好吧，最近手停不下来了。今天看到网上有个名叫“快读啦”的快速阅读工具，号称能“让你不用移动眼睛，不用靠近屏幕就能阅读，保护视力”，觉得确实有用。可是它只有网页版，于是我便尝试用Python3写了一个。可以读txt电子书。Linux测试通过。

原理

从txt文件读取一个大字符串，每次只取一点点，每隔一段时间就移动切片。使用Tkinter作为图形界面（最近老是和GUI过不去……），chardet判断文本编码，突发奇想地用了getopt接收参数，还写了个帮助。

使用说明

Usage: python3 SpeadReading.py [options] FILENAME
Press any key to resume or pause.
Option list:
-p NUM, --pos=NUM Specify beginning position. 0 by default. (Useful as a bookmark)
-s NUM, --speed=NUM Specify the number of hanzi per minute. 750 by default
-w NUM, --width=NUM Specify the width of display. 3 by default
-z NUM, --size=NUM Specify the font size. 72 by default
-h, --help Show this help
Position number will be given every time when exit.

总之任意键开始或暂停，退出时有当前位置提醒，下次就可以当做书签参数输入了。

代码

#!/usr/bin/env python3
# -*- coding:utf-8 -*-
'''SpeedReading.py
Speed up your reading!
Author: Tianhu Zhang <zszth@126.com>
Run with option -h or --help to show help.
'''
import tkinter as tk
from tkinter import font
import chardet
import sys
import getopt
import os

# Settings.
hanzi_per_min = 750
hanzi_at_a_time = 3
hanzi_size = 72

# Constants.
pos = 0
txt = '废话还是不要多说的好，除非你是在凑字数。'
reading = False

# Getting variants.
def help():
print('''SpeedReading.py
Usage: python3 SpeadReading.py [options] FILENAME
Press any key to resume or pause.
Option list:
-p NUM, --pos=NUM Specify beginning position. 0 by default. (Useful as a bookmark)
-s NUM, --speed=NUM Specify the number of hanzi per minute. 750 by default
-w NUM, --width=NUM Specify the width of display. 3 by default
-z NUM, --size=NUM Specify the font size. 72 by default
-h, --help Show this help
Position number will be given every time when exit.''')
if len(sys.argv) < 2:
file_path = input('Input file name (or path): >')
pos = int(input('Input position: >'))
else:
try:
options,args = getopt.getopt(sys.argv[1:], 'hp:s:w:z:', ['help', 'pos=', 'speed=', 'width=', 'size='])
if args:
file_path = args[0]
if not os.path.isfile(file_path):
print('File not found.')
exit()
for opt, value in options:
if opt in ['-p', '--pos']:
pos = int(value)
if opt in ['-s', '--speed']:
hanzi_per_min = int(value)
if opt in ['-w', '--width']:
hanzi_at_a_time = int(value)
if opt in ['-z', '--size']:
hanzi_size = int(value)
else:
help()
exit()
except getopt.GetoptError:
help()
exit()

# Loading file.
with open(file_path, mode = 'rb') as f:
# print(chardet.detect(f.read())['encoding'])
data = f.read()
code = chardet.detect(data)['encoding']
txt = data.decode(code)
txt = '文始>' + txt.replace('\n', ' ') + '<文末'

# Preparing window.
root = tk.Tk()
root.title("速读 " + file_path)
show_font = font.Font(family = 'serif', size = hanzi_size, weight = 'normal')
show = tk.Label(root, text = '预备！', font = show_font)
def toogle(event):
global reading
reading = not reading
root.bind('<KeyPress>', toogle)
show.pack()
def timer():
global pos
if reading and pos < len(txt) - (hanzi_at_a_time - 1):
show.config(text = txt[pos: pos + hanzi_at_a_time])
pos = pos + 1
root.after(int(1000 * 60 / hanzi_per_min), timer)

# Start.
timer()
print('Press any key to resume or pause...')
show.config(text = txt[pos: pos + hanzi_at_a_time])
root.mainloop()
print('Stop at position {0}.'.format(pos))
if pos == len(txt) - (hanzi_at_a_time - 1):
print('Reading finished.')