# `array` — Efficient arrays of numeric values

This module defines an object type which can compactly represent an array of basic values: characters, integers, floating-point numbers, complex numbers. Arrays are mutable sequence types and behave very much like lists, except that the type of objects stored in them is constrained. The type is specified at object creation time by using a type code. The following type codes are defined:

kod typu | typ języka C | typ Pythona | minimalny rozmiar w bajtach | notatki
--- | --- | --- | --- | ---
`'b'` | typ znakowy z bitem znaku | int | 1 |
`'B'` | nieoznaczony typ znakowy | int | 1 |
`'u'` | wchar_t | znak Unicode | 2 | (1)
`'w'` | Py_UCS4 | znak Unicode | 4 | (2)
`'h'` | oznaczony typ krótki | int | 2 |
`'H'` | nieoznaczony typ krótki | int | 2 |
`'i'` | oznaczony typ int | int | 2 |
`'I'` | nieoznaczony typ int | int | 2 |
`'I'` | oznaczony typ długi | int | 4 |
`'L'` | nieoznaczony typ długi | int | 4 |
`'q'` | signed long long | int | 8 |
`'Q'` | unsigned long long | int | 8 |
`'e'` | _Float16 | float | 2 | (3)
`'f'` | float | float | 4 |
`'d'` | typ (double) zmiennoprzecinkowy podwójnej precyzji | float | 8 |
`'Zf'` | float complex | complex | 8 | (4)
`'Zd'` | double complex | complex | 16 | (4)

Uwagi:

1. It can be 16 bits or 32 bits depending on the platform.

   Zmienione w wersji 3.9: `array('u')` now uses `wchar_t` as C type instead of deprecated `Py_UNICODE`. This change doesn’t affect its behavior because `Py_UNICODE` is alias of `wchar_t` since Python 3.3.

   Zdezaprobowane w wersji 3.3, usunięte w wersji 3.16: Please migrate to `'w'` typecode.

2. Dodane w wersji 3.13.

3. The IEEE 754 binary16 „half precision” type was introduced in the 2008 revision of the IEEE 754 standard. This type is not widely supported by C compilers. It’s available as _Float16 type, if the compiler supports the Annex H of the C23 standard.

   Dodane w wersji 3.15.

4. Complex types (`Zf` and `Zd`) are available unconditionally, regardless on support for complex types (the Annex G of the C11 standard) by the C compiler. As specified in the C11 standard, each complex type is represented by a two-element C array containing, respectively, the real and imaginary parts.

   Dodane w wersji 3.15.

Zobacz także

The ctypes and struct modules, as well as third-party modules like numpy, use similar – but slightly different – type codes.

The actual representation of values is determined by the machine architecture (strictly speaking, by the C implementation). The actual size can be accessed through the `array.itemsize` attribute.

The module defines the following item:

array.typecodes

  A tuple with all available type codes.

  Zmienione w wersji 3.15: The type changed from `str` to `tuple`.

Moduł definiuje następujący typ:

class array.array(typecode[, initializer])

  A new array whose items are restricted by typecode, and initialized from the optional initializer value, which must be a `bytes` or `bytearray` object, a Unicode string, or iterable over elements of the appropriate type.

  If given a `bytes` or `bytearray` object, the initializer is passed to the new array’s `frombytes()` method; if given a Unicode string, the initializer is passed to the `fromunicode()` method; otherwise, the initializer’s iterator is passed to the `extend()` method to add initial items to the array.

  Array objects support the ordinary mutable sequence operations of indexing, slicing, concatenation, and multiplication. When using slice assignment, the assigned value must be an array object with the same type code; in all other cases, `TypeError` is raised. Array objects also implement the buffer interface, and may be used wherever bytes-like objects are supported.

  Raises an auditing event `array.__new__` with arguments `typecode`, `initializer`.

  typecode

    Znak kodujący typ używany do tworzenia tabeli.

  itemsize

    długość w bajtach (kęsach) jednego elementu tabeli w wewnętrznym przedstawieniu.

  append(value, /)

    Append a new item with the specified value to the end of the array.

  buffer_info()

    Return a tuple `(address, length)` giving the current memory address and the length in elements of the buffer used to hold array’s contents. The size of the memory buffer in bytes can be computed as `array.buffer_info()[1] * array.itemsize`. This is occasionally useful when working with low-level (and inherently unsafe) I/O interfaces that require memory addresses, such as certain `ioctl()` operations. The returned numbers are valid as long as the array exists and no length-changing operations are applied to it.

