[Python] MOOC - Students database (Errors when submitting)

My code is working now. I tested it with the examples MOOC gives and all is good, but I got errors when I try to submit. Any ideas?

I don't know what to do. I think its something wrong with the code after the if name section.

My code:

def add_student(database: dict, name: str):
if name in database:
print("This student exists already")

database[name] = {}

def add_course(database: dict, name: str, course: tuple):
if course[1] == 0:
return
if course[0] not in database[name]:
students[name][course[0]] = course[1]
return
if course[1] > database[name][course[0]]:
database[name][course[0]] = course[1]
return

def print_student(database: dict, name: str):
if name not in database:
print(f"{name}: no such person in the database")
else:
if len(database[name]) == 0:
print(f"{name}:")
print(" no completed courses")
else:
completed_courses = len(database[name])
sum_grades = 0
print(f"{name}:")
print(f" {completed_courses} completed courses:")
for courses, grades in database[name].items():
sum_grades += grades
avg_grade = sum_grades / len(database[name])
print(f" {courses} {grades}")
print(f" average grade {avg_grade}")

def summary(database: dict):
students = len(database)
courses_completed = 0
best_avg = 0
most_courses = ""
for student in database:
total_grade = 0
for course, grade in database[student].items():
total_grade += grade
avg_grade = total_grade / len(database[student])
if avg_grade > best_avg:
best_avg = avg_grade
if len(database[student]) > courses_completed:
courses_completed = len(database[student])
most_courses = student
print(f"students {students}")
print(f"most courses completed {courses_completed} {most_courses}")
print(f"best average grade {student} {best_avg}")



if __name__ == "__main__":
students = {}
add_student()
add_course()
print_student()
summary()


I got a lot of errors when I submit. Examples:



I'm expecting no errors because the code is working.

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