author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`array` --- Efficient arrays of numeric values |
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=================================================== |
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.. module:: array |
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:synopsis: Space efficient arrays of uniformly typed numeric values. |
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.. index:: single: arrays |
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This module defines an object type which can compactly represent an array of |
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basic values: characters, integers, floating point numbers. Arrays are sequence |
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types and behave very much like lists, except that the type of objects stored in |
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them is constrained. The type is specified at object creation time by using a |
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:dfn:`type code`, which is a single character. The following type codes are |
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defined: |
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+-----------+----------------+-------------------+-----------------------+ |
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| Type code | C Type | Python Type | Minimum size in bytes | |
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+===========+================+===================+=======================+ |
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| ``'c'`` | char | character | 1 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'b'`` | signed char | int | 1 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'B'`` | unsigned char | int | 1 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'u'`` | Py_UNICODE | Unicode character | 2 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'h'`` | signed short | int | 2 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'H'`` | unsigned short | int | 2 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'i'`` | signed int | int | 2 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'I'`` | unsigned int | long | 2 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'l'`` | signed long | int | 4 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'L'`` | unsigned long | long | 4 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'f'`` | float | float | 4 | |
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+-----------+----------------+-------------------+-----------------------+ |
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| ``'d'`` | double | float | 8 | |
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+-----------+----------------+-------------------+-----------------------+ |
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The actual representation of values is determined by the machine architecture |
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(strictly speaking, by the C implementation). The actual size can be accessed |
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through the :attr:`itemsize` attribute. The values stored for ``'L'`` and |
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``'I'`` items will be represented as Python long integers when retrieved, |
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because Python's plain integer type cannot represent the full range of C's |
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unsigned (long) integers. |
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The module defines the following type: |
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.. function:: array(typecode[, initializer]) |
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Return a new array whose items are restricted by *typecode*, and initialized |
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from the optional *initializer* value, which must be a list, string, or iterable |
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over elements of the appropriate type. |
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.. versionchanged:: 2.4 |
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Formerly, only lists or strings were accepted. |
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If given a list or string, the initializer is passed to the new array's |
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:meth:`fromlist`, :meth:`fromstring`, or :meth:`fromunicode` method (see below) |
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to add initial items to the array. Otherwise, the iterable initializer is |
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passed to the :meth:`extend` method. |
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.. data:: ArrayType |
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Obsolete alias for :func:`array`. |
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Array objects support the ordinary sequence operations of indexing, slicing, |
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concatenation, and multiplication. When using slice assignment, the assigned |
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value must be an array object with the same type code; in all other cases, |
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:exc:`TypeError` is raised. Array objects also implement the buffer interface, |
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and may be used wherever buffer objects are supported. |
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The following data items and methods are also supported: |
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.. attribute:: array.typecode |
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The typecode character used to create the array. |
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.. attribute:: array.itemsize |
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The length in bytes of one array item in the internal representation. |
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.. method:: array.append(x) |
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Append a new item with value *x* to the end of the array. |
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.. method:: array.buffer_info() |
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Return a tuple ``(address, length)`` giving the current memory address and the |
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length in elements of the buffer used to hold array's contents. The size of the |
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memory buffer in bytes can be computed as ``array.buffer_info()[1] * |
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array.itemsize``. This is occasionally useful when working with low-level (and |
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inherently unsafe) I/O interfaces that require memory addresses, such as certain |
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:cfunc:`ioctl` operations. The returned numbers are valid as long as the array |
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exists and no length-changing operations are applied to it. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
108 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
109 |
.. note:: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
110 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
111 |
When using array objects from code written in C or C++ (the only way to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
112 |
effectively make use of this information), it makes more sense to use the buffer |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
interface supported by array objects. This method is maintained for backward |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
compatibility and should be avoided in new code. The buffer interface is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
documented in :ref:`bufferobjects`. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
116 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
117 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
.. method:: array.byteswap() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
120 |
"Byteswap" all items of the array. This is only supported for values which are |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
121 |
1, 2, 4, or 8 bytes in size; for other types of values, :exc:`RuntimeError` is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
122 |
raised. It is useful when reading data from a file written on a machine with a |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
123 |
different byte order. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
124 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
125 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
126 |
.. method:: array.count(x) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
127 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
128 |
Return the number of occurrences of *x* in the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
129 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
130 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
131 |
.. method:: array.extend(iterable) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
132 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
133 |
Append items from *iterable* to the end of the array. If *iterable* is another |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
134 |
array, it must have *exactly* the same type code; if not, :exc:`TypeError` will |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
135 |
be raised. If *iterable* is not an array, it must be iterable and its elements |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
136 |
must be the right type to be appended to the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
137 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
.. versionchanged:: 2.4 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
139 |
Formerly, the argument could only be another array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
