Python program to count positive and negative numbers in a list
Given a list of numbers, write a Python program to count positive and negative numbers in a List.
Example:
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Input: list1 = [2, -7, 5, -64, -14] Output: pos = 2, neg = 3 Input: list2 = [-12, 14, 95, 3] Output: pos = 3, neg = 1
Example #1: Count positive and negative numbers from given list using for loop
Iterate each element in the list using for loop and check if num >= 0, the condition to check positive numbers. If the condition satisfies, then increase pos_count else increase neg_count.
# Python program to count positive and negative numbers in a List # list of numberslist1 = [10, -21, 4, -45, 66, -93, 1] pos_count, neg_count = 0, 0 # iterating each number in listfor num in list1: # checking condition if num >= 0: pos_count += 1 else: neg_count += 1 print("Positive numbers in the list: ", pos_count)print("Negative numbers in the list: ", neg_count) |
Output:
Positive numbers in the list: 4 Negative numbers in the list: 3
Example #2: Using while loop
# Python program to count positive and negative numbers in a List # list of numberslist1 = [-10, -21, -4, -45, -66, 93, 11] pos_count, neg_count = 0, 0num = 0 # using while loop while(num < len(list1)): # checking condition if list1[num] >= 0: pos_count += 1 else: neg_count += 1 # increment num num += 1 print("Positive numbers in the list: ", pos_count)print("Negative numbers in the list: ", neg_count) |
Output:
Positive numbers in the list: 2 Negative numbers in the list: 5
Example #3 : Using Python Lambda Expressions
# Python program to count positive# and negative numbers in a List # list of numberslist1 = [10, -21, -4, 45, 66, 93, -11] neg_count = len(list(filter(lambda x: (x < 0), list1))) # we can also do len(list1) - neg_countpos_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) |
Output:
Positive numbers in the list: 4 Negative numbers in the list: 3
Example #4 : Using List Comprehension
# Python program to count positive# and negative numbers in a List # list of numberslist1 = [-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) |
Output:
Positive numbers in the list: 1 Negative numbers in the list: 6
