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Python program to count positive and negative numbers in a list

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  • Last Updated : 08 Aug, 2022

Given a list of numbers, write a Python program to count positive and negative numbers in a List. 

Example:

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. 

Python3




# 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 += 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 

Python3




# 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 += 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 

Python3




# 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)

Output:

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

  Example #4 : Using List Comprehension 

Python3




# 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)

Output:

Positive numbers in the list:  1
Negative numbers in the list:  6

Method: Using enumerate function 

Python3




l=[12, -7, 5, 64, -14];c=0
x=[a for j,a in enumerate(l) if a>=0]
print("Length of Positive numbers is:", len(x))
print("Length of Nagetive numbers is:", len(l)-len(x))

Output

Length of Positive numbers is: 3
Length of Nagetive numbers is: 2

Method : Using startswith() method

Python3




# Python program to count positive and negative numbers in a List
 
# list of numbers
list1 = [10, -21, 4, -45, 66, -93, 1,0]
 
pos_count, neg_count = 0, 0
list2=list(map(str,list1))
 
# iterating each number in list
for num in list2:
    # checking condition
    if num.startswith("-"):
        neg_count += 1
    elif(num!="0"):
        if(not num.startswith("-")):
            pos_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

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