Python程序可计算列表中的正数和负数 _列表

给定一个数字列表, 编写一个Python程序以计算列表中的正数和负数。
例子：

Input: list1 = [2, -7, 5, -64, -14] Output: pos = 2, neg = 3Input: list2 = [-12, 14, 95, 3] Output: pos = 3, neg = 1

范例1：使用for循环计算给定列表中的正数和负数
使用for循环遍历列表中的每个元素, 并检查num> = 0, 这是检查正数的条件。如果条件满足, 则增加pos_count, 否则增加neg_count。

# Python program to count positive and negative numbers in a List# list of numbers list1 = [ 10 , - 21 , 4 , - 45 , 66 , - 93 , 1 ]pos_count, neg_count = 0 , 0# iterating each number in list for num in list1:# checking condition if num > = 0 : pos_count + = 1else : neg_count + = 1print ( "Positive numbers in the list: " , pos_count) print ( "Negative numbers in the list: " , neg_count)

输出如下：

Positive numbers in the list:4 Negative numbers in the list:3

范例2：使用while循环

# Python program to count positive and negative numbers in a List# list of numbers list1 = [ - 10 , - 21 , - 4 , - 45 , - 66 , 93 , 11 ]pos_count, neg_count = 0 , 0 num = 0# using while loop while (num < len (list1)):# checking condition if list1[num] > = 0 : pos_count + = 1 else : neg_count + = 1# increment num num + = 1print ( "Positive numbers in the list: " , pos_count) print ( "Negative numbers in the list: " , neg_count)

输出如下：

Positive numbers in the list:2 Negative numbers in the list:5

Example＃3：使用Python Lambda表达式

# Python program to count positive # and negative numbers in a List# list of numbers list1 = [ 10 , - 21 , - 4 , 45 , 66 , 93 , - 11 ]neg_count = len ( list ( filter ( lambda x: (x < 0 ), list1)))# we can also do len(list1) - neg_count pos_count = len ( list ( filter ( lambda x: (x > = 0 ), list1)))print ( "Positive numbers in the list: " , pos_count) print ( "Negative numbers in the list: " , neg_count)

输出如下：

Positive numbers in the list:4 Negative numbers in the list:3

【Python程序可计算列表中的正数和负数】Example＃4：使用清单理解

# Python program to count positive # and negative numbers in a List# list of numbers list1 = [ - 10 , - 21 , - 4 , - 45 , - 66 , - 93 , 11 ]only_pos = [num for num in list1 if num > = 1 ] pos_count = len (only_pos)print ( "Positive numbers in the list: " , pos_count) print ( "Negative numbers in the list: " , len (list1) - pos_count)

输出如下：