Python program to print negative numbers in a list

In this article, we will explore multiple approaches to find and print negative numbers in a list.

Example:

Input: lst = [12, -7, 5, 64, -14]
Output: -7, -14

Using List Comprehension

List comprehension provides a compact way to filter negative numbers while keeping the code readable.

[-10, -5, -2]

Explanation:

• Iterates through each element in a.
• Adds the number to the new list negatives only if it is less than 0.

Using filter() Function

The filter() function allows filtering elements based on a condition efficiently.

[-3, -1, -9]

Explanation:

• lambda x: x < 0 defines lambda function returning True for negative numbers.
• filter(lambda x: x < 0, a): filters elements in list a that satisfy the condition x < 0.
• list(...): Converts the filtered result into a list.

Using a For Loop

A traditional for loop can be used to iterate through the list and print negative numbers directly.

-3
-1
-9

Explanation:

• "for loop" iterates through each element.
• "if num < 0" checks the condition if num is negative.
• Print the number if it is negative.

Using map() Function

Using map() is less straightforward since it requires handling None values for non-negative numbers.

[-3, -1, -9]

Explanation:

• map() applies a lambda function to each element.
• Non-negative numbers are converted to None.
• A list comprehension filters out None values.

Related Articles:

• Remove Negative Elements in List-Python
• Working with Negative Numbers in Python