Create App.py

App.py

@@ -0,0 +1,104 @@
+import streamlit as st
+import pandas as pd
+
+# Grade to grade point mapping
+grade_points = {
+    "A": 4.0, "A-": 3.7,
+    "B+": 3.3, "B": 3.0, "B-": 2.7,
+    "C+": 2.3, "C": 2.0, "C-": 1.7,
+    "D+": 1.3, "D": 1.0, "F": 0.0
+}
+
+# Configure page
+st.set_page_config(page_title="GPA/CGPA Calculator", layout="wide")
+
+# Title and description
+st.markdown("""
+    <h1 style='text-align: center; color: #4CAF50;'>📊 GPA / CGPA Calculator</h1>
+    <p style='text-align: center;'>Add your current subjects and optionally previous semester GPA to calculate your CGPA</p>
+""", unsafe_allow_html=True)
+
+# Initialize session state
+if "subjects" not in st.session_state:
+    st.session_state.subjects = []
+
+# Optional previous semester data
+with st.expander("📚 Add Previous Semester Data (Optional)", expanded=False):
+    prev_credits = st.number_input("Total Credit Hours from Previous Semesters", 
+                                 min_value=0.0, step=0.5, value=0.0)
+    prev_gpa = st.number_input("Cumulative GPA from Previous Semesters", 
+                             min_value=0.0, max_value=4.0, step=0.01, value=0.0)
+
+# Subject form
+with st.form("subject_form", clear_on_submit=True):
+    col1, col2, col3 = st.columns(3)
+    with col1:
+        subject = st.text_input("Subject Name", placeholder="e.g., Mathematics")
+    with col2:
+        grade = st.selectbox("Grade", list(grade_points.keys()))
+    with col3:
+        credit = st.number_input("Credit Hours", min_value=0.5, max_value=6.0, step=0.5, value=3.0)
+
+    submitted = st.form_submit_button("➕ Add Subject")
+    
+    if submitted:
+        if not subject.strip():
+            st.error("Please enter a subject name")
+        elif credit <= 0:
+            st.error("Credit hours must be positive")
+        else:
+            st.session_state.subjects.append({
+                "Subject": subject.strip(),
+                "Grade": grade,
+                "Credit": credit
+            })
+            st.success(f"Added {subject.strip()} ({grade}, {credit} credits)")
+
+# Display current subjects
+if st.session_state.subjects:
+    st.markdown("### 🧾 Current Semester Subjects")
+    df = pd.DataFrame(st.session_state.subjects)
+    st.dataframe(df, use_container_width=True, hide_index=True)
+    
+    # Calculate current semester GPA
+    try:
+        current_points = sum(grade_points[row["Grade"]] * row["Credit"] for row in st.session_state.subjects)
+        current_credits = sum(row["Credit"] for row in st.session_state.subjects)
+        current_gpa = round(current_points / current_credits, 2)
+        
+        # Calculate CGPA (if previous data exists)
+        if prev_credits > 0:
+            total_credits = prev_credits + current_credits
+            total_points = (prev_gpa * prev_credits) + current_points
+            cgpa = round(total_points / total_credits, 2)
+        else:
+            cgpa = current_gpa
+        
+        # Display results in a nice card
+        st.markdown(f"""
+            <div style="background-color:#f0f2f6;padding:20px;border-radius:10px;margin-top:20px;">
+                <h3>📘 Current Semester GPA: <span style="color:#2196F3;">{current_gpa:.2f}</span></h3>
+                <h3>🌟 Cumulative GPA (CGPA): <span style="color:#4CAF50;">{cgpa:.2f}</span></h3>
+                <p>Total Credits: {current_credits + prev_credits}</p>
+            </div>
+        """, unsafe_allow_html=True)
+        
+    except ZeroDivisionError:
+        st.error("Error: Cannot calculate GPA with zero credit hours")
+
+else:
+    st.info("ℹ️ Add at least one subject to calculate your GPA")
+
+# Clear button (only shown when there are subjects)
+if st.session_state.subjects:
+    if st.button("🗑️ Clear All Subjects", type="primary"):
+        st.session_state.subjects = []
+        st.rerun()
+
+# Footer
+st.markdown("---")
+st.markdown("""
+    <div style="text-align: center; color: #777; font-size: 0.9em;">
+        <p>GPA Calculator • Grades: A (4.0) to F (0.0)</p>
+    </div>
+""", unsafe_allow_html=True)