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Python-使用[空格鍵]暫停循環

[英]Python - using [spacebar] to pause for loop

我正在尋找一種方法,當用戶按下[空格鍵]時暫停下面的for循環,然后在再次按下[空格鍵]時從最近的迭代繼續循環。

當前,腳本會提示用戶輸入三個值,然后以一定的時間間隔打印文本文件中的單詞,直到沒有剩余的單詞為止。

最好的方法是什么? 非常感謝。

import time

with open('Textfile.txt', 'r', encoding='utf8') as file:

    data = file.read()
    data2 = data.split()


def reading(start, speed, chunks):

    for i in range(start, len(data2), chunks):

        print('\r' + (' '.join(data2[i:i+chunks])), end="")

        time.sleep(60 / speed * chunks)

    print ("The End.")


start = int(input('Where would you like to start? (word number) '))
speed = int(input('How many words per minute? '))
chunks = int(input('How many words at a time? '))

reading(start, speed, chunks)

這是對您問題的部分答案(關於空間的部分內容未得到回答,但是請仔細閱讀,有一些提示)。 我從這里改編了答案python的subprocess.PIPE上的非阻塞讀取

import time
import sys
from threading import Thread
try:
    from Queue import Queue, Empty
except ImportError:
    from queue import Queue, Empty  # python 3.x


def enqueue_output(output, queue):
    for line in iter(output, b''):
        queue.put(line)
    out.close()


with open('Textfile.txt', 'r', encoding='utf8') as file:
    data = file.read()
    data2 = data.split()


def reading(start, speed, chunks):
    q = Queue()
    t = Thread(target=enqueue_output, args=(sys.stdin.readline, q))
    t.daemon = True # thread dies with the program
    t.start()

    for i in range(start, len(data2), chunks):
        print('\r' + (' '.join(data2[i:i+chunks])), end="")
        time.sleep(60 / speed * chunks)

        try:
            line = q.get_nowait() # or q.get(timeout=.1)
        except Empty:
            pass
        else:
            print("Pausing")
            while 1:
                time.sleep(0.3) # Adjust frequency of reading user's input
                try:
                    line = q.get_nowait() # or q.get(timeout=.1)
                except Empty:
                    pass
                else:
                    print("Resuming")
                    break

    print ("The End.")


start = int(input('Where would you like to start? (word number) '))
speed = int(input('How many words per minute? '))
chunks = int(input('How many words at a time? '))

reading(start, speed, chunks)

使用此用戶將可以通過按Enter按鈕暫停/恢復閱讀。 對於空間,您可以嘗試使用此答案中的配方如何在while循環中獲取用戶輸入而不會阻塞

...或使用一些控制台ui(curses,urwid等)或gui(tkinter,pyqt等)模塊。

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