# Program 51: Write File
def main():
    f = open("test.txt", "w")

    f.write("Hello Python\n")
    f.write("File Writing\n")

    f.close()

    print("File written")

main()

File written

# Program 52: Read File
def main():
    f = open("test.txt", "r")

    content = f.read()

    print("Content:")
    print(content)

    f.close()

main()

Content:
Hello Python
File Writing

# Program 53: Count Lines
def main():
    f = open("test.txt", "r")

    lines = f.readlines()

    count = len(lines)

    print("Total lines:", count)

    f.close()

main()

Total lines: 2