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What is the os.close() method in Python?

Shubham Singh Kshatriya

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

Python’s os.close() method closes a given file descriptor.

A file descriptor refers to a number that identifies an open file uniquely. It performs various I/O operations like writing and reading.

Syntax

os.close(fileDescriptor)

Parameter

This method accepts the following parameter:

  • fileDescriptor: This is the descriptor of the file that is to be closed.

Example

Let’s look at an example of the os.close() method in the code snippet below:

main.py
demo.txt
# import os module
import os

# file path
filePath = 'demo.txt'

# using os.open() to open the file
# and create its file descriptor
fileDescriptor = os.open(filePath, os.O_RDWR)

#
## some I/O operations
#

# using os.close() to close the file descriptor
os.close(fileDescriptor)

Explanation

  • Line 2: We import the os module.
  • Line 5: We declare a variable, filePath, containing the file path.
  • Line 9: We use the os.open() method to open the file and create its file descriptor.
  • Line 16: We use the os.close() method to close the file descriptor.

The specified file descriptor will be closed after using this method.

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os.close()
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CONTRIBUTOR

Shubham Singh Kshatriya

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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