python简单实现more的特性，pythonmore特性,这是python练习题，

python简单实现more的特性，pythonmore特性,这是python练习题，

这是python练习题，完成python简单实现more的特性。思路参考Unix/Linux编程实践，python教程

#!/usr/bin/env pyton# _*_ coding: gbk _*_from sys import argv, exit, stdout, stdinfrom os import path, isattyfrom getopt import getopt, GetoptErrorhelp_info = ["more.py [-h] file list...","\t-h\t显示帮助信息"]class _Getch:"""Gets a single character from standard input.  Does not echo to the screen."""def __init__(self):try:self.impl = _GetchWindows()except ImportError, err:self.impl = _GetchUnix()def __call__(self): return self.impl()class _GetchUnix:def __init__(self):import tty, sysdef __call__(self):import sys, tty, termiosfd = sys.stdin.fileno()old_settings = termios.tcgetattr(fd)try:tty.setraw(sys.stdin.fileno())ch = sys.stdin.read(1)finally:termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)return chclass _GetchWindows:def __init__(self):import msvcrtdef __call__(self):import msvcrtreturn msvcrt.getch()getch = _Getch()def usage():for l in help_info:print ldef do_more(lines):num_of_lines = 0i = 0while i < len(lines):num_of_lines = num_of_lines + 1 stdout.write(lines[i])i += 1if num_of_lines >= 12:num_of_lines = see_more(num_of_lines)if num_of_lines < 0:i += num_of_linesif i < 0:i = 0def see_more(num_of_lines):answer = getch()if answer== " ":return 0elif answer == "\r":return (num_of_lines - 1)elif answer == "q":exit(1) elif answer == "b":return (-num_of_lines)else:return 0if __name__ == "__main__":try:opts, args = getopt(argv[1:], "h")except GetoptError, err:print str(err)usage()exit(2)for o, a in opts:if o == "-h":usage()exit(0)else:print "Unkown options"usage()exit(2)if len(args) == 0:usage()#www.iplaypy.comelse:for file in args:if not path.exists(file):print file + ": No such file or directory"else:print file + ":"fp = open(file, 'r')lines = fp.readlines()do_more(lines)

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