Python File Input/Output

File Input/Output in Python

Reading from a File

• open() function is used to open a file in Python
• open() returns a file object, which has several methods for reading and writing
• read() method reads the entire file as a string
• readlines() method reads the entire file into a list of strings, where each string is a line in the file
• readline() method reads a single line from the file

Writing to a File

• open() function is used to open a file in write mode by specifying mode='w'
• write() method writes a string to the file
• writelines() method writes a list of strings to the file

Modes

• r : opens a file for reading (default)
• w : opens a file for writing, truncating the file first
• a : opens a file for appending, adds to the end of the file
• x : opens a file for exclusive creation, fails if the file already exists
• b : binary mode, used for reading and writing binary files
• t : text mode, used for reading and writing text files (default)
• + : opens a file for updating (reading and writing)

Example Code

## Reading from a file
with open('example.txt', 'r') as file:
    content = file.read()
    print(content)

## Writing to a file
with open('example.txt', 'w') as file:
    file.write('Hello, World!')

Context Manager

• with statement is used to open a file, which automatically closes the file when done
• This is known as a context manager, which ensures that resources are released after use

Learn how to read and write files in Python, including different modes and the context manager. This quiz covers the basics of file input/output in Python.