Python中的数组用法指南|S2（重要函数） _itemsize

Python中的数组|S1(简介和函数)
以下是更多函数。
1.typecode：-此功能返回数据类型通过哪个数组初始化。
2.itemsize：-此函数返回尺寸以字节为单位单数组元素。
3. buffer_info()：-返回表示存储数组的地址和元素数在里面。

# Python code to demonstrate the working of # typecode, itemsize, buffer_info()# importing "array" for array operations import array# initializing array with array values # initializes array with signed integers arr = array.array( 'i' , [ 1 , 2 , 3 , 1 , 2 , 5 ]) # using typecode to print datatype of array print ( "The datatype of array is : " ) print (arr.typecode)# using itemsize to print itemsize of array print ( "The itemsize of array is : " ) print (arr.itemsize)# using buffer_info() to print buffer info. of array print ( "The buffer info. of array is : " ) print (arr.buffer_info())

输出如下：

The datatype of array is : i The itemsize of array is : 4 The buffer info. of array is : (29784224, 6)

除了导入数组, 我们还可以使用*导入数组。

# importing "array" using * for array operations from array import *# initializing array with array values # initializes array with signed integers arr = array( 'i' , [ 1 , 2 , 3 , 1 , 2 , 5 ]) print (arr)

输出如下：

array('i', [1, 2, 3, 1, 2, 5])

【Python中的数组用法指南|S2（重要函数）】4. count()：-此功能计算出现次数数组中提到的参数。
5.延伸：-此功能追加整个数组在其对指定数组的参数中提到的内容。

# Python code to demonstrate the working of # count() and extend()# importing "array" for array operations import array# initializing array 1 with array values # initializes array with signed integers arr1 = array.array( 'i' , [ 1 , 2 , 3 , 1 , 2 , 5 ]) # initializing array 2 with array values # initializes array with signed integers arr2 = array.array( 'i' , [ 1 , 2 , 3 ]) # using count() to count occurrences of 1 in array print ( "The occurrences of 1 in array is : " ) print (arr1.count( 1 ))# using extend() to add array 2 elements to array 1 arr1.extend(arr2)print ( "The modified array is : " ) for i in range ( 0 , 9 ): print (arr1[i])

输出如下：

The occurrences of 1 in array is : 2 The modified array is : 1 2 3 1 2 5 1 2 3

6. fromlist(清单)：-此功能用于追加清单在论点中提到到数组末尾.
7. tolist()：-此功能用于将数组转换为列表.

# Python code to demonstrate the working of # fromlist() and tolist()# importing "array" for array operations import array# initializing array with array values # initializes array with signed integers arr = array.array( 'i' , [ 1 , 2 , 3 , 1 , 2 , 5 ]) # initializing list li = [ 1 , 2 , 3 ]# using fromlist() to append list at end of array arr.fromlist(li)# printing the modified array print ( "The modified array is : " , end = "") for i in range ( 0 , 9 ): print (arr[i], end = " " )# using tolist() to convert array into list li2 = arr.tolist()print ( "\r" )# printing the new list print ( "The new list created is : " , end = "") for i in range ( 0 , len (li2)): print (li2[i], end = " " )

输出如下：