readline(): reads a single line from a file

readline(limit)

fob=open('data.txt','r')
print(fob.readline()) # This is first line

fob=open('data.txt','r')
print(fob.readline(5)) # This
fob.close()

fob=open('data.txt','r')
print(fob.readline())
print(fob.readline())

This is first line

This is second line

Handling End-of-Line Characters

The readline() method returns the line including the newline character:

fob = open('data.txt', 'r')
line = fob.readline()
print(repr(line))  # Output: 'This is first line\n'
fob.close()

Use Case: Processing Large Files

When dealing with large files, readline() can be used to process them one line at a time without loading the entire file into memory:

with open('largefile.txt', 'r') as file:
    while line := file.readline():
        print(line.strip())

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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