使用 for 循环、while 循环和函数编写 Python 程序来计算列表中的奇偶数数量，并附带实际示例。
Python 程序：使用 for 循环计算列表中奇偶数的数量
在此程序中，我们使用 for 循环来迭代给定列表中的每个元素。在循环内，我们使用 if 语句来检查和计算奇偶数。
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)
在此 python 程序中，用户输入的 List 元素 = [2, 3, 5, 7]，Even_count = 0，Odd_count = 0。
For 循环 – 第一次迭代： for 0 in range(0, 4)
条件为 True。因此，它进入 If 语句。
if(NumList[0] % 2 == 0) => if(2 % 2 == 0) – 条件为 True。
Even_count = Even_count + 1 => 0 + 1 = 1
第二次迭代：for 1 in range(0, 4) – 条件为 True。
if(NumList[1] % 2 == 0) => if(3 % 2 == 0) – 条件为 False。
因此，它进入 Else 块。
Odd_count = Odd_count + 1 => 0 + 1 = 1
第三次迭代：for 2 in range(0, 4) – 条件为 True。
if(NumList[2] % 2 == 0) => if(5 % 2 == 0) – 条件为 False，进入 Else 块。
Odd_count = 1 + 1 = 2
第四次迭代：for 3 in range(0, 4) – 条件为 True。
if(7 % 2 == 0) – 条件为 False，进入 Else 块。
Odd_count = 2 + 1 = 3
第五次迭代：for 4 in range(4) – 条件为 False。因此，它退出 for 循环。
Python 程序：使用 while 循环计算列表中奇偶数的数量
此计数程序与上述程序相同。我们只是用 While 循环替换了 Python For 循环。
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程序：使用函数计算列表中奇偶数的数量
此计数奇偶列表数字的程序与第一个示例相同。但是，我们使用 函数分离了逻辑。
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