You can find the sum of even numbers between two given numbers in Python using a loop and conditional statements. Here's a breakdown:
1. Using a for loop and conditional statement:
This method involves iterating through all numbers between the given range and checking if each number is even. If it is, we add it to a running sum.
def sum_even_numbers(start, end):
"""
Calculates the sum of all even numbers between start and end (inclusive).
Args:
start: The starting number of the range.
end: The ending number of the range.
Returns:
The sum of all even numbers within the range.
"""
sum = 0
for num in range(start, end + 1):
if num % 2 == 0:
sum += num
return sum
# Example usage
start_num = 1
end_num = 10
sum_of_evens = sum_even_numbers(start_num, end_num)
print(f"The sum of even numbers between {start_num} and {end_num} is: {sum_of_evens}")2. Using a for loop and a step of 2:
This approach utilizes the range() function with a step of 2, directly iterating through only the even numbers in the given range.
def sum_even_numbers(start, end):
"""
Calculates the sum of all even numbers between start and end (inclusive).
Args:
start: The starting number of the range.
end: The ending number of the range.
Returns:
The sum of all even numbers within the range.
"""
sum = 0
for num in range(start, end + 1, 2):
sum += num
return sum
# Example usage
start_num = 1
end_num = 10
sum_of_evens = sum_even_numbers(start_num, end_num)
print(f"The sum of even numbers between {start_num} and {end_num} is: {sum_of_evens}")3. Using list comprehension and sum() function:
This method combines list comprehension and the sum() function for a concise and efficient solution. It creates a list of all even numbers within the range and then directly sums the elements of the list.
def sum_even_numbers(start, end):
"""
Calculates the sum of all even numbers between start and end (inclusive).
Args:
start: The starting number of the range.
end: The ending number of the range.
Returns:
The sum of all even numbers within the range.
"""
return sum([num for num in range(start, end + 1) if num % 2 == 0])
# Example usage
start_num = 1
end_num = 10
sum_of_evens = sum_even_numbers(start_num, end_num)
print(f"The sum of even numbers between {start_num} and {end_num} is: {sum_of_evens}")These are just a few ways to find the sum of even numbers in Python. Choose the method that best suits your programming style and the specific context of your application.
