sequence object *o* from *i1* to *i2*. Returns ``-1`` on |
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failure. This is the equivalent of the Python statement ``del o[i1:i2]``. |
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.. cfunction:: Py_ssize_t PySequence_Count(PyObject *o, PyObject *value) |
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Return the number of occurrences of *value* in *o*, that is, return the number |
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of keys for which ``o[key] == value``. On failure, return ``-1``. This is |
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equivalent to the Python expression ``o.count(value)``. |
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.. cfunction:: int PySequence_Contains(PyObject *o, PyObject *value) |
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Determine if *o* contains *value*. If an item in *o* is equal to *value*, |
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return ``1``, otherwise return ``0``. On error, return ``-1``. This is |
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equivalent to the Python expression ``value in o``. |
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.. cfunction:: Py_ssize_t PySequence_Index(PyObject *o, PyObject *value) |
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107 |
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Return the first index *i* for which ``o[i] == value``. On error, return |
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``-1``. This is equivalent to the Python expression ``o.index(value)``. |
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110 |
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111 |
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.. cfunction:: PyObject* PySequence_List(PyObject *o) |
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113 |
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Return a list object with the same contents as the arbitrary sequence *o*. The |
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returned list is guaranteed to be new. |
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116 |
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117 |
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.. cfunction:: PyObject* PySequence_Tuple(PyObject *o) |
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119 |
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.. index:: builtin: tuple |
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121 |
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Return a tuple object with the same contents as the arbitrary sequence *o* or |
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*NULL* on failure. If *o* is a tuple, a new reference will be returned, |
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otherwise a tuple will be constructed with the appropriate contents. This is |
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equivalent to the Python expression ``tuple(o)``. |
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126 |
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.. cfunction:: PyObject* PySequence_Fast(PyObject *o, const char *m) |
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Returns the sequence *o* as a tuple, unless it is already a tuple or list, in |
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which case *o* is returned. Use :cfunc:`PySequence_Fast_GET_ITEM` to access the |
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members of the result. Returns *NULL* on failure. If the object is not a |
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sequence, raises :exc:`TypeError` with *m* as the message text. |
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.. cfunction:: PyObject* PySequence_Fast_GET_ITEM(PyObject *o, Py_ssize_t i) |
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Return the *i*th element of *o*, assuming that *o* was returned by |
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:cfunc:`PySequence_Fast`, *o* is not *NULL*, and that *i* is within bounds. |
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140 |
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141 |
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.. cfunction:: PyObject** PySequence_Fast_ITEMS(PyObject *o) |
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Return the underlying array of PyObject pointers. Assumes that *o* was returned |
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by :cfunc:`PySequence_Fast` and *o* is not *NULL*. |
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146 |
|
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Note, if a list gets resized, the reallocation may relocate the items array. |
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So, only use the underlying array pointer in contexts where the sequence |
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cannot change. |
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150 |
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.. versionadded:: 2.4 |
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.. cfunction:: PyObject* PySequence_ITEM(PyObject *o, Py_ssize_t i) |
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Return the *i*th element of *o* or *NULL* on failure. Macro form of |
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:cfunc:`PySequence_GetItem` but without checking that |
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:cfunc:`PySequence_Check(o)` is true and without adjustment for negative |
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indices. |
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160 |
|
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.. versionadded:: 2.3 |
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.. cfunction:: Py_ssize_t PySequence_Fast_GET_SIZE(PyObject *o) |
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Returns the length of *o*, assuming that *o* was returned by |
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:cfunc:`PySequence_Fast` and that *o* is not *NULL*. The size can also be |
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gotten by calling :cfunc:`PySequence_Size` on *o*, but |
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:cfunc:`PySequence_Fast_GET_SIZE` is faster because it can assume *o* is a list |
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or tuple. |