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Python Time & Space Complexity

Tty

tty Module¶

The tty module provides functions for working with terminal I/O control on Unix systems, setting raw and cooked modes.

Complexity Reference¶

Operation	Time	Space	Notes
`setraw()` / `setcbreak()`	O(1)	O(1)	Configure terminal mode; Unix only
Restore mode	O(1)	O(1)	Save/restore via termios

Terminal Mode Control¶

Setting Raw Mode¶

import tty
import sys
import termios

# Save terminal settings
old_settings = termios.tcgetattr(sys.stdin)

try:
    # Set raw mode - O(1)
    tty.setraw(sys.stdin.fileno())

    # Now terminal reads character-by-character
    ch = sys.stdin.read(1)
    print(f"Got: {repr(ch)}")

finally:
    # Restore - O(1)
    termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)

Setting Cbreak Mode¶

import tty
import sys
import termios

old_settings = termios.tcgetattr(sys.stdin)

try:
    # Set cbreak mode - O(1)
    tty.setcbreak(sys.stdin.fileno())

    # Read without echo
    ch = sys.stdin.read(1)
    print(f"Pressed: {repr(ch)}")

finally:
    termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)