How do you count occurrences of each element in a list python?
Given a list in Python and a number x, count the number of occurrences of x in the given list. Show
Examples: Input: lst = [15, 6, 7, 10, 12, 20, 10, 28, 10], x = 10 Output: 3 Explanation: 10 appears three times in given list. Input: lst = [8, 6, 8, 10, 8, 20, 10, 8, 8], x = 16 Output: 0 Explanation: 16 appears zero times in given list. Method 1: Count occurrences of an element in a list Using a Loop in PythonWe keep a counter that keeps on increasing if the required element is found in the list. Python3
Output: 8 has occurred 5 times Method 2: Count occurrences of an element in a list Using count()The idea is to use the list method count() to count the number of occurrences. Python3
Output: 8 has occurred 5 times Method 3: Count occurrences of an element in a list Using Counter()The counter method returns a dictionary with occurrences of all elements as a key-value pair, where the key is the element and the value is the number of times that element has occurred. Python3
Output: 3 has occurred 2 times Method 4: Count occurrences of an element in a list Using countof()Operator.countOf() is used for counting the number of occurrences of b in a. It counts the number of occurrences of value. It returns the Count of a number of occurrences of value. Python3
Output: 2 has occurred 3 times Method 5: Count occurrences of an element in a list Using dictionary comprehensionPython allows dictionary comprehensions. We can create dictionaries using simple expressions. A dictionary comprehension takes the form {key: value for (key, value) in iterable} Python3
Output: 1 Method 6: Count occurrences of an element in a list Using the panda’s libraryPandas Series.value_counts() function return a Series containing counts of unique values. The resulting object will be in descending order so that the first element is the most frequently-occurring element. Python3
Output: Element Count 2 3 1 2 3 2 4 2 5 2 dtype: int64 Method: Using list comprehensionPython3
Output the element 1 occures 2 times |