How to create a accumulator

Question

I have a few classes I want to display number of approved students.

What I’ve already done

nota= a 

if nota >= 60 and nota < 100:     
   

else:

Exit approved 20 failed 50, but I have seventy students. How to do?

Answer 1

If you have a list of students' grades in the classes, just check how many values are greater than 60. You can do this with the function len() and filter notes using list comprehension:

notas = [60, 75, 55, 86, 97, 90, 59]
qtd_aprovados = len([nota for nota in notas if nota >= 60])

print(f'Foram aprovados {qtd_aprovados} alunos')

For this example, it will appear that 5 students have been approved.

Answer 2

There are a few different ways of doing this, but as I think you’re getting started, the idea would be to visualize each step of structure used to understand.

An initial way would be to have a list, or some other data structure to have all the notes. Using list would be something like this

notas = [95, 60, 50, 30, 20, 10]

Then create two variables to store the totals for approved and disapproved, which can be done as follows

total_aprovados = 0, total_reprovados = 0

Use an iterative structure so that you can retrieve and identify each element of your list and for each note check according to the necessary condition

for nota in notas:
    if nota >= 60 and nota < 100:
    else:

Depending on the outcome of these conditionals increment the values of the variables

total_aprovados = total_aprovados + 1 ou total_reprovados = total_reprovados + 1

Putting it all together would be like this

notas = [95, 60, 50, 30, 20, 10]
total_aprovados = 0
total_reprovados = 0

for nota in notas:
    if nota >= 60 and nota < 100:
        total_aprovados = total_aprovados + 1
    else:
        total_reprovados = total_reprovados + 1

print('Total aprovados = {0}, Total reprovados = {1}'.format(total_aprovados, total_reprovados))

Answer 3

There is the possibility that if students are inserted in a dictionary, and facilitates the consultation of who are the students failed.

Follow this example below, here I limited the students up to 5 and entered them manually but you can change to your need without problems.

alunos = {}
aprovados = []
reprovados = []

i = 0
qtd = 5

while i < qtd:
    aluno = str(input('Digite o nome do Aluno: '))
    nota = float(input('Digite a nota do Aluno: '))

    alunos[aluno]=nota
    i += 1

    if nota >= 60 and nota < 100:
        aprovados.append(aluno)

    else:
        reprovados.append(aluno)

print(alunos)
print(f'Os alunos aprovados foram {aprovados} e são um total de {len(aprovados)}')
print(f'Os alunos aprovados foram {reprovados} e são um total de {len(reprovados)}')