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# 适合普通大小文件的复制
def text_write(infilename, outfilename):
    infile = open(infilename, 'r')
    outfile = open(outfilename, 'w')
    for line in infile.readlines():
        print(line, file=outfile, end='')
    print('Done.')

＃ 适合大数据文件的复制
def buffer_write(infilename, outfilename, buffersize=5000):
    infile = open(infilename, 'rb')
    outfile = open(outfilename, 'wb')
    buffer = infile.read(buffersize)
    while len(buffer):
        outfile.write(buffer)
        print('.', end='')
        buffer = infile.read(buffersize)
    print()
    print('Done.')