8.6. 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. Arrays are 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, which is a single character. The following type codes are defined:

Type code	C Type	Python Type	Minimum size in bytes
'c'	char	character	1
'b'	signed char	int	1
'B'	unsigned char	int	1
'u'	Py_UNICODE	Unicode character	2
'h'	signed short	int	2
'H'	unsigned short	int	2
'i'	signed int	int	2
'I'	unsigned int	long	2
'l'	signed long	int	4
'L'	unsigned long	long	4
'f'	float	float	4
'd'	double	float	8

In CPython, the actual representation of values is determined by the machine architecture (strictly speaking, by the C implementation). Jython differs a bit because the array module is an implementation of jarray.

The module defines the following type:

array.array(typecode[, initializer])

Return a new array whose items are restricted by typecode, and initialized from the optional initializer value, which must be a list, string, or iterable over elements of the appropriate type.

Changed in version 2.4: Formerly, only lists or strings were accepted.

If given a list or string, the initializer is passed to the new array’s fromlist(), fromstring(), or fromunicode() method (see below) to add initial items to the array. Otherwise, the iterable initializer is passed to the extend() method.

The following data items and methods are also supported:

array.typecode

The typecode character used to create the array.

array.itemsize

The length in bytes of one array item in the internal representation.

array.append(x)

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

array.byteswap()

“Byteswap” all items of the array. This is only supported for values which are 1, 2, 4, or 8 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.

array.count(x)

Return the number of occurrences of x in the array.

array.extend(iterable)

Append items from iterable to the end of the array. If iterable is another array, it must have exactly the same type code; if not, TypeError will be raised. If iterable is not an array, it must be iterable and its elements must be the right type to be appended to the array.

Changed in version 2.4: Formerly, the argument could only be another array.

array.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. f must be a real built-in file object; something else with a read() method won’t do.

array.fromlist(list)

Append items from the list. This is equivalent to for x in list: a.append(x) except that if there is a type error, the array is unchanged.

array.fromstring(s)

Appends items from the string, interpreting the string as an array of machine values (as if it had been read from a file using the fromfile() method).

array.fromunicode(s)

Extends this array with data from the given unicode string. The array must be a type 'u' array; otherwise a ValueError is raised. Use array.fromstring(unicodestring.encode(enc)) to append Unicode data to an array of some other type.

array.index(x)

Return the smallest i such that i is the index of the first occurrence of x in the array.

array.insert(i, x)

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

array.pop([i])

Removes the item with the index i from the array and returns it. The optional argument defaults to -1, so that by default the last item is removed and returned.

array.remove(x)

Remove the first occurrence of x from the array.

array.reverse()

Reverse the order of the items in the array.

array.tofile(f)

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

array.tolist()

Convert the array to an ordinary list with the same items.

array.tostring()

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

array.tounicode()

Convert the array to a unicode string. The array must be a type 'u' array; otherwise a ValueError is raised. Use array.tostring().decode(enc) to obtain a unicode string from an array of some other type.

array.write(f)

Deprecated since version 1.5.1: Use the tofile() method.

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

When an array object is printed or converted to a string, it is represented as array(typecode, initializer). The initializer is omitted if the array is empty, otherwise it is a string if the typecode is 'c', otherwise it is a list of numbers. The string 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() function has been imported using from array import array. Examples:

array(‘l’) array(‘c’, ‘hello world’) array(‘u’, u’hello u2641’) array(‘l’, [1, 2, 3, 4, 5]) array(‘d’, [1.0, 2.0, 3.14])

See also:

Module struct

Packing and unpacking of heterogeneous binary data.

Module xdrlib

Packing and unpacking of External Data Representation (XDR) data as used in some remote procedure call systems.