Python 程序：統計列表中正數和負數

寫一個 Python 程序，用 For 循環、While 循環和函數計算列表中的正數和負數，並給出一個實例。

使用 For 循環計算列表中正數和負數的 Python 程序

在這個 python 程序中，我們使用 For 循環來迭代給定列表中的每個元素。在 Python for 循環中，我們使用 If 語句來檢查和計數正數和負數。

# 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)

在這個 python 程序中，用戶輸入了列表元素= [12，-22，3，5]，正 計數= 0，負 計數= 0

對於循環–第一次迭代:對於範圍(0，4)
中的 0，條件為真。因此，進入 If 語句T3 If(NumList[0]>= 0)=>If(12>= 0)–條件為真
正 計數=正 計數+ 1 = > 0 + 1 = 1

第二次迭代:對於範圍(0，4)中的 1–條件為真
如果(NumList[1] > = 0) = >如果(-22>= 0)–條件為假，則進入 Else 塊。
負 計數=負 計數+ 1 = > 0 + 1 = 1

第三次迭代:對於範圍(0，4)中的 2–條件為真
如果(NumList[2] > = 0) = >如果(3>= 0)–條件為真
正 _ 計數= 1 + 1 = > 2

第四次迭代:對於範圍(0，4)中的 3，如果(5>= 0)–條件為真，則條件為真
。所以，它進入了 Else 塊。
陽性計數= 2 + 1 = > 3

第五次迭代:對於範圍(4)中的 4–條件為假。所以，蟒蛇從 離開

Python 程序使用 While 循環計算列表中的正數和負數

這個計算正數和負數的 Python 程序與上面的相同。我們剛剛將 For Loop 替換為 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 循環輸出計算正負列表數

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

使用函數計算列表中正負項目的 Python 程序

這個 Python 計算正負列表項目的程序與第一個示例相同。但是，我們使用函數來分離邏輯

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