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

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

# 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:

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: