Python Program to Reverse the Content of a File using Stack

# Creating Stack class (LIFO rule)
class Stack:

    def __init__(self):

        # Creating an empty stack
        self._arr = []

    # Creating push() method.
    def push(self, val):
        self._arr.append(val)

    def is_empty(self):

        # Returns True if empty
        return len(self._arr) == 0

    # Creating Pop method.
    def pop(self):

        if self.is_empty():
            print("Stack is empty")
            return

        return self._arr.pop()

# Creating a function which will reverse
# the lines of a file and Overwrites the
# given file with its contents line-by-line
# reversed


def reverse_file(filename):

    S = Stack()
    original = open(filename)

    for line in original:
        S.push(line.rstrip("\n"))

    original.close()

    output = open(filename, 'w')

    while not S.is_empty():
        output.write(S.pop()+";\n")

    output.close()


# Driver Code
filename = "GFG.txt"

# Calling the reverse_file function
reverse_file(filename)

# Now reading the content of the file
with open(filename) as file:
    for f in file.readlines():
        print(f, end="")