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Sure, here's a simple Python code snippet that demonstrates how to perform a common task: calculating the square of a number using a function.

def calculate_square(number):
    square = number * number
    return square

# Input a number
user_input = float(input("Enter a number: "))

# Calculate the square using the function
result = calculate_square(user_input)

# Display the result
print(f"The square of {user_input} is {result}")

In this code, we define a function calculate_square that takes a number as input, calculates its square, and returns the result. The user is prompted to input a number, and the code then calls the function to calculate and display the square of that number. This is a simple example to illustrate how functions work in Python. You can modify and expand upon it for more complex operations or integrate it into other applications as needed.