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交作业，unpack貌似能有30个字符，需要切片截取前30

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叫是先生

#1 Created at ... [Delete] [Delete and Lock User] 
def bmp_info(data):
    date = data[:30]
    t = struct.unpack('<ccIIIIIIHH',date)   
    return {
    'width': t[-4],
    'height': t[-3],
    'color': t[-1]
}
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