    Informacja

    Gdy używa się tablic z kodu napisanego w języku C lub C++ (jedyna droga aby efektywnie skorzystać z tej informacji), to jest to bardziej sensowne aby użyć sprzęgu przestrzeni wymiany który jest wspierany przez przedmioty tablicowe. Ten sposób postępowania jest utrzymywany dla wstecznej zgodności i powinien być pomijany w nowym kodzie. Sprzęg przestrzeni wymiany jest opisany w Buffer Protocol.

  byteswap()

    „Byteswap” all items of the array. This is only supported for values which are 1, 2, 4, 8 or 16 bytes in size; for other types of values, `RuntimeError` is raised. It is useful when reading data from a file written on a machine with a different byte order. Note, that for complex types the order of components (the real part, followed by imaginary part) is preserved.

  count(value, /)

    Return the number of occurrences of value in the array.

  extend(iterable, /)

    Przyklej elementy z przedmiotu iterowalnego na koniec tablicy. Jeśli iterowalny jest kolejną tablicą, musi mieć dokładnie ten sam typ kodu; Jeśli nie, wyjątek `TypeError` będzie zgłoszony. Jeśli iterowalny nie jest tablicą, musi być iterowalny i jego elementy muszą być właściwego typu aby mogły być doklejone do tablicy.

  frombytes(buffer, /)

    Appends items from the bytes-like object, interpreting its content as an array of machine values (as if it had been read from a file using the `fromfile()` method).

    Dodane w wersji 3.2: `fromstring()` is renamed to `frombytes()` for clarity.

  fromfile(f, n, /)

    Read n items (as machine values) from the file object f and append them to the end of the array. If less than n items are available, `EOFError` is raised, but the items that were available are still inserted into the array.

  fromlist(list, /)

    Doklej elementy z listy. To jest równoważne z `for x in list: a.append(x)` z wyjątkiem tego, że jeśli wystąpi błąd typu, tablica pozostanie niezmieniona.

  fromunicode(ustr, /)

    Extends this array with data from the given Unicode string. The array must have type code `'u'` or `'w'`; otherwise a `ValueError` is raised. Use `array.frombytes(unicodestring.encode(enc))` to append Unicode data to an array of some other type.

  index(value[, start[, stop]])

    Return the smallest i such that i is the index of the first occurrence of value in the array. The optional arguments start and stop can be specified to search for value within a subsection of the array. Raise `ValueError` if value is not found.

    Zmienione w wersji 3.10: Added optional start and stop parameters.

  insert(index, value, /)

    Insert a new item value in the array before position index. Negative values are treated as being relative to the end of the array.

  pop(index=-1, /)

    Usuwa element o indeksie i z tablicy i zwraca go. Opcjonalny parametr domyślnie jest `-1`, tak aby domyślnie ostatni element był usuwany i zwracany.

  remove(value, /)

    Remove the first occurrence of value from the array.

  clear()

    Remove all elements from the array.

    Dodane w wersji 3.13.

  reverse()

    Odwróć kolejność elementów w tabeli.

  tobytes()

    Convert the array to an array of machine values and return the bytes representation (the same sequence of bytes that would be written to a file by the `tofile()` method.)

    Dodane w wersji 3.2: `tostring()` is renamed to `tobytes()` for clarity.

  tofile(f, /)

    Write all items (as machine values) to the file object f.

  tolist()

    Zamień tabelę na zwykłą listę o tych samych elementach.

  tounicode()

    Convert the array to a Unicode string. The array must have a type `'u'` or `'w'`; otherwise a `ValueError` is raised. Use `array.tobytes().decode(enc)` to obtain a Unicode string from an array of some other type.

The string representation of array objects has the form `array(typecode, initializer)`. The initializer is omitted if the array is empty, otherwise it is a Unicode string if the typecode is `'u'` or `'w'`, otherwise it is a list of numbers. The string representation is guaranteed to be able to be converted back to an array with the same type and value using `eval()`, so long as the `array` class has been imported using `from array import array`. Variables `inf` and `nan` must also be defined if it contains corresponding floating-point values. Examples:

    array('l')
    array('w', 'hello \u2641')
    array('l', [1, 2, 3, 4, 5])
    array('d', [1.0, 2.0, 3.14, -inf, nan])

Zobacz także

Module `struct`

  Pakowanie i odpakowanie jednorodnych danych binarnych.

NumPy

  The NumPy package defines another array type.