How Can I Implement Non-Blocking Console Input in Python for Real-Time Applications?-Python Tutorial-php.cn

How Can I Implement Non-Blocking Console Input in Python for Real-Time Applications?

Susan Sarandon

Release： 2024-12-04 05:07:14

Original

778 people have browsed it

How Can I Implement Non-Blocking Console Input in Python for Real-Time Applications?

Non-Blocking Console Input: Unlocking Asynchronous Handling

Consider the following scenario: you're crafting an IRC client in Python and have established a loop to receive and analyze data from the server. However, when you employ raw_input to enter text, the loop abruptly halts until your input is complete. This interruption impedes the smooth functioning of the loop.

To tackle this challenge and maintain the loop's continuous execution, various non-blocking input methods are available:

For Windows (Console Only):

Utilize the msvcrt module:

import msvcrt

num = 0
done = False
while not done:
    print(num)
    num += 1

    if msvcrt.kbhit():
        print("you pressed", msvcrt.getch(), "so now I will quit")
        done = True

Copy after login

For Linux:

Leverage the termios module as described in this article:

import sys
import select
import tty
import termios

def isData():
    return select.select([sys.stdin], [], [], 0) == ([sys.stdin], [], [])

old_settings = termios.tcgetattr(sys.stdin)
try:
    tty.setcbreak(sys.stdin.fileno())

    i = 0
    while 1:
        print(i)
        i += 1

        if isData():
            c = sys.stdin.read(1)
            if c == '\x1b':         # x1b is ESC
                break

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

Copy after login

For Cross-Platform or GUI Integration:

Embrace Pygame:

import pygame
from pygame.locals import *

def display(str):
    text = font.render(str, True, (255, 255, 255), (159, 182, 205))
    textRect = text.get_rect()
    textRect.centerx = screen.get_rect().centerx
    textRect.centery = screen.get_rect().centery

    screen.blit(text, textRect)
    pygame.display.update()

pygame.init()
screen = pygame.display.set_mode( (640,480) )
pygame.display.set_caption('Python numbers')
screen.fill((159, 182, 205))

font = pygame.font.Font(None, 17)

num = 0
done = False
while not done:
    display( str(num) )
    num += 1

    pygame.event.pump()
    keys = pygame.key.get_pressed()
    if keys[K_ESCAPE]:
        done = True

Copy after login

By adopting these non-blocking input techniques, you can seamlessly integrate real-time user interactions without disrupting the flow of your IRC loop.

The above is the detailed content of How Can I Implement Non-Blocking Console Input in Python for Real-Time Applications?. For more information, please follow other related articles on the PHP Chinese website!