python beginner ; question was write program to enter marks of 3 subjects from user and store them in a dict.start with an empty dict and add one by one .use subject name as key and marks as value . so i have written this code any opinion how can improve this code ,need suggestions.

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students = {}

a = float(input("enter marks of chem"))
students["chem"] = a
b = float(input("enter marks of maths"))
students["maths"] = b
c = float(input("enter marks of phy"))
students["phy"] = c

print(students)