pandas的series和dataframe

import pandas as pd
sr = pd.Series([1,2,3],index=['a','b','c'])
sr1 = pd.Series({'a':1,'b':4})
sr.index
sr.value
sr.values
'a' in sr
sr['a':'c']
sr['a']
sr1+sr
sr + sr1

sr.iloc[1]
sr.iloc[1:2]
sr.add(sr1,fill_value=0)

# 缺失值查找
sr.isnull()
sr.isna()
sr.notnull()

# 缺失值处理
sr.dropna()
sr.fillna(0)
sr.fillna(sr.mean())

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