Discover how to easily print all properties and values of an object in your code with this comprehensive guide to built-in functions.
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Create a step-by-step explanation on how to create a Python function that takes a list of numbers as input and returns the sum of all even numbers in the list. The function should return 0 if the list is empty or if there are no even numbers in the list.
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Let's break down how to create that Python function. Here's a step-by-step explanation:
1. Define the Function:
def
keyword in Python to define a function. Let's name it sum_even_numbers
.numbers
.def sum_even_numbers(numbers):
# Code to calculate the sum will go here
2. Handle Empty List:
def sum_even_numbers(numbers):
if not numbers: # Check if the list is empty
return 0
# Code to calculate the sum will go here
3. Initialize Sum:
even_sum
and initialize it to 0.def sum_even_numbers(numbers):
if not numbers:
return 0
even_sum = 0
# Code to calculate the sum will go here
4. Iterate Through the List:
for
loop to iterate through each number in the numbers
list.def sum_even_numbers(numbers):
if not numbers:
return 0
even_sum = 0
for number in numbers:
# Code to check for even numbers and update the sum will go here
5. Check for Even Numbers:
%
) to check if the current number
is even.def sum_even_numbers(numbers):
if not numbers:
return 0
even_sum = 0
for number in numbers:
if number % 2 == 0: # Check if the number is even
# Code to update the sum will go here
6. Update the Sum:
even_sum
.def sum_even_numbers(numbers):
if not numbers:
return 0
even_sum = 0
for number in numbers:
if number % 2 == 0:
even_sum += number # Add the even number to the sum
7. Return the Sum:
even_sum
.def sum_even_numbers(numbers):
if not numbers:
return 0
even_sum = 0
for number in numbers:
if number % 2 == 0:
even_sum += number
return even_sum
Now you have a Python function that takes a list of numbers, calculates the sum of all even numbers in the list, and returns the result. If the list is empty or contains no even numbers, it returns 0.
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By following these steps, you've successfully created a Python function that efficiently calculates the sum of even numbers within a given list. This example demonstrates fundamental programming concepts like function definition, conditional statements, loop iteration, and arithmetic operations in Python.