我的熊猫数据框是：
FRUIT DATE PRICE CITY
Apple 11/5/2021 10 M
Apple 11/5/2021 11 N
Apple 11/5/2021 15 O
Apple 12/5/2021 14 A
Apple 12/5/2021 12 B
Apple 13/5/2021 8 C
Apple 13/5/2021 7 H
Apple 13/5/2021 6 K
orange 11/5/2021 13 L
orange 11/5/2021 12 J
orange 11/5/2021 33 H
Orange 11/5/2021 20 J
orange 12/5/2021 11 A
orange 12/5/2021 12 B
Orange 12/5/2021 29 C
orange 12/5/2021 20 M
Orange 13/5/2021 15 N
Banana 11/5/2021 3 A
Banana 11/5/2021 5 …