February 4, 2022

Programmingempire

The following code shows an example to Count Frequency of Elements in a List in Python. At first, we create a list containing duplicate elements. In order to find the frequency of each element, we need to find how many times an element appears in the list. Therefore, we create an empty list first. Further, we find the ith element in the original list in the new list. If the element is not there in the new list, we append it. Hence, in the new list, we get all the unique elements from the original list. Further, we start another loop that iterates over all elements in the new list. Here we create a counter for each element and assign it a value of 0. After that, we increment the counter for every occurrence of a particular element in the original list. Hence, we get the count of each element in the original list.

mylist=[12,1,3,54,12,12,3,3,3,5,6,3,54,3,2,54]
print('list elements: ')
for i in range(len(mylist)):
   print(mylist[i])
   

print('Counting element frequencies the list...')
list1=[]
for i in range(len(mylist)):
   f=False
   for j in range(len(list1)):
      if list1[j]==mylist[i]:
        f=True
   if f==False:
     list1.append(mylist[i])
         
for i in range(len(list1)):
   counter=0
   for j in range(len(mylist)):
      if list1[i]==mylist[j]:
        counter+=1
   print(str(list1[i])+' appears '+str(counter)+' times')

Output

Programmingempire

Further Reading