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 a simple Python program to find the area of a rectangle:

```python

# Function to calculate the area of a rectangle

def calculate_rectangle_area(length, width):

    area = length * width

    return area

# Taking user input for length and width

length = float(input("Enter the length of the rectangle: "))

width = float(input("Enter the width of the rectangle: "))

# Calculating the area using the function

area_of_rectangle = calculate_rectangle_area(length, width)

# Displaying the result

print(f"The area of the rectangle with length {length} and width {width} is: {area_of_rectangle}")

```

This program defines a function `calculate_rectangle_area` that takes the length and width of the rectangle as parameters and returns the calculated area. User input is then taken for the length and width, and the area is calculated using the function. Finally, the program displays the result.