Reverse the Content of a File and Store it in Another File - Python

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 three ways.  

• Full reversing: Reverse all characters in the file completely.
• Line-wise Reversing: Reverse the order of lines in the file.
• Word to word reversing: Reverse the order of words in each line. 

Example: Full Reversing

Input:
Hello Geeks
for geeks!

Output:
!skeeg rof
skeeG olleH

Example 2: Line-wise Reversing

Input:
Hello Geeks
for geeks!

Output:
for geeks!
Hello Geeks 

Example 3: Word to word reversing

Input:
Hello Geeks
for geeks!

Output:
Geeks Hello
geeks! for

Sample Input File:

Full Reversing Using String Slicing

This method reads the entire file as a single string and reverses it using Python slicing. It is simple and fast but not suitable for very large files due to memory usage.

Output

Explanation:

• read(): Reads the entire file as a string
• data[::-1]: Reverses all characters
• write(): Writes reversed content to output file

Reversing Order of Lines Using readlines()

This approach reverses the order of lines instead of characters. It reads all lines into a list and reverses the list.

Output

Explanation:

• readlines(): Reads file into a list of lines
• lines[::-1]: Reverses line order
• writelines(): Writes reversed lines

Word-to-Word Reversing

This method reverses words in each line while keeping line order intact. Useful when sentence structure must be preserved.

Output

Explanation:

• split(): Splits line into words
• [::-1]: Reverses word order
• join(): Combines words back into a line

Related Articles:

• Python Program to Reverse the Content of a File using Stack
• Reverse Words in a Given String in Python