How do you list even and odd numbers in python?

In this post, you will learn different ways to write Python programs to list even and odd numbers in a list. To check whether a number is odd or even, you can either ask the user to enter a number or you can provide a list from which the program can check whether the number is odd or even. Such type of program is generally asked during interviews and in the examination. This can also be helpful to improve our programming skills.

Print even and odd in the list using the for loop

In the given Python program, we are using the for loop to list the even and odd items in the list. In each iteration of the list, we apply the condition to check the even numbers, i.e., to check their remainder after dividing by 2. If the remainder is 0 (i% 2 == 0), add it to the even list; otherwise, add it to the odd list.

nums = [43, 20, 53, 12, 53, 5, 3, 2]

even = []
odd = []

for i in nums:
    if(i % 2 == 0):
        even.append(i)
    else:
        odd.append(i)
        
print("Even List: ",even)
print("Odd List: ",odd)

Output of the above code -

Even List:  [20, 12, 2]
Odd List:  [43, 53, 53, 5, 3]

Find even and odd in list using lambda function

A lambda function is a small anonymous function that takes any number of arguments, but can only have one expression. It is useful when writing a function inside a function. In the given example, we have easily found the even and odd numbers in the list using a lambda function. The argument and the function are surrounded by parentheses.

# Check and count odd and even numbers using lambda function

# list of numbers
numberlist = [11, 30, 28, 41, 22, 85, 7]

# print Even numbers in a list using Lambda function

even_numbers = list(filter(lambda x: x % 2 == 0,numberlist))
print("Total Even numbers in the list: ", even_numbers)


# print Odd numbers in a list using Lambda function

odd_numbers = list(filter(lambda x: x % 2 == 1,numberlist))
print("Total Odd numbers in the list: ", odd_numbers)

Output of the above code -

Total Even numbers in the list:  [30, 28, 22]
Total Odd numbers in the list:  [11, 41, 85, 7]

Find even and odd in the list using while loop

This Python program for listing the even and odd numbers is the same as the above. We just replace the for loop with a while loop.

# Check and count odd and even numbers using while loop

# list of numbers
numlist = [11, 30, 28, 41, 22, 85, 7]

even_count = []
odd_count = []
num = 0
  
# using while loop     
while(num < len(numlist)):
      
    # checking condition
    if numlist[num] % 2 == 0:
        even_count.append(numlist[num])
    else:
        odd_count.append(numlist[num])
      
    # increment num 
    num += 1
      
print("Even numbers in the list: ", even_count)
print("Odd numbers in the list: ", odd_count)

Output of the above code -

Even numbers in the list:  [30, 28, 22]
Odd numbers in the list:  [11, 41, 85, 7]

Find even and odd using function

Here is the Python program for listing the even and odd numbers from the specified range.

def find_even_odd(numbers):
    odd_numbers = [number for number in numbers if number % 2 == 1]
    even_numbers = [number for number in numbers if number % 2 == 0]
    return odd_numbers, even_numbers

numbers = range(1,40)
print("The odd numbers are {}".format(find_even_odd(numbers)[0]))
print("The even numbers are {}".format(find_even_odd(numbers)[1]))

Output of the above code:

The odd numbers are [1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39]
The even numbers are [2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38]

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