140 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
141 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
.. method:: array.fromfile(f, n) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
Read *n* items (as machine values) from the file object *f* and append them to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
the end of the array. If less than *n* items are available, :exc:`EOFError` is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
raised, but the items that were available are still inserted into the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
147 |
*f* must be a real built-in file object; something else with a :meth:`read` |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
148 |
method won't do. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
149 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
.. method:: array.fromlist(list) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
Append items from the list. This is equivalent to ``for x in list: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
a.append(x)`` except that if there is a type error, the array is unchanged. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
155 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
156 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
157 |
.. method:: array.fromstring(s) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
158 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
159 |
Appends items from the string, interpreting the string as an array of machine |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
160 |
values (as if it had been read from a file using the :meth:`fromfile` method). |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
161 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
162 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
163 |
.. method:: array.fromunicode(s) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
164 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
165 |
Extends this array with data from the given unicode string. The array must |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
166 |
be a type ``'u'`` array; otherwise a :exc:`ValueError` is raised. Use |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
167 |
``array.fromstring(unicodestring.encode(enc))`` to append Unicode data to an |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
168 |
array of some other type. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
169 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
170 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
171 |
.. method:: array.index(x) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
172 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
173 |
Return the smallest *i* such that *i* is the index of the first occurrence of |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
174 |
*x* in the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
175 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
176 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
177 |
.. method:: array.insert(i, x) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
178 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
179 |
Insert a new item with value *x* in the array before position *i*. Negative |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
180 |
values are treated as being relative to the end of the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
181 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
182 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
183 |
.. method:: array.pop([i]) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
184 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
185 |
Removes the item with the index *i* from the array and returns it. The optional |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
186 |
argument defaults to ``-1``, so that by default the last item is removed and |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
187 |
returned. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
188 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
189 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
190 |
.. method:: array.read(f, n) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
191 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
192 |
.. deprecated:: 1.5.1 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
193 |
Use the :meth:`fromfile` method. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
194 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
195 |
Read *n* items (as machine values) from the file object *f* and append them to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
196 |
the end of the array. If less than *n* items are available, :exc:`EOFError` is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
197 |
raised, but the items that were available are still inserted into the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
198 |
*f* must be a real built-in file object; something else with a :meth:`read` |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
199 |
method won't do. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
200 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
201 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
202 |
.. method:: array.remove(x) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
203 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
204 |
Remove the first occurrence of *x* from the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
205 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
206 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
207 |
.. method:: array.reverse() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
208 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
209 |
Reverse the order of the items in the array. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
210 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
211 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
212 |
.. method:: array.tofile(f) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
213 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
214 |
Write all items (as machine values) to the file object *f*. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
215 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
216 |
|
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.. method:: array.tolist() |
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Convert the array to an ordinary list with the same items. |
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.. method:: array.tostring() |
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Convert the array to an array of machine values and return the string |
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representation (the same sequence of bytes that would be written to a file by |
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the :meth:`tofile` method.) |
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.. method:: array.tounicode() |
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Convert the array to a unicode string. The array must be a type ``'u'`` array; |
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otherwise a :exc:`ValueError` is raised. Use ``array.tostring().decode(enc)`` to |
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obtain a unicode string from an array of some other type. |
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.. method:: array.write(f) |
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.. deprecated:: 1.5.1 |
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Use the :meth:`tofile` method. |
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Write all items (as machine values) to the file object *f*. |
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When an array object is printed or converted to a string, it is represented as |
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``array(typecode, initializer)``. The *initializer* is omitted if the array is |
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empty, otherwise it is a string if the *typecode* is ``'c'``, otherwise it is a |
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list of numbers. The string is guaranteed to be able to be converted back to an |
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array with the same type and value using :func:`eval`, so long as the |
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:func:`array` function has been imported using ``from array import array``. |
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Examples:: |
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array('l') |
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array('c', 'hello world') |
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array('u', u'hello \u2641') |
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array('l', [1, 2, 3, 4, 5]) |
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array('d', [1.0, 2.0, 3.14]) |
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.. seealso:: |
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Module :mod:`struct` |
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Packing and unpacking of heterogeneous binary data. |
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Module :mod:`xdrlib` |
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Packing and unpacking of External Data Representation (XDR) data as used in some |
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remote procedure call systems. |
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`The Numerical Python Manual <http://numpy.sourceforge.net/numdoc/HTML/numdoc.htm>`_ |
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The Numeric Python extension (NumPy) defines another array type; see |
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http://numpy.sourceforge.net/ for further information about Numerical Python. |
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(A PDF version of the NumPy manual is available at |
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http://numpy.sourceforge.net/numdoc/numdoc.pdf). |
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