How to count the occurance of all elements of list in python?

Question

I have to write all the elements separately along with their count. It's the program i have made. It is counting correctly but not giving required output

The output is like this I want output to be like this. All digits showing individual complete count

In StackOverflow we don't put images of code, could you please paste your code here and mark it as `code` so that the syntax highlighter does its job. — fpopic, Nov 21 '19 at 19:55
Does this answer your question? [How to count the frequency of the elements in an unordered list?](https://stackoverflow.com/questions/2161752/how-to-count-the-frequency-of-the-elements-in-an-unordered-list) — Karl Knechtel, Jul 28 '22 at 03:34

score 2 · Answer 1 · edited Jun 20 '20 at 09:12

You can count the number of occurrence of a special element with count() method:

grades = ['b', 'b', 'f', 'c', 'b', 'a', 'a', 'd', 'c', 'd', 'a', 'a', 'b']
letters = ['a', 'b', 'c', 'd', 'f']

print(list(map(lambda letter: {letter: grades.count(letter)}, letters)))

Output:

[{'a': 4}, {'b': 4}, {'c': 2}, {'d': 2}, {'f': 1}]

If you want to do this without using letters. you can do this:

grades = ['b', 'b', 'f', 'c', 'b', 'a', 'a', 'd', 'c', 'd', 'a', 'a', 'b']

print(list(map(lambda letter: {letter: grades.count(letter)}, set(grades))))

Output:

[{'f': 1}, {'b': 4}, {'c': 2}, {'d': 2}, {'a': 4}]

For your expected output:

grades = ['b', 'b', 'f', 'c', 'b', 'a', 'a', 'd', 'c', 'd', 'a', 'a', 'b']

occurrence = map(lambda letter: (letter, grades.count(letter)), set(grades))

for item in occurrence:
    print(f"{item[0]}={item[1]}")

Output:

c=2
b=4
d=2
f=1
a=4

Update

You can use defaultdict() to count the occurrence of each element:

from collections import defaultdict

grades = ['b', 'b', 'f', 'c', 'b', 'a', 'a', 'd', 'c', 'd', 'a', 'a', 'b']
occurrence = defaultdict(lambda: 0)

for character in grades:
    occurrence[character] += 1

for key, value in occurrence.items():
    print(f"{key}={value}")

Output:

b=4
f=1
c=2
a=4
d=2

You can use ``defaultdict`` to count the occurrence of each element. I updated the answer. — Phoenix, Nov 22 '19 at 08:04

How to count the occurance of all elements of list in python?

1 Answers1

Update