Python program to reverse the content of a file and store it in another file

Last Updated : 20 Feb, 2023

Given a text file. The task is to reverse as well as stores the content from an input file to an output file.
This reversing can be performed in two types.

Full reversing: In this type of reversing all the content gets reversed.
Word to word reversing: In this kind of reversing the last word comes first and the first word goes to the last position.

Example 1: Full Reversing

Input: Hello Geeks
       for geeks!
        

Output:!skeeg rof
        skeeG olleH

Example 2: Word to word reversing

Input: 
        Hello Geeks
        for geeks!

Output:
         geeks! for
         Geeks Hello

Example 1: Full Reversing
Text file:

python-reverse-file-input

Python

# Open the file in write mode
f1 = open("output1.txt", "w")
 
# Open the input file and get 
# the content into a variable data
with open("file.txt", "r") as myfile:
    data = myfile.read()
 
# For Full Reversing we will store the 
# value of data into new variable data_1 
# in a reverse order using [start: end: step],
# where step when passed -1 will reverse 
# the string
data_1 = data[::-1]
 
# Now we will write the fully reverse 
# data in the output1 file using 
# following command
f1.write(data_1)
 
f1.close()

Output:

python-reverse-file-output-1

Time complexity: O(n), where n is the length of the input file “file.txt”.

Auxiliary space: O(n), where n is the length of the input file “file.txt”.

Example 2: Reversing the order of lines. We will use the above text file as input.

Python3

# Open the file in write mode
f2 = open("output2.txt", "w")
 
 
# Open the input file again and get 
# the content as list to a variable data
with open("file.txt", "r") as myfile:
    data = myfile.readlines()
 
# We will just reverse the 
# array using following code
data_2 = data[::-1]
 
# Now we will write the fully reverse 
# list in the output2 file using 
# following command
f2.writelines(data_2)
 
f2.close()

Output:

python-reverse-file-output-2

harshal jaiswal

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