Python Array tofile() Method

The Python arraytofile() method is used to append all the elements of an array to the file.

Syntax

Following is the syntax of Python arraytofile() method −

array_name.tofile(f)

Parameters

This method accepts file object as a parameter.

Return Value

This method does not return any value.

Example 1

Following is the basic example of Python arraytofile() method.

Here, We have appended an array ofunicode charater to the filetofile.txt −

import osimport array as arr#creating an arraymy_arr1=arr.array('u',['1','2','3','4','5'])print("Array Elements :", my_arr1)f=open('tofile.txt','wb')#Appending the array to the filemy_arr1.tofile(f)f.close#Reading the elements from filef=open("tofile.txt","r")data=f.read()print("File After appending array :",data)f.close

Output

Following is the output of the above code −

Array Elements : array('u', '12345')File After appending array : 1 2 3 4 5

Example 2

Lets try to append an array ofint data type to the filetofile.txt −

import array as arr# Creating an arraymy_arr1 = arr.array('i', [10, 20, 30, 40, 50])print("Array Elements:", my_arr1)# Writing the array to a filef = open('tofile.txt', 'wb')my_arr1.tofile(f)f.close()# Reading the array back from the filef = open('tofile.txt', 'rb')my_arr2 = arr.array('i')my_arr2.fromfile(f, len(my_arr1))f.close()print("File After reading array:", my_arr2)

Output

Following is the output of the above code −

Array Elements: array('i', [10, 20, 30, 40, 50])File After Appending Array: array('i', [10, 20, 30, 40, 50])