Python | os.isatty() method
OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.
os.isatty() method in Python is used to check whether the specified file descriptor is open and connected to a tty(-like) device or not. “tty” originally meant “teletype” and tty(-like) device is any device that acts like a teletype, i.e a terminal.
A file descriptor is small integer value that corresponds to a file or other input/output resource, such as a pipe or network socket. It is an abstract indicator of a resource and act as handle to perform various lower level I/O operations like read, write, send etc.
Syntax: os.isatty(fd)
Parameter:
fd: A file descriptor, whose is to be checked.Return Type: This method returns a Boolean value of class bool. Returns True if the specified file descriptor is open and connected to a tty(-like) device otherwise, returns False.
# Python program to explain os.isatty() method # importing os module import os # Create a pipe using os.pipe() method # It will return a pair of # file descriptors (r, w) usable for # reading and writing, respectively. r, w = os.pipe() # Check if file descriptor r # is open and connected # to a tty(-like) device # using os.isatty() method print("Connected to a terminal:", os.isatty(r)) # Open a new pseudo-terminal pair # using os.openpty() method # It will return master and slave # file descriptor for # pty ( pseudo terminal device) and # tty ( native terminal device) respectively master, slave = os.openpty() # Check if file descriptor master # is open and connected # to a tty(-like) device # using os.isatty() method print("Connected to a terminal:", os.isatty(master)) |
Connected to a terminal: False Connected to a terminal: True
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