每行数据重复N次合并生成新文件，数据重复n合并,＂＂＂每行数据重复N次合

每行数据重复N次合并生成新文件，数据重复n合并,"""每行数据重复N次合

"""每行数据重复N次合并生成新文件题目来源 http://www.bathome.net/thread-38017-2-1.html依山居 0:54 2015/11/14这个版本可以使用来处理实际数据。。。6百万行，大约17秒。。。总结：几百万行数据真不算多。不需要逐行读取处理。python列表解析是个好东西~使用重复列表中元素更好的方法 http://www.oschina.net/question/96078_2141454python笔记_列表解析 http://www.jianshu.com/p/c635d3c798c2"""import timestart=time.time()an=6with open("aa.txt") as f:    ta=f.read()    ta=ta.rsplit()    al=[r+"," for r in ta for i in range(an)]print("al长度:",len(al))bn=3with open("bb.txt") as f:    tb=f.read()    tb=tb.rsplit()    bl=[r+"," for r in tb for i in range(bn)]print("bl长度:",len(bl))cn=1with open("cc.txt") as f:    tc=f.read()    tc=tc.rsplit()    cl=[r+"\n" for r in tc for i in range(cn)]print("cl长度:",len(cl))end=time.time()pt=end-startprint("运行耗时：",pt)rn=len(cl)tal=[al[r]+bl[r]+cl[r] for r in range(rn)]#还是用列表解析好~#for r in range(rn):#   tal.append(al[r]+bl[r]+cl[r])end=time.time()pt=end-startprint("运行耗时：",pt)with open("out.txt","w+") as f:    f.writelines(tal)    f.close()end=time.time()pt=end-startprint("运行耗时：",pt)try:    input("按回车退出")except SyntaxError:    pass