Python program to read character by character from a file

Given a text file. The task is to read the text from the file character by character.
Function used:

Syntax: file.read(length)
Parameters: An integer value specified the length of data to be read from the file.
Return value: Returns the read bytes in form of a string. 

Examples 1: Suppose the text file looks like this.

Python3

# Demonstrated Python Program
# to read file character by character


file = open('file.txt', 'r')

while 1:

    # read by character
    char = file.read(1)
    if not char:
        break

    print(char)

file.close()

Output 

Time complexity: O(n), where n is the number of characters in the file.
Auxiliary space: O(1), as the program reads and prints characters one at a time without storing them in memory.

Example 2: REading more than one characters at a time. 

Python3

# Python code to demonstrate
# Read character by character


with open('file.txt') as f:

    while True:

        # Read from file
        c = f.read(5)
        if not c:
            break

        # print the character
        print(c)

Output