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Function Double with Mutable Parameter in Python

In this exercise, you will develop a Python function named "double_value" to calculate the double of an integer number and modify the data passed as an argument. Since Python does not use reference parameters in the same way as C#, you will use a mutable type like a list to achieve similar behavior. This exercise is perfect for practicing function definition, parameter passing, and list manipulation in Python. By implementing this function, you will gain hands-on experience in handling function definitions and parameter passing in Python. This exercise not only reinforces your understanding of functions but also helps you develop efficient coding practices for managing user interactions.



Group

Mastering Functions in Python

Objective

Develop a Python function named "double_value" to calculate the double of an integer number and modify the data passed as an argument. Since Python does not use reference parameters in the same way as C#, we will use a mutable type like a list to achieve similar behavior. For example:

def double_value(num):
num[0] *= 2

x = [5]
double_value(x)
print(x[0])

would display 10

Example Python Exercise

 Copy Python Code 
# Define the function double_value which doubles the value of the first element in the list
def double_value(num):
    num[0] *= 2  # Double the value of the first element in the list

# Main function to test the double_value function
def main():
    x = [5]  # Create a list with a single element (5)
    double_value(x)  # Call the double_value function to double the first element
    print(x[0])  # Print the first element of the list, which is now 10

# Call the main function to execute the program
main()

 Output

10

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More Python Programming Exercises of Mastering Functions in Python

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