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:

```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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