import pandas as pd 
df = pd.read_csv('Nowcoder.csv',sep=',')
pd.set_option('display.width', 300) # 设置字符显示宽度
pd.set_option('display.max_rows', None) # 设置显示最大行
pd.set_option('display.max_columns', None)
ach_7 = df[df.Level==7].Achievement_value
ach_total = df.Achievement_value.sum()
print(ach_7/ach_total)
# numpy数组的矢量化特性