GCK/ count occurences function for all possibles scores

from random import randint
import matplotlib.pyplot as plot


# generate random marks out of 10 to represent the results of the quiz taken by  a class
marks=[randint(0,10) for x in range(30) ]
# quiz scored out of 10
possible_scores=[x for x in range(11)]

def count_occurences(occurence,list_of_stuff):
    count=0
    for item in list_of_stuff:
        if item==occurence:
            count+=1
    print("{} appears {} times in the list".format(occurence,count))
    return count


def count_occurences_ofeach_tolist(possible_scores):
    list_of_scores=[]

    for score in possible_scores:
        count=count_occurences(score,marks)
        list_of_scores.append(count)

    return list_of_scores

list_of_scores=count_occurences_ofeach_tolist(possible_scores)
print(list_of_scores)

plot.barh(range(11), list_of_scores, align='edge', alpha=1.0, color="red",)

plot.xticks(range(11))
plot.xlabel('Score frequency')
plot.ylabel('Marks range')
plot.title('Scores of class from random generated marks')

plot.show()
plot.savefig(filename="Scores_chart_from_random_marks.png")