0
我试图找出最大(First_Word, Group)
对大熊猫的GroupBy两个文本列,返回基于计数的最大行数
import pandas as pd
df = pd.DataFrame({'First_Word': ['apple', 'apple', 'orange', 'apple', 'pear'],
'Group': ['apple bins', 'apple trees', 'orange juice', 'apple trees', 'pear tree'],
'Text': ['where to buy apple bins', 'i see an apple tree', 'i like orange juice',
'apple fell out of the tree', 'partrige in a pear tree']},
columns=['First_Word', 'Group', 'Text'])
First_Word Group Text
0 apple apple bins where to buy apple bins
1 apple apple trees i see an apple tree
2 orange orange juice i like orange juice
3 apple apple trees apple fell out of the tree
4 pear pear tree partrige in a pear tree
然后我做了groupby
:
grouped = df.groupby(['First_Word', 'Group']).count()
Text
First_Word Group
apple apple bins 1
apple trees 2
orange orange juice 1
pear pear tree 1
现在
我希望将其过滤为仅具有最大Text
计数的唯一索引行。下面您会注意到apple bins
已被移除,因为apple trees
具有最大值。
Text
First_Word Group
apple apple trees 2
orange orange juice 1
pear pear tree 1
这max value of group问题是类似的,但是当我尝试这样的事:
df.groupby(["First_Word", "Group"]).count().apply(lambda t: t[t['Text']==t['Text'].max()])
我得到一个错误:KeyError: ('Text', 'occurred at index Text')
。如果我添加axis=1
到apply
我得到IndexError: ('index out of bounds', 'occurred at index (apple, apple bins)')