File Handling with Python

 

f = open("My_file.txt")   # opens the file (default mode - read mode)

print(f"cursor position : {f.tell()}")   # tells the position of cursor

print(f.read())  # reads the file

print(f"cursor position : {f.tell()}")

f.seek(10)  # changes the position of cursor

print(f.read())

print(f"cursor position : {f.tell()}")

f.seek(0)

print(f.readline())  # reads one line at a time

print(f.readline())

print(f.readline())

f.seek(0)

print(f.readlines())  # reads the lines and returns a list

print(f.closed)   # checks if file is closed or not (True/False)

f.close()   # closes a file

print(f.closed)

# with block

# r  read mode (reads the files)

# w - write mode (deletes previous data and wite new data)

# a - append mode (adds new data to the previous data)

# r+ - read and write mode

with open("My_file1.txt", "r+" ) as f:  # works the same way as f = open("My_file.txt")

                                                # no need to close the file

    f.write("\nDo whatever you love....")

    print(f.read())

with open("My_file.txt") as f1:

    with open("My_file1.txt", "a") as f2:

        f2.write(f1.read())