Create app.py

app.py

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+import streamlit as st
+
+def calculate(expression):
+    """
+    Calculates the mathematical expression using a safer approach
+    than eval().
+
+    Args:
+        expression (str): The mathematical expression to be evaluated.
+
+    Returns:
+        float: The result of the calculation, or None if an error occurs.
+    """
+
+    try:
+        # Use ast.literal_eval() for a more secure evaluation
+        result = ast.literal_eval(expression)
+    except (SyntaxError, ValueError):
+        return None  # Indicate an error
+
+    return result
+
+st.set_page_config(page_title="Beautiful Calculator", page_icon="calculator")
+st.title("Beautiful Calculator")
+
+# Use columns for a visually appealing layout
+col1, col2 = st.columns(2)
+
+# Create input fields for numbers and expression
+num1 = col1.number_input("First Number", key="num1")
+num2 = col2.number_input("Second Number", key="num2")
+user_expr = st.text_input("Enter Expression (e.g., +,-,*,/)", key="expression")
+
+# Create buttons for basic operations
+operators = ["+", "-", "*", "/"]
+for operator in operators:
+    if st.button(operator, key=operator):
+        # Ensure at least one number is provided before calculation
+        if num1 is not None and num2 is not None:
+            result = calculate(f"{num1} {operator} {num2}")
+        else:
+            result = None
+
+        if result is not None:
+            st.write(f"{num1} {operator} {num2} = {result}")
+        else:
+            st.error("Invalid expression or division by zero")
+
+# Display the user-entered expression for reference
+st.write("Your expression:", user_expr)