Explain the Python File Open

Anubhav Sharma · 2025-10-29T22:45:25.240Z

Here’s the basic syntax : Common File Modes Mode Meaning Description 'r' Read Opens file for reading (default). Error if file doesn’t exist. 'w' Write Opens file for writing. Creates new or overwrites existing file. 'a' Append Opens file for appending. Adds data to the end. 'x' Create Creates new file. Error if file exists. 'b' Binary Used with binary files (e.g., 'rb' , 'wb' ). 't' Text Used with text files (default mode). '+' Read & Write Allows reading and writing (e.g., 'r+' , 'w+' ). Example 1: Read a file Example 2: Using with (Best Practice) Automatically closes the file after use: Example 3: Write to a file Example 4: Append to a file Example 5: Read line by line

Anubhav Sharma 281 29 Oct 2025

Anubhav Sharma

Student

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1 Answers

Anubhav Sharma 29 Oct 2025

Here’s the basic syntax:

file = open("filename.txt", "mode")

Common File Modes

Mode	Meaning	Description
`'r'`	Read	Opens file for reading (default). Error if file doesn’t exist.
`'w'`	Write	Opens file for writing. Creates new or overwrites existing file.
`'a'`	Append	Opens file for appending. Adds data to the end.
`'x'`	Create	Creates new file. Error if file exists.
`'b'`	Binary	Used with binary files (e.g., `'rb'`, `'wb'`).
`'t'`	Text	Used with text files (default mode).
`'+'`	Read & Write	Allows reading and writing (e.g., `'r+'`, `'w+'`).

Example 1: Read a file

file = open("example.txt", "r")
content = file.read()
print(content)
file.close()

Example 2: Using `with` (Best Practice)

Automatically closes the file after use:

with open("example.txt", "r") as file:
    content = file.read()
    print(content)

Example 3: Write to a file

with open("example.txt", "w") as file:
    file.write("Hello, World!")

Example 4: Append to a file

with open("example.txt", "a") as file:
    file.write("\nThis line is added at the end.")

Example 5: Read line by line

with open("example.txt", "r") as file:
    for line in file:
        print(line.strip())

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