python中的value_counts()快捷方法的用法实例讲解
value_counts()是一种查看表格某列中有多少个不同值的快捷方法，并计算每个不同值有在该列中有多少重复值。
1、value_counts()在Series的用法
import pandas as pd import numpy as np from pandas import DataFrame from pandas import Series s1=Series(["timo","mike","anni","timo"]) s1.value_counts()
timo 2 mike 1 anni 1 dtype: int64
2、value_counts()在DataFrame的用法
import pandas as pd
import numpy as np
from pandas import DataFrame
from pandas import Series
df1= DataFrame(
{"handsome":["timo","anni","timo"],
"smart":["mike","anni","mike"]}
)
print(df1)
df1.apply(pd.value_counts)##数据框要借助apply来应用value_counts()
handsome smart 0 timo mike 1 anni anni 2 timo mike
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