Update src/streamlit_app.py

src/streamlit_app.py

@@ -11,9 +11,9 @@ tabs = st.tabs(["Time Value of Money", "Consistent Cash Flow Investment", "Monte
 # --- Time Value of Money ---
 with tabs[0]:
     st.header("Time Value of Money")
-    a = st.number_input("Base Amount (a)", min_value=0.0, value=1000.0)
-    r = st.number_input("Annual Return Rate (r)", min_value=0.0, value=0.05)
-    T = st.number_input("Number of Years (T)", min_value=0, value=10)
+    a = st.number_input("Base Amount (a)", min_value=0.0, value=1000.0, key="tv_a")
+    r = st.number_input("Annual Return Rate (r)", min_value=0.0, value=0.05, key="tv_r")
+    T = st.number_input("Number of Years (T)", min_value=0, value=10, key="tv_T")
 
     future_value = a * ((1 + r) ** T)
     st.write(f"Future Value = {a} * (1 + {r})^{T} = **{future_value:,.2f}**")
@@ -21,9 +21,9 @@ with tabs[0]:
 # --- Consistent Cash Flow Investment ---
 with tabs[1]:
     st.header("Consistent Cash Flow Investment")
-    a_cf = st.number_input("Annual Cash Flow (a)", min_value=0.0, value=1000.0)
-    r_cf = st.number_input("Annual Return Rate (r)", min_value=0.0, value=0.05)
-    T_cf = st.number_input("Number of Years (T)", min_value=0, value=10)
+    a_cf = st.number_input("Annual Cash Flow (a)", min_value=0.0, value=1000.0, key="cf_a")
+    r_cf = st.number_input("Annual Return Rate (r)", min_value=0.0, value=0.05, key="cf_r")
+    T_cf = st.number_input("Number of Years (T)", min_value=0, value=10, key="cf_T")
 
     if r_cf > 0:
         fv_cf = a_cf * (((1 + r_cf) ** T_cf - 1) / r_cf)
@@ -35,9 +35,9 @@ with tabs[1]:
 # --- Monte Carlo Simulation ---
 with tabs[2]:
     st.header("Monte Carlo Simulation")
-    mean_return = st.number_input("Mean Annual Return", value=0.07)
-    std_dev = st.number_input("Standard Deviation", value=0.15)
-    years = st.slider("Number of Years", 1, 100, 30)
+    mean_return = st.number_input("Mean Annual Return", value=0.07, key="mc_mean")
+    std_dev = st.number_input("Standard Deviation", value=0.15, key="mc_std")
+    years = st.slider("Number of Years", 1, 100, 30, key="mc_years")
     simulations = 50
 
     # Simulate paths