[Python] Can't add a field with an election

models.py:

from django.db import models


class Teacher(models.Model):
MATH = 'MT'
PHYS = 'PH'
COMP = 'CS'
SUBJECTS_TEACHER_CHOICES = {
MATH: 'Math',
PHYS: 'Phys',
COMP: 'Comp',
}
subjects = models.CharField(
max_length=2,
choices=SUBJECTS_TEACHER_CHOICES,
default=MATH,
)
first_name = models.CharField(max_length=128)


error: ERRORS:
TeachersApp.Teacher.subjects: (fields.E005) 'choices' must be an iterable containing (actual value, human readable name) tuples.


I want to add a field with choices.

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