Python | Values till False element

Python | Values till False element

In this tutorial, we'll discuss how to extract elements from a list until a False element is encountered. This is a common problem where you want to read values in a list until a certain condition (in this case, a False value) breaks the sequence.

Objective:

Given a list containing mixed data types (including booleans), extract all values from the start of the list up to (but not including) the first False value.

Example:

Given the list:

data = [1, "apple", True, 3.5, False, "banana", True]

We want to extract all elements until the first False is encountered. The desired output would be:

[1, "apple", True, 3.5]

Steps:

  1. Initialize an Empty List: Start with an empty list to store the extracted values.

  2. Iterate Through the List: Loop through each element in the list.

  3. Check Each Element: For each element, if it's False, break the loop. Otherwise, add it to the result list.

Code:

Here's how to implement the above steps:

def extract_values_till_false(data): result = [] for item in data: if item is False: break result.append(item) return result # Test the function data = [1, "apple", True, 3.5, False, "banana", True] print(extract_values_till_false(data)) # Output: [1, "apple", True, 3.5]

Explanation:

  • The function extract_values_till_false takes a list (data) as its input.

  • We loop through each item in the list. If the item is False, we break out of the loop immediately. Otherwise, we append the item to the result list.

Conclusion:

This tutorial showed how to extract values from a list up to the first False element. It can be adapted for other conditions or stopping criteria by modifying the loop's breaking condition.

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