Append to a file in Python programming language

In Python, there are various ways to create and modify files, and appending data to an existing file is one of them. Appending to a file is a process of adding new content to the end of an existing file without losing the previous content. This tutorial will explain the different methods of appending to a file using Python. By the end of this tutorial, you will have a good understanding of the various methods of appending data to a file in Python programming language. Let's get started!

How to append to a file in Python : 

• Open a file in append mode, using the  open()  method.
• Write or append data to the file using the  write()  method.
• Close the file using the  close()  method.
• Code Sample : 

file = open("example.txt", "a")
file.write("This line will be appended to the file.")
file.close()

How to append and read on the same File :

• Open a file in append-plus mode, using the  open()  method.
• Write or append data to the file using the  write()  method.
• Reset the file pointer to the beginning of the file using the  seek()  method with an argument of `0`, in order to read from the file.
• Read the contents of the file using the  open()  method.
• Close the file using the  close()  method.
• Code Sample : 

with open("example.txt", "a+") as file:
 file.write("This line will be appended to the file.\n")
 file.seek(0)
 contents = file.read()
print(contents)

Writing to a Binary File

• Open a file in binary append mode, using the  open()  method.
• Write or append binary data to the file using the  write()  method, with an argument of `b` preceding the binary data.
• Close the file using the  close()  method.
• Code Sample : 

with open("example.bin", "ab") as file:
 file.write(b"\x48\x65\x6c\x6c\x6f\x20\x57\x6f\x72\x6c\x64\x21")  

# hexadecimal representation of "Hello World!"