关于 Python 上的方法和 2d arrays 的问题

Question

this is my first ever post and I'm a non-native english speaker so please try to be patient to me!

I'm having a issue regarding the use of 2d arrays on Python. The thing is that I need a program able to receive student's names and their grades for a set number of subjects, student's names must be saved to an 1d array and their grades must be saved to another 1d array. Also the number of students and the name of each subject as their number must be issued by the user. My problem is that when it's the time to inform the user of the mean grade for each student and the mean grade for each subject the names don't add up with the resulting mean (I mean the resulting numbers are correct but they don't belong to the user/subject shown in the output). I was also told to not use any libraries other than statistics and those native to Python (it's a college assignment). I attach my code (it's in spanish, might translate it if needed) to anyone who is looking forward to help me. Thanks in advance!

    print("******Instituto Técnico de Contaduría*******")

m=int(input("Ingrese la cantidad de estudiantes de la carrera Técnico en Contaduría: "))
n=int(input("Ingrese la cantidad de asignaturas: "))

est=[None]*m
mat=[None]*n
notasfinales=[[0.0 for x in range(n)] for y in range (m)]

for i in range (m):
      est[i]=str(input("Digite el nombre completo del(la) estudiante: "))

for j in range(n):
      mat[j]=str(input("Digite el nombre de la asignatura: "))


for i in range(m):
      print("*****Digite las notas del estudiante " + est[i] + "*****")
      for j in range(n):
          notasfinales[i][j]=float(input("Digite las notas de la asignatura " + mat[j] + "\n "))


print("****Promedio de notas por estudiante******")
for i in range(m):
    sumaFil=0
    for j in range(n):
        sumaFil= sumaFil + notasfinales[i][j]


    for i in range(m):
        pe=sumaFil/n

    print("El promedio del(la) estudiante " + est[i]  + " es " + str(pe))

print("****Promedio de notas por asignatura******")
for j in range(n):
    sumaCol=0
    for i in range(m):
        sumaCol= sumaCol + notasfinales[i][j]

    for j in range(n):
        pa=sumaCol/m

    print("El promedio de la asignatura " + mat[j]  + " es " + str(pa))

Answer 1

You are re-using and overwriting the same variable name in your final code section. I highlight the issues here:

print("****Promedio de notas por estudiante******")
for i in range(m): # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< first usage of i
    sumaFil=0
    for j in range(n):
        sumaFil= sumaFil + notasfinales[i][j]

    for i in range(m): # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< overwrite i
        pe=sumaFil/n

    print("El promedio del(la) estudiante " + est[i]  + " es " + str(pe))

print("****Promedio de notas por asignatura******")
for j in range(n): # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< first usage of j
    sumaCol=0
    for i in range(m):
        sumaCol= sumaCol + notasfinales[i][j]

    for j in range(n): # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< overwrite j
        pa=sumaCol/m

    print("El promedio de la asignatura " + mat[j]  + " es " + str(pa))