bar_graph.py

import random                                 #import from the random function
import matplotlib.pyplot as plot

grades = []                                   #create empty list called grades
tens = []                                     #create empty list called tens
lowscore = []
for x in range(0, 30):                        # loop range 30
    grades.append(random.randint(0,10))       #append in grades a random number 0 - 10

print(grades)


for item in grades:                           #for every item in grades, if equal to 10, put in tens list
    if item == 10:
        tens.append(item)
    elif item <= 3:
        lowscore.append(item)                #for every itme in grades if lower then 3 put in lowscore list

print(tens)
top_scorers = len(tens)                       #top_scorers is equal to the length of tens list(int)
low_scorers = len(lowscore)                   #low_scorers is equal to the length of lowscore list
print(" {} student/s have scored the perfect score".format(top_scorers))
print(" {} student/s have scored lower then 3".format(low_scorers))




def chart(performance):
    plot.bar(range(11), performance, align='center', alpha=0.5)
    plot.xticks(range(11))
    plot.ylabel('Score frequency')
    plot.title('Scores on a quiz')
    plot.show()
    plot.savefig(fname="Quiz Chart.png")

chart(grades)