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Python program to count positive and negative numbers in a list
• Last Updated : 26 Oct, 2018

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.

 `# 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

 `# 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

 `# 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

 `# 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
```

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