python生成随机二进制文件

 import random
 def genFile(filename,block=1,size=1):
         f=open(filename,"wb")
         content=""
         #for j in range(1024*1024):
         for j in range(1):
                 content=bytes(b"")
                 #for i in range(1024):
                 for i in range(1):
                         c=chr(random.randint(0,255)).encode('utf-8')
                         content=content+c
                 f.write(content)

 print(len(sys.argv))
 if len(sys.argv) != 2:
         print("usage:\t"+sys.argv[0]+"\toutfilename")
         sys.exit(1)
 genFile(sys.argv[1],1024,1024*1024)