Update app.py

app.py

@@ -15,15 +15,22 @@ def calculate_match_percentage(user_seq, reference_seq):
     match_percentage = (matches / len(reference_seq)) * 100
     return match_percentage, highlighted
 
+def count_sequence_occurrences(sequence, substring):
+    """Counts the occurrences of a substring in the sequence."""
+    return sequence.count(substring)
+
 def main():
     st.title("DNA Sequence Matcher")
 
-    st.write("This application compares a DNA sequence you provide to a reference DNA sequence and calculates the match percentage.")
+    st.write("This application compares a DNA sequence you provide to a reference DNA sequence, calculates the match percentage, and finds occurrences of a specific sequence in the reference.")
 
     # Input fields
     reference_seq = st.text_input("Enter the reference DNA sequence:", "ACGTACGTACGT")
     user_seq = st.text_input("Enter your DNA sequence:")
 
+    # Input for substring to search
+    substring = st.text_input("Enter the DNA sequence to count its occurrences in the reference:")
+
     if len(user_seq) != len(reference_seq):
         st.warning("The length of your DNA sequence must match the length of the reference sequence.")
     elif user_seq and st.button("Compare"):
@@ -33,5 +40,10 @@ def main():
         st.markdown("### Highlighted Sequence:")
         st.markdown(f"{highlighted}", unsafe_allow_html=True)
 
+    # Check for substring occurrences
+    if substring:
+        count = count_sequence_occurrences(reference_seq, substring)
+        st.markdown(f"### Occurrences of '{substring}' in the reference sequence: {count}")
+
 if __name__ == "__main__":
     main()