如何使用熊猫从列中提取类

Question

In the last column, I am trying to extract and only display a class. For example, 'truck' or 'car'. Do anyone know how to list them?

Answer 1

You can just check if str.contains your search value

df[df['col_name'].str.contains('truck')]

Or use a chained str.get and get the occurrences

df.col1.str.get(0).str.get(0)

Example:

df = pd.DataFrame()
df['col1'] = [[['truck',3, ('a',2)]], [['car', 2, ('b', 2)]]]

    col1
0   [[truck, 3, (a, 2)]]
1   [[car, 2, (b, 2)]]

where

df.col1.str.get(0).str.get(0)

yields

0    truck
1      car
Name: col1, dtype: object

So you can use loc

df.loc[df.col1.str.get(0).str.get(0).eq('truck')]

    col1
0   [[truck, 3, (a, 2)]]