Matrix Style XTerm Screensaver in Python

#!/usr/bin/python
import fcntl, termios, struct, os, time, datetime, sys, re, random


def ioctl_GWINSZ(fd):
 try: ### Discover terminal width
   cr = struct.unpack('hh',fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
 except:                        
   return None                  
 return cr                      
                                
                                
def terminal_size():            
 cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
 if not cr:                     
  # ...then ctty                
  try:                          
    fd = os.open(os.ctermid(), os.O_RDONLY)
    cr = ioctl_GWINSZ(fd)       
    os.close(fd)                
  except:                       
    pass                        
 if not cr:                     
  # env vars or finally defaults
  try:                          
    cr = (env['LINES'], env['COLUMNS'])
  except:                       
    cr = (25, 80)               
 # reverse rows, cols           
 return int(cr[1]), int(cr[0])  
                                
                                
#::::::::::::::::::::.          
sys.stderr.write("\x1b[2J")     # Clear screen
sys.stderr.write("\x1b[37m")    # Set FG 
sys.stderr.write("\x1b[40m")    # Set BG Black
                                
                                
crange=['\x1b[38;5;16m', '\x1b[38;5;22m', '\x1b[38;5;28m', '\x1b[38;5;35m', '\x1b[38;5;42m', '\x1b[38;5;49m', '\x1b[1m\x1b[38;5;49m', '\x1b[1m\x1b[37m']           
#for t in range(len(crange)):   
# print crange[t]+str(t),       
                                
                                
sys.stderr.write("\x1b[37m")    # Set FG 
sys.stderr.write("\x1b[0m")     # Set 



def fx(x):
  if x>0 and x<7:
    return x
  else:
    return random.randint(1,2)


def write_text(x,y,text):
    x2=-1
    if random.randint(0,10)>4:
      x2=x+random.randint(0,width)
      if x2>width:
        x2=x2%width

      
    dly=random.uniform( 0.001 , 0.04 )
    sys.stderr.write("\x1b[40m")
    for m in range(len(text)-len(crange)):
      for t in range(len(text)-1):
        sys.stderr.write("\x1b["+str(y+t)+";"+str(x)+"H")
        sys.stderr.write( crange[ fx(t-m) ]),
        print text[t]
        
        if x2>=0:
          sys.stderr.write("\x1b["+str(y+t)+";"+str(x2)+"H")
          sys.stderr.write( crange[ fx(t-m) ]),
          print text[t]
      time.sleep(dly)

    v=random.randint(0,3)
    for t in range(len(text)-1):
        sys.stderr.write("\x1b["+str(y+t)+";"+str(x)+"H")
        sys.stderr.write( crange[ v ]),
        print text[t]
        
        if x2>=0:
          sys.stderr.write("\x1b["+str(y+t)+";"+str(x2)+"H")
          sys.stderr.write( crange[ v ]),
          print text[t]
    #time.sleep(dly/2)



    # reset color
    sys.stderr.write("\x1b[39m")        # Reset Color



# Read File content a text to be displayed
text=[]
fd = open( sys.argv[0] ,"r")
for line in fd:
    #print line,
    text=text+[line]
fd.close()



# 011001100100001110101001000101001010100101010010010011101010101010100101010101010101010110010110011001000011
# 00101010010101001010011001000011101010110001001010010101001010010010101001010100101010101010101001010101010101010101100101
# 0110011001001010011101010101010101001010100101010010001010101010101010101100101100110010000110010101
# 011010101001000101001110101001001000101010101010010101010101010101011001011011001100100110010000110010101
# 011001100100001110101001000101001010100101010010010011101001110101001010101010101010110010110011001000011
# 000011101010110001001010010101001011001000011010010010101001010100101010101010101001010101010101010101100101
# 011001100100001110101001010011101010101010101001010100101010010001010101010101010101100101100110010000110010101
# 01100111010101010010010000111010100100010100111010100100100011100100101010101001010101010101010101100101100110010000110010101
# 0101001001000101011001100100001110101001000101000111010100100100011100101010100101010010010011101010101010100101010101010101010110010110011001000011
# 01100110010001100010010100101010010101010101010101000011101001010101010101010101100101
# 011001100100001110101001010011101010101010101001010100101010010001010101010101010101100101100110010000110010101
# 0110011001000011101010010001010011101010101001010101010101010101100101100110010000110010101
# 011001100100001110101001000101001010100101010010010011101010101010100101010101010101010110010110011001000011
# 0010101001010100101001100100001110101001010100101010101010101001010101010101010101100101
# 0110011001001010011101010101010101001010100101010010001010101010101010101100101100110010000110010101
# 011010101001000101001110101001001000101010101010010101010101010101011001011011001100100110010000110010101
# 011001100100001110101001000101001010100101010010010011101001110101001010101010101010110010110011001000011
# 000011101010110001001010010101001011001000011010010010101001010100101010101010101001010101010101010101100101
# 0110011001000011101010010100111010101010101010010101001010100100010101010100101100010010100101010010100100101101010101100101100110010000110010101
# 01100111010101010010010000111010100100010100101010101001010101010101010101100101100110010000110010101
# 0101001001000101011001100100001110101001000101001010100101010010010011101010101010100101010101010101010110010110011001000011
# 01100110010001100010010100101010010101010101010101000011101001010101010101010101100101
# 011001100100001110101001010011101010101010101001010100101010010001010101010101010101100101100110010000110010101
# 0110011001000011101010010001010011101010101001010101010101010101100101100110010000110010101

# Display
while (1):
  #for x in range(0,width):
    width  = terminal_size()[0]
    height = terminal_size()[1]
    text2use=text[random.randint(0,len(text)-1)]
    if(len(text2use) > height) :
        text2use=text2use[0:height+1]

    x=random.randint(0,width-1)
    #y=random.randint(0, height/16 )
    y=0
    
    if random.randint(0,100)>=92:
     print

    write_text(x,y, text2use)