data.apply(pd.value_counts).fillna(0)用法data.apply(pd.value_counts).fillna(0)的意思
利用python进行数据分析data.apply(pd.value_counts).fillna(0)的意思data.apply(pd.value_counts).fillna(0)的意思import pandas as pd from pandas import Series, DataFramedata = DataFrame({'Qu1': [1, 3, 4, 3, 4], 'Qu2': [2, 3, 1, 2, 3],
