python 去掉重复行

#!/usr/bin/env python
import sys;

def usage():
        print("%s <src_file> <dst_file>" %sys.argv[0]);

if "__main__" == __name__:
        if len(sys.argv) != 3:
                usage();
                sys.exit(1);

        #read file
        hFileSrc = open(sys.argv[1], 'r');
        strText = hFileSrc.read();
        hFileSrc.close();

        #operate
        strText = strText.replace('\r', '');
        strText = strText.replace('\n\n', '\n');

        #write file
        hFileDst = open(sys.argv[2], "w");
        hFileDst.write(strText);
        hFileDst.close();

        print("fix succ!");