通过从选择框中选择列值来定义 dataframe（流线型）

Question

I want to get a new dataframe by selecting a value from the list.

region_name_input = st.selectbox(
'Регион',
df_ru.groupby('region_name').count().reset_index()['region_name'], key=4)

data = df_ru[df_ru['region_name' == region_name_input]]

st.write(data)

My error

With multi-selection, I did it like this

region_name_inputs = st.multiselect(
'Регион',
df_ru.groupby('region_name').count().reset_index()['region_name'].tolist(), key=1)

if len(region_name_inputs) > 0:
    subset_data = df_ru[df_ru['region_name'].isin(region_name_inputs)]

At the output, I want to get a dataframe in which all the values with this field are collected.

Answer 1

data = df_ru[df_ru['region_name'].isin([region_name_input])]

Pointed as a one-dimensional list, eo could be used.query