写一个 Python 程序,用 For 循环、While 循环和函数计算列表中的正数和负数,并给出一个实例。
使用 For 循环计算列表中正数和负数的 Python 程序
在这个 python 程序中,我们使用 For 循环来迭代给定列表中的每个元素。在 Python for 循环中,我们使用 If 语句来检查和计数正数和负数。
# Python Program to Count Positive and Negative Numbers in a List
NumList = []
Positive_count = 0
Negative_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] >= 0):
Positive_count = Positive_count + 1
else:
Negative_count = Negative_count + 1
print("\nTotal Number of Positive Numbers in this List = ", Positive_count)
print("Total Number of Negative Numbers in this List = ", Negative_count)
在这个 python 程序中,用户输入了列表元素= [12,-22,3,5],正 计数= 0,负 计数= 0
对于循环–第一次迭代:对于范围(0,4) 中的 0,条件为真。因此,进入 If 语句T3 If(NumList[0]>= 0)=>If(12>= 0)–条件为真 正 计数=正 计数+ 1 = > 0 + 1 = 1
第二次迭代:对于范围(0,4)中的 1–条件为真 如果(NumList[1] > = 0) = >如果(-22>= 0)–条件为假,则进入 Else 块。 负 计数=负 计数+ 1 = > 0 + 1 = 1
第三次迭代:对于范围(0,4)中的 2–条件为真 如果(NumList[2] > = 0) = >如果(3>= 0)–条件为真 正 _ 计数= 1 + 1 = > 2
第四次迭代:对于范围(0,4)中的 3,如果(5>= 0)–条件为真,则条件为真 。所以,它进入了 Else 块。 阳性计数= 2 + 1 = > 3
第五次迭代:对于范围(4)中的 4–条件为假。所以,蟒蛇从 离开
Python 程序使用 While 循环计算列表中的正数和负数
这个计算正数和负数的 Python 程序与上面的相同。我们刚刚将 For Loop 替换为 While loop 。
# Python Program to Count Positive and Negative Numbers in a List
NumList = []
Positive_count = 0
Negative_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] >= 0):
Positive_count = Positive_count + 1
else:
Negative_count = Negative_count + 1
j = j + 1
print("\nTotal Number of Positive Numbers in this List = ", Positive_count)
print("Total Number of Negative Numbers in this List = ", Negative_count)
Python 使用 while 循环输出计算正负列表数
Please enter the Total Number of List Elements: 5
Please enter the Value of 1 Element : -3
Please enter the Value of 2 Element : -5
Please enter the Value of 3 Element : 9
Please enter the Value of 4 Element : 8
Please enter the Value of 5 Element : -6
Total Number of Positive Numbers in this List = 2
Total Number of Negative Numbers in this List = 3
使用函数计算列表中正负项目的 Python 程序
这个 Python 计算正负列表项目的程序与第一个示例相同。但是,我们使用函数来分离逻辑
def count_Positive(NumList):
Positive_count = 0
for j in range(Number):
if(NumList[j] >= 0):
Positive_count = Positive_count + 1
return Positive_count
def count_Negative(NumList):
Negative_count = 0
for j in range(Number):
if(NumList[j] % 2 != 0):
Negative_count = Negative_count + 1
return Negative_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)
Positive_cnt = count_Positive(NumList)
Negative_cnt = count_Negative(NumList)
print("\nTotal Number of Positive Numbers in this List = ", Positive_cnt)
print("Total Number of Negative Numbers in this List = ", Negative_cnt)
Please enter the Total Number of List Elements: 6
Please enter the Value of 1 Element : -11
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 Positive Numbers in this List = 3
Total Number of Negative Numbers in this List = 3