Update app.py

app.py

@@ -6,7 +6,7 @@ import pandas as pd
 import xlsxwriter
 from io import BytesIO
 from collections import Counter
-import matplotlib.pyplot as plt  # Added for pie chart
+import matplotlib.pyplot as plt  # For pie chart
 
 # Set of 20 standard amino acids
 AMINO_ACIDS = set("ACDEFGHIKLMNPQRSTVWY")
@@ -60,17 +60,20 @@ if uploaded_file and st.button("Analyze File"):
         # 🔵 Pie Chart for Overall Stats
         st.subheader("🧁 Overall Amino Acid Composition (Pie Chart)")
 
-        fig, ax = plt.subplots()
+        fig, ax = plt.subplots(figsize=(6, 6))  # 50% of typical view size
         labels = list(overall_percentage.keys())
         sizes = list(overall_percentage.values())
 
-        # Filter zero values
+        # Filter out amino acids with 0% to avoid clutter
         filtered = [(label, size) for label, size in zip(labels, sizes) if size > 0]
-        labels, sizes = zip(*filtered)
-
-        ax.pie(sizes, labels=labels, autopct='%1.1f%%', startangle=90, counterclock=False)
-        ax.axis('equal')  # Equal aspect ratio ensures that pie is drawn as a circle.
-        st.pyplot(fig)
+        if filtered:
+            labels, sizes = zip(*filtered)
+
+            ax.pie(sizes, labels=labels, autopct='%1.1f%%', startangle=90, counterclock=False)
+            ax.axis('equal')  # Equal aspect ratio ensures the pie is circular.
+            st.pyplot(fig)
+        else:
+            st.info("No valid amino acids found to display in pie chart.")
 
         # Export to Excel
         def to_excel(df):