Python Array tofile() Method

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

Syntax

Following is the syntax of Python array tofile() 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 array tofile() method.

Here, We have appended an array of unicode charater to the file tofile.txt −

import os
import array as arr
#creating an array
my_arr1=arr.array('u',['1','2','3','4','5'])
print("Array Elements :", my_arr1)
f=open('tofile.txt','wb')
#Appending the array to the file
my_arr1.tofile(f)
f.close
#Reading the elements from file
f=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 of int data type to the file tofile.txt −

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

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