模拟Windows蓝屏的Python程序

一段有趣的Python程序，运行如下图：


#!/usr/bin/python
import sys,os
hist=[]
def actually_write():
    global hist
    sys.stdout.write("\x1b[%sm"%(";".join(hist)))
def o(msg):
    global hist
    msg="%02i"%msg
    hist.append(msg)
    actually_write()
def undo():
    global hist
    hist.pop()
    actually_write()
def reset():
    global hist
    hist=[]
    sys.stdout.write("\x1bc\x1b[!p\x1b[?3;4l\x1b[4l\x1b>")
    default()
def default():
    o(10) # in case someone called o(12) by mistake :P
    o(0)
def clear():
    sys.stdout.write("\x1b[H\x1b[2J")
def move(y,x):
    sys.stdout.write("\x1b[%i;%iH"%(y+1,x+1))
def up():
    sys.stdout.write("\x1b[A")
def down():
    sys.stdout.write("\x1b[B")
def right():
    sys.stdout.write("\x1b[C")
def left():
    sys.stdout.write("\x1b[D")
def endline():
    sys.stdout.write("\x1b[K")
def cursorinvisible():
    sys.stdout.write("\x1b[?25l")
def cursornormal():
    sys.stdout.write("\x1b[?12l\x1b[?25h")
def cursorveryvisible():
    sys.stdout.write("\x1b[?12;25h")
def deletelines(lines=1):
    sys.stdout.write("'\x1b[%iM"%lines)
def scrolldown():
    sys.stdout.write("\x1bM")
def cols():
    return int(os.popen("tput cols").read().strip())
def lines():
    return int(os.popen("tput lines").read().strip())
def savecursor():
    sys.stdout.write("\x1b7")
def restorecursor():
    sys.stdout.write("\x1b8")
def bold():
    o(1)
def hidden():
    o(2)
def underline():
    o(4)
def blink():
    o(5)
def reverse():
    o(7)
def formatting():
    o(12)
def black():
    o(30)
def red():
    o(31)
def green():
    o(32)
def orange():
    o(33)
def blue():
    o(34)
def magenta():
    o(35)
def cyan():
    o(36)
def white():
    o(37)
def bgred():
    o(41)
def bggreen():
    o(42)
def bgorange():
    o(43)
def bgblue():
    o(44)
def bgmagenta():
    o(45)
def bgcyan():
    o(46)
def bgwhite():
    o(47)
def put(line,indent,msg):
    move(line,indent)
    sys.stdout.write(msg)
def center(line,msg):
    columns=cols()
    indent=(columns-len(msg))/2
    put(line,indent,msg)
    return line,indent+len(msg)
def wrap(*args):
    "wrap(line, [[lmargin,] rmargin,] msg)"
    if len(args)==4:
        line,lmargin,rmargin,msg=args
    elif len(args)==3:
        line,rmargin,msg=args
        lmargin=0
    elif len(args)==2:
        line,msg=args
        lmargin,rmargin=0,0
    elif len(args)2:
        raise TypeError,"wrap() takes at least two arguments"
    else:
        raise TypeError,"wrap() takes at most four arguments"
    line_length=cols()-lmargin-rmargin
    msg=list(msg)
    curr_indent=0
    curr_line=line
    char=msg.pop(0)
    while 1:
        if line_length-curr_indent1:
            put(curr_line,lmargin+curr_indent,'\n')
            curr_line+=1
            curr_indent=0
            put(curr_line,lmargin,char)
        else:
            put(curr_line,lmargin+curr_indent,char)
            curr_indent+=1
            if len(msg)==0:
                break
            char=msg.pop(0)
    return curr_line,lmargin+curr_indent
def wordwrap(*args):
    "wordwrap(line, [[lmargin,] rmargin,] msg)"
    if len(args)==4:
        line,lmargin,rmargin,msg=args
    elif len(args)==3:
        line,rmargin,msg=args
        lmargin=0
    elif len(args)==2:
        line,msg=args
        lmargin,rmargin=0,0
    elif len(args)2:
        raise TypeError,"wordwrap() takes at least two arguments"
    else:
        raise TypeError,"wordwrap() takes at most four arguments"
    line_length=cols()-lmargin-rmargin
    msg=msg.split()
    curr_indent=0
    curr_line=line
    word=msg.pop(0)
    while 1:
        if line_lengthlen(word): # word is longer than allowed line
            put(curr_line,lmargin,word[:line_length]) # wrap by letter
            word=word[line_length:]
            put(curr_line,lmargin+curr_indent,'\n')
            curr_line+=1
            curr_indent=0
        elif line_length-curr_indentlen(word): # word cannot fit on remainder
            put(curr_line,lmargin+curr_indent,'\n') # of line -- wrap by word
            curr_line+=1
            curr_indent=0
            put(curr_line,lmargin,word)
        else: # word fits on line
            put(curr_line,lmargin+curr_indent,word)
            curr_indent+=len(word)+1
            if len(msg)==0:
                break
            word=msg.pop(0)
    return curr_line,lmargin+curr_indent
def main():
    reset()
    bgblue()
    white()
    bold()
    clear()
    reverse()
    center(5,' Windows ')
    undo()
    line,col=wordwrap(7,7,8,"Windows crashed again. I am the Blue Screen of Death. No one hears your screams.")
    print
    put(line+2,11,"*")
    line,col=wordwrap(line+2,14,8,"Press any key to terminate the application.")
    put(line+1,11,"*")
    line,col=wordwrap(line+1,14,8,"Press CTRL+ALT+DEL again to restart your computer. You will lose any unsaved data in all applications.")
    line,col=center(line+3,"Press any key to continue")
    move(line,col+1)
    endline()
    raw_input()
    reset()
if __name__=="__main__":
    main()

原文地址：
http://code.activestate.com/recipes/576503/