Python module Array

>>>Importarray# defines a sequence data structure>>>Help (Array)　　
#创建数组, equivalent to initializing an array such as: d={},k=[] and so on array (TypeCode [, initializer])--The create a new array #a =array.array (' C '), determines that the following action is a character and is a single character
#a =array.array (' i '), determines that the following operation is an integer|Attributes:|  | TypeCode--The typecode character used to create the array| ItemSize-The lengthinchbytes of one array item| |Methods defined here:|Append (...) |append (x)| #向array数组添加一个数值value |Append New value x to the end of the array.

>>> A=array.array (' i ') #整数, B and I are similar
>>> A.append (8)
>>> A.append (81)
>>> A
Array (' I ', [8, Bayi]) #构成list　

　　　　　　　　>>> A=array.array (' C ') #单个字符

>>> a.append (' G ')
>>> a.append (' G ')
>>> A
Array (' C ', ' GG ') #单个字符连接

>>> A=array.array (' u ') #Unicode character, meaning the following is the Unicode string to be entered.
>>> a.append (U ' x ') #不要漏掉u
>>> a.append (U ' x ')
>>> A
Array (' U ', u ' xx ')

|       |   buffer_info (...)     |      Buffer_info ( address, length) #当前内存地址和数组长度
　　　　　　  #返回一个元组 (address, length), gives the current memory address and the length of the buffer used to store the contents of the array

>>> A.buffer_info ()
(19225728, 7)

| Return a tuple (address, length) giving the current memory address and| The lengthinchItems of the buffer used to hold array's Contents|The length should is multiplied by the itemsize attribute to calculate| The buffer lengthinchbytes. | |Byteswap (...) |Byteswap ()|      |  Byteswap all items of the array. If the itemsinchThe array is not1, 2,     | 4,or8 bytesinchSize, RuntimeError israised. | |count (...) |count (x) the number of #统计array数组中某个元素 (x).

>>> A
Array (' I ', [9, 2, 9, 4, 10, 10, 10])
>>> A.count (10)
3
>>> A.count (9)
2

     |      inch The array.     |       |   Extend (...)     |      or iterable) #参数接受 arrays and objects that can be iterated

>>> A
Array (' I ', [9, 2, 9, 4, 10, 10, 10])
>>> a.extend ([3,5])
>>> A
Array (' I ', [9, 2, 9, 4, 10, 10, 10, 3, 5])

#如果添加整数会出现什么错误?

>>> A.extend (10)

Traceback (most recent):
File "<pyshell#131>", line 1, in <module>
A.extend (10)
TypeError: ' int ' object is not iterable #int不是可迭代对象

|Append items to the end of the array. #在末尾添加数组或可迭代对象| |FromFile (...) |FromFile (f, N)|      | Read N Objects fromThe file object F andappend them to the end of the|Array.     Also called as read. | |fromlist (...) |fromlist (list)|      | Append items to Array fromlist. | |fromstring (...) |fromstring (String)|      | Appends items fromthe string, interpreting it as an array of machine| Values,asifIt had been read froma file using the FromFile () method). | |Fromunicode (...) |Fromunicode (USTR)|      | Extends this array with data fromThe Unicode string ustr. | The array must be a type'u'array; otherwise a valueerror| israised. Use Array.fromstring (Ustr.decode (...)) to|Append Unicode data to a array of some other type. | |Index (...) |index (x)|      | Return index of first occurrence of XinchThe array. | |Insert (...) |Insert (i,x) #在i的位置插入一个新的item在array中| |Insert A new item x into the array before position I. | |Pop (...) |pop ([i])

>>> A=array.array (' i ')
>>> A.append (2)
>>> A.append (9)
>>> A.append (3)
>>> A
Array (' I ', [2, 9, 3])
>>> A.pop () #默认删除索引为-1 element, the last element, if the argument is passed by parameter index to delete the element.
3
>>> A
Array (' I ', [2, 9])

| Return the i-th element andDelete it fromThe array. I defaults to-1. | |Read (...) |FromFile (f, N)|      | Read N Objects fromThe file object F andappend them to the end of the|Array.     Also called as read. | |Remove (...) |Remove (x) #删除指定元素, x is the element you want to delete.| Remove the first occurrence of XinchThe array. | |Reverse (...) |reverse ()|      | Reverse the order of the itemsinchThe array. | |tofile (...) |ToFile (f)| |Write all items, as machine values, to the file object F. Also called as|write. | |tolist (...) | ToList ()List

A=array (' i ', [9, 2, 9, 4, 10, 10, 10, 3, 5])
>>> a.list ()

A.list ()
Attributeerror: ' Array.array ' object has no attribute ' list ' #array. Array does not have a list property
>>> a.tolist ()
[9, 2, 9, 4, 10, 10, 10, 3, 5]

     |       Convert Array to a ordinary list with the same items.     |       |   ToString (...)     |      ToString (), string

Array (' I ', [9, 2, 9, 4])
>>> a.tostring () #转化为string
' \t\x00\x00\x00\x02\x00\x00\x00\t\x00\x00\x00\x04\x00\x00\x00 '

     |   tounicode (...)     |      Tounicode () , Unicode  #将unicode的array数组, converted to a Unicode string string.

>>> A=array.array (' u ')
>>> a.append (U ' Xiaodeng ')

A.append (U ' xiaodeng ')
Typeerror:array item must be Unicode character
>>> A.app End (U ' x ')
>>> a.append (U ' i ')
>>> a.tounicode ()
U ' XI '

 | |      Write (...) |            ToFile (f)  | |   Write all items (as machine values) to the file object F. Also called as  |      write.       |  | ----------------------------------------------------------------------     |        Data descriptors defined here:  | |       ItemSize  |       The size, in   bytes, of one array item  | |  TypeCode  |        |  | ----------------------------------------------------------------------
 
 
  

Type code C type Minimum size in bytes# minimum byte size
' C ' character (character, single character) 1
' B ' signed integer 1
' B ' unsigned integer 1
' U ' Unicode character 2
' H ' signed integer 2
' H ' unsigned integer 2
' I ' signed integer 2
' I ' unsigned integer 2
' L ' signed integer 4
' L ' unsigned integer 4
' F ' floating point 4
' d ' floating point 8

Python module Array