small changes

app.py

@@ -7,6 +7,10 @@ from utils import get_index, get_movie_info
 MAX_OVERVIEW_LENGTH = 280
 IMAGE_WIDTH = 170
 
+MIN_RECOMMENDATIONS = 1
+MAX_RECOMMENDATIONS = 100
+DEFAULT_RECOMMENDATIONS = 10
+
 
 @st.cache()
 def init() -> None:
@@ -21,14 +25,17 @@ def run() -> None:
     with st.form("search"):
         title = st.selectbox("Recommend movies based on:", st.session_state["titles"])
         num_recommendations = st.number_input(
-            "Number of recommendations:", min_value=1, max_value=20, value=6
+            "Number of recommendations:",
+            min_value=MIN_RECOMMENDATIONS,
+            max_value=MAX_RECOMMENDATIONS,
+            value=DEFAULT_RECOMMENDATIONS,
         )
         search = st.form_submit_button("Search")
     if search:
-        recommend(title, num_recommendations)
+        _recommend(title, num_recommendations)
 
 
-def recommend(based_on: str, num_recommendations: int) -> None:
+def _recommend(based_on: str, num_recommendations: int) -> None:
     movie_index = get_index(based_on)
     similarities = list(enumerate(st.session_state["sim_matrix"][movie_index]))
     similarities.pop(movie_index)
@@ -36,10 +43,10 @@ def recommend(based_on: str, num_recommendations: int) -> None:
     recommendations = sorted_similarities[:num_recommendations]
     st.markdown("---")
     for idx, _ in recommendations:
-        show_movie_info(idx)
+        _show_movie_info(idx)
 
 
-def show_movie_info(movie_index: str) -> None:
+def _show_movie_info(movie_index: str) -> None:
     info = get_movie_info(movie_index)
     im_col, info_col = st.columns([2, 4])
     im_col.image(