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Arrays

Python’s standard data types list, tuple and string are sequences. A sequence object is an ordered collection of items. Each item is characterized by incrementing index starting with zero. Moreover, items in a sequence need not be of same type. In other words, a list or tuple may consist of items of different data type.

An array is also an indexed collection of items, but the items must be of similar data type.

Syntax:

import array
obj = array.array(typecode[, initializer])

Ex:

a = arr.array('i', [1, 2, 3])

• The append() method adds a new element at the end of given array.
• The insert() method insert a new element at the specified index.
• The extend() method in array class appends all the elements from another array of same typecode.
• The remove() method removes the first occurrence of a given value from the array
• The pop() method removes an element at the specified index from the array, and returns the removed element.
• The reverse() method which rearranges the elements in reverse order.
• The count() method returns the number of times a given element occurs in the array.
• The index() method in array class finds the position of first occurrence of a given element in the array.
• The fromlist() method appends items from a Python list to the array object.
• The tofile() method in array class writes all items (as machine values) in the array to the file object f.
• The fromfile() method reads a binary file and appends specified number of items to the array object.

Joining Array

• To join two arrays, we can do it by appending each item from one array to other.
• Using another method to join two arrays, first convert arrays to list objects.
• Convert the array to a list and then call the extend() method to merge the two lists

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