问题描述
值的数据框
当我尝试首先执行 groupby 时,它不会跳过这些值,并且在分组之前我无法将它们转换为空值
import numpy as np
import pandas as pd
df = pd.DataFrame(np.array([(1,29),(1,50),(2,None),12),(3,None)]),columns=['day','amount'])
df.groupby('day')['amount'].first(dropna=True)
我收到错误 _cython_agg_general() got an unexpected keyword argument 'dropna
解决方法
试试这个:
import numpy as np
import pandas as pd
df = pd.DataFrame(np.array([(1,29),(1,50),(2,None),12)]),columns=['day','amount'])
df[~df['amount'].isin([None])].groupby('day',dropna=True)['amount'].first()