[Python] Create a dictionary that contains student name, roll no and marks obtained

I did a program to create a dictionary that contains student name, roll no and marks obtained.When I execute it to form multiple dictionaries instead of one. This is the code:

def student(x,y,z):
result = {}
result[roll_no] = [std_name, marks]
print(result)


n = int(input("Enter No of Students:"))
for i in range(n):

roll_no = int(input("Roll No: "))
std_name = input("Student Name: ")
marks = int(input("Marks: "))
student(std_name, roll_no, marks)

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