Python Program to Count Even and Odd Numbers in a List

Write a Python Program to Count Even and Odd Numbers in a List using For Loop, While Loop, and Functions with a practical example.

Python Program to Count Even and Odd Numbers in a List using For Loop

In this program, we are using For Loop to iterate every element in a given List. Inside the loop, we use the If statement to check and count Even and odd numbers.

NumList = []
Even_count = 0
Odd_count = 0

Number = int(input("Please enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
    value = int(input("Please enter the Value of %d Element : " %i))
    NumList.append(value)

for j in range(Number):
    if(NumList[j] % 2 == 0):
        Even_count = Even_count + 1
    else:
        Odd_count = Odd_count + 1

print("\nTotal Number of Even Numbers in this List =  ", Even_count)
print("Total Number of Odd Numbers in this List = ", Odd_count)

In this Python program, the User entered Python List elements = [2, 3, 5, 7], Even_count = 0, Odd_count = 0.

For Loop – First Iteration: for 0 in range(0, 4)
The condition is True. So, it enters into the Python If Statement.
if(NumList[0] % 2 == 0) => if(2 % 2 == 0) – Condition is True.
Even_count = Even_count + 1 => 0 + 1 = 1

Second Iteration: for 1 in range(0, 4) – Condition is True.
if(NumList[1] % 2 == 0) => if(3 % 2 == 0) – Condition is False.
So, it enters into the Else block.
Odd_count = Odd_count + 1 => 0 + 1 = 1

Third Iteration: for 2 in range(0, 4) – Condition is True.
if(NumList[2] % 2 == 0) => if(5 % 2 == 0) – Condition is False and enters into the Else block.
Odd_count =  1  + 1 = 2

Fourth Iteration: for 3 in range(0, 4) – Condition is True.
if(7 % 2 == 0) – Condition is False and enters into the Else block.
Odd_count =  2  + 1 = 3

Fifth Iteration: for 4 in range(4) – Condition is False. So, it exits from For Loop

Python Program to Count Even and Odd Numbers in a List using While loop

This program for counting is the same as the above. We just replaced the Python For Loop with the Python While loop. Also, refer to the Python tutorial page.

NumList = []
Even_count = 0
Odd_count = 0
j = 0

Number = int(input("Please enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
    value = int(input("Please enter the Value of %d Element : " %i))
    NumList.append(value)

while(j < Number):
    if(NumList[j] % 2 == 0):
        Even_count = Even_count + 1
    else:
        Odd_count = Odd_count + 1
    j = j + 1

print("\nTotal Number of Even Numbers in this List =  ", Even_count)
print("Total Number of Odd Numbers in this List = ", Odd_count)

Please enter the Total Number of List Elements: 5
Please enter the Value of 1 Element : 12
Please enter the Value of 2 Element : 13
Please enter the Value of 3 Element : 14
Please enter the Value of 4 Element : 15
Please enter the Value of 5 Element : 44

Total Number of Even Numbers in this List =   3
Total Number of Odd Numbers in this List =  2

Program to Count Even and Odd Numbers in a List using Functions

This count even and odd list numbers program is the same as the first example. However, we separated the logic using Functions in Python.

def count_even(NumList):
    Even_count = 0
    for j in range(Number):
        if(NumList[j] % 2 == 0):
            Even_count = Even_count + 1
    return Even_count

def count_odd(NumList):
    Odd_count = 0
    for j in range(Number):
        if(NumList[j] % 2 != 0):
            Odd_count = Odd_count + 1
    return Odd_count

NumList = []
Number = int(input("Please enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
    value = int(input("Please enter the Value of %d Element : " %i))
    NumList.append(value)

even_cnt = count_even(NumList)
odd_cnt = count_odd(NumList)
print("\nTotal Number of Even Numbers in this List =  ", even_cnt)
print("Total Number of Odd Numbers in this List = ", odd_cnt)

Please enter the Total Number of List Elements: 6
Please enter the Value of 1 Element : 12
Please enter the Value of 2 Element : 22
Please enter the Value of 3 Element : 33
Please enter the Value of 4 Element : 44
Please enter the Value of 5 Element : 55
Please enter the Value of 6 Element : 66

Total Number of Even Numbers in this List =   4
Total Number of Odd Numbers in this List =  2

Also Read

• Python program to Count Positive and Negative Numbers in a List
• Python program to find Length of a List