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Find Element In List Python

Last Updated : Sep 11, 2023

Find Element In List Python

In this article we will show you the solution of find element in list python, in Python, the concept of locating an element in a list entails looking for a particular value or item within a given list.

For effectively doing this work, Python offers a number of approaches and techniques.

The "in" operator is a frequently used technique that determines whether an element is present in the list and then returns a Boolean result (True or False) in accordance.

The "index()" function, which returns the index of the first instance of the supplied element in the list, is another often-used technique.

If the element cannot be located, a ValueError is raised. When you need to know where an element is in the list, this method is really helpful. Now move to the concept of find element in list python.

Step By Step Guide On Find Element In List Python :-

def find_element_in_list(element, lst):
    # Using 'in' operator
    if element in lst:
        return True
        return False
def find_element_index(element, lst):
        index = lst.index(element)
        return index
    except ValueError:
        return -1
def find_element_with_loop(element, lst):
    for i in range(len(lst)):
        if lst[i] == element:
            return i
    return -1
# Example usage:
my_list = [1, 2, 3, 4, 5, 6]
# Using 'in' operator
print(find_element_in_list(3, my_list)) # Output: True
# Using index() function
print(find_element_index(5, my_list)) # Output: 4
# Using a loop
print(find_element_with_loop(2, my_list)) # Output: 1
  1. In the starting of the code e use the 'in' operator in the function find_element_in_list(element, lst) to determine whether the given element is present in the lst.
  2. This check is carried out by determining whether the element is present in the lst.
  3. We return True to denote that the element is present if it is discovered in the lst.
  4. If the element is not found, we return False to signal as much.
  5. We use the index() function in the method find_element_index(element, lst) to attempt to locate the index of the given element within the lst.
  6. To deal with the potential for a ValueError, we employ a try-except block.
  7. To find the element's index, we call the index() method on the lst inside the try block.
  8. If the element is located, the index value is returned.
  9. However, we catch the exception in the unless block and return -1 to show that the element is not there in the lst if the element cannot be retrieved and the index() function throws a ValueError.
  10. We use a for loop to repeatedly iterate over the lst's range of indices in the function find_element_with_loop(element, lst).
  11. We determine whether the current element (lst[i]) and the targeted element are equal at the end of each iteration.
  12. If a match is made, we return the element's position in the lst as the current index (i).
  13. The element is not found in the lst if we finish the loop without finding a match, thus we return -1.
  14. In the usage example, we define a list named my_list that contains a few elements.
  15. We try to search the entries of my_list using each of the three functions.
  16. To the respective function calls, we supply the my_list and the element to search for as arguments.
  17. The results of each function call are displayed using the print() function at the end, showing if the elements were located and, if necessary, their locations.

Conclusion :-

As a result, we were able to understand the locate element in list Python notion.

We also discovered how to find entries in a list in Python using the 'in' operator, index() function, and loop.

These methods offer versatility and effectiveness when looking for particular values within a list.

I hope this article on find element in list python helps you and the steps and method mentioned above are easy to follow and implement.

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