Create app.py

app.py

@@ -0,0 +1,61 @@
+import streamlit as st
+import re
+
+def calculate(value, operation):
+    """
+    Perform the specified operation on the given value.
+
+    Parameters:
+    value (int or float): The number to operate on.
+    operation (str): The operation to perform ('square', 'cube', 'double').
+
+    Returns:
+    int or float: The result of the operation.
+    """
+    operations = {
+        'square': lambda x: x ** 2,
+        'cube': lambda x: x ** 3,
+        'double': lambda x: x * 2
+    }
+    return operations[operation](value)
+
+def is_valid_input(user_input):
+    """
+    Validate user input using regular expressions to ensure it is a number.
+
+    Parameters:
+    user_input (str): The user input to validate.
+
+    Returns:
+    bool: True if the input is valid, False otherwise.
+    """
+    pattern = r'^\d+(\.\d+)?$'  # Match integers and floating point numbers
+    return bool(re.match(pattern, user_input))
+
+def main():
+    """
+    The main function to run the Streamlit app.
+    """
+    st.title("Enhanced Calculator")
+
+    # Select operation
+    operation = st.selectbox("Select an operation", ('square', 'cube', 'double'))
+
+    # Slider for numeric input
+    x = st.slider('Select a value', min_value=0.0, max_value=100.0, value=1.0, step=0.1)
+    
+    # Validate numeric input using regular expression
+    user_input = st.text_input("Or enter a number:")
+    if user_input and is_valid_input(user_input):
+        x = float(user_input)
+    elif user_input:
+        st.error("Invalid input. Please enter a valid number.")
+
+    # Calculate the result
+    result = calculate(x, operation)
+    
+    # Display the result
+    st.write(f'The {operation} of {x} is {result}')
+
+if __name__ == "__main__":
+    main()