def clear_space():
    with open("test","r",encoding="utf-8") as fr:
        for line in fr:
            line = line.strip()
            if len(line) > 0:
                yield line
g = clear_space()
for line in g:
    with open("test.bak","a",encoding="utf-8") as fw:
        fw.write(line+"\n")

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