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统计一个特征里特征值的种类及其数量
import csv
with open('breast-cancer-test.csv','r') as f:
reader=csv.DictReader(f)
d=dict()
rows=[row['Cell Size'] for row in reader]
for a in rows:
if d.__contains__(a):
d[a]=d[a]+1
else:
dnew={a:1}
d.update(dnew)
print(d)
结果: