Python程序计算列表中的偶数和奇数

给定一个数字列表，编写一个Python程序来计算列表中的偶数和奇数。

例子：

Input: list1 = [2, 7, 5, 64, 14]
Output: Even = 3, odd = 2

Input: list2 = [12, 14, 95, 3]
Output: Even = 2, odd = 2

示例 1：使用 for 循环计算给定列表中的偶数和奇数

使用 for 循环迭代列表中的每个元素并检查是否 num % 2 == 0，即检查偶数的条件。如果条件满足，则增加偶数，否则增加奇数。

# Python program to count Even
# and Odd numbers in a List
  
# list of numbers
list1 = [10, 21, 4, 45, 66, 93, 1]
  
even_count, odd_count = 0, 0
  
# iterating each number in list
for num in list1:
      
    # checking condition
    if num % 2 == 0:
        even_count += 1
  
    else:
        odd_count += 1
          
print("Even numbers in the list: ", even_count)
print("Odd numbers in the list: ", odd_count)

输出：

Even numbers in the list:  3
Odd numbers in the list:  4

示例 2：使用 while 循环

# Python program to count Even and Odd numbers in a List
  
# list of numbers
list1 = [10, 21, 4, 45, 66, 93, 11]
  
even_count, odd_count = 0, 0
num = 0
  
# using while loop     
while(num < len(list1)):
      
    # checking condition
    if list1[num] % 2 == 0:
        even_count += 1
    else:
        odd_count += 1
      
    # increment num 
    num += 1
      
print("Even numbers in the list: ", even_count)
print("Odd numbers in the list: ", odd_count)

输出：

Even numbers in the list:  3
Odd numbers in the list:  4

示例 3：使用Python Lambda 表达式

# list of numbers
list1 = [10, 21, 4, 45, 66, 93, 11]
  
odd_count = len(list(filter(lambda x: (x%2 != 0) , list1)))
  
# we can also do len(list1) - odd_count
even_count = len(list(filter(lambda x: (x%2 == 0) , list1)))
  
print("Even numbers in the list: ", even_count)
print("Odd numbers in the list: ", odd_count)

输出：

Even numbers in the list:  3
Odd numbers in the list:  4

示例 4：使用列表理解

# Python program to print odd Numbers in a List
   
# list of numbers
list1 = [10, 21, 4, 45, 66, 93, 11]
   
only_odd = [num for num in list1 if num % 2 == 1]
odd_count = len(only_odd)
   
print("Even numbers in the list: ", len(list1) - odd_count)
print("Odd numbers in the list: ", odd_count)

输出：

Even numbers in the list:  3
Odd numbers in the list:  4