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import pandas as pd import numpy as np from matplotlib import pyplot as plt # 读取数据 excel1= pd.DataFrame(pd.read_excel('第5章 练习数据.xls',sheet_name='Sheet1')) #一，班级中以学号的班级填充 excel1_number=excel1["学号"] for int1 in excel1_number: int2=int1//100%10; if(.