题解 | 牛客网大佬之间的差距
import pandas as pd
data = pd.read_csv('Nowcoder.csv')
# print(data[data['Level'] == 7][['Achievement_value']].apply(lambda x : x.max() - x.min())) 得到的为series对象
data1 = data[data['Level'] == 7]['Achievement_value']
print(data1.max() - data1.min())
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