In this article we will discuss different ways to check if a given element exists in list or not.
Python Program to find out the position of an element in a list newlist ='A','K','Q','J','2','3','4','5','6','7','8','9','10' print(newlist.index('J')) If you run this program the output will be: $ python codespeedy.py 3. The above Python program is to find the index of an element in a list in Python. Now we will see how to find the position of an element in a list. Use the max Function to Find Max Value in a List in Python Python has a pre-defined function called max that returns the maximum value in a list. Finding the maximum value using max will only need a single line. Numbers = 55, 4, 92, 1, 104, 64, 73, 99, 20 maxvalue = max(numbers) print('Maximum value:', maxvalue). Python Find in List Using 'in' Python has a special operator called in. This operator checks to see whether a value is in a list. This operator is sometimes referred to as a 'membership operator' because it checks whether a value is a member of a list.
Suppose we have a list of strings i.e.
Now let's check if given list contains a string element ‘at' ,
Check if element exists in list using python 'in' Operator
Condition to check if element is in List :
It will return True, if element exists in list else return false.
For example check if ‘at' exists in list i.e.
Condition to check if element is not in List :
Check if element exist in list using list.count() function
count(element) function returns the occurrence count of given element in the list. If its greater than 0, it means given element exists in list.
Python Find Duplicates In List
Check if element exist in list based on custom logic
Python any() function checks if any Element of given Iterable is True.
Python Check If String Is In List
Let's use it to check if any string element in list is of length 5 i.e.
Instead of condition we can use separate function in any to match the condition i.e.
Complete example is as follows,
Output: