Refine position selection in app.py for improved user experience

- Replaced the radio button for position selection with a select box, allowing users to choose between viewing all positions or specific ones.
- Updated the filtering logic to accommodate the new selection method, enhancing the clarity and relevance of displayed player data.

app.py

@@ -211,20 +211,21 @@ with tab2:
             with tab1:
                 col1, col2 = st.columns(2)
                 with col1:
-                    pos_var = st.radio('All Positions or Select?', ['All', 'Select'])
+                    pos_var = st.selectbox("Which position(s) would you like to view?",  ['All', 'Specific'], key='pos_var')
                 with col2:
-                    if pos_var == 'Select':
-                        pos_list = st.multiselect('Select Positions', ['P', 'C', '1B', '2B', '3B', 'SS', 'OF'])
+                    if pos_var == 'Specific':
+                        pos_select = st.multiselect("Select your position(s)", ['P', 'C', '1B', '2B', '3B', 'SS', 'OF'], key='pos_select')
                     else:
-                        pos_list = ['P', 'C', '1B', '2B', '3B', 'SS', 'OF']
+                        pos_select = None
 
                 if entry_parse_var == 'All':
                     st.session_state['player_frame'] = create_player_exposures(working_df, player_columns)
                     hold_frame = st.session_state['player_frame'].copy()
                     hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])
                     st.session_state['player_frame'].insert(1, 'Pos', hold_frame['Pos'])
-                    position_mask = st.session_state['player_frame']['Pos'].apply(lambda x: any(pos in x for pos in pos_list))
-                    st.session_state['player_frame'] = st.session_state['player_frame'][position_mask]
+                    if pos_select:
+                        position_mask = st.session_state['player_frame']['Pos'].apply(lambda x: any(pos in x for pos in pos_select))
+                        st.session_state['player_frame'] = st.session_state['player_frame'][position_mask]
                     st.dataframe(st.session_state['player_frame'].
                         sort_values(by='Exposure Overall', ascending=False).
                         style.background_gradient(cmap='RdYlGn').
@@ -235,8 +236,9 @@ with tab2:
                     hold_frame = st.session_state['player_frame'].copy()
                     hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])
                     st.session_state['player_frame'].insert(1, 'Pos', hold_frame['Pos'])
-                    position_mask = st.session_state['player_frame']['Pos'].apply(lambda x: any(pos in x for pos in pos_list))
-                    st.session_state['player_frame'] = st.session_state['player_frame'][position_mask]
+                    if pos_select:
+                        position_mask = st.session_state['player_frame']['Pos'].apply(lambda x: any(pos in x for pos in pos_select))
+                        st.session_state['player_frame'] = st.session_state['player_frame'][position_mask]
                     st.dataframe(st.session_state['player_frame'].
                         sort_values(by='Exposure Overall', ascending=False).
                         style.background_gradient(cmap='RdYlGn').