How can i calculate the sum of numbers in a nested dict. in python

October 9, 2022

How can i calculate the sum or total points of numbers of this nested dict. in python

i tried alot of things and it didn’t work all time get the last value in the loop not every grade or value.
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# Input


students = {
  "Ahmed": {
    "Math": "A",
    "Science": "D",
    "Draw": "B",
    "Sports": "C",
    "Thinking": "A"
  },
  "Sayed": {
    "Math": "B",
    "Science": "B",
    "Draw": "B",
    "Sports": "D",
    "Thinking": "A"
  },
  
}

grades = {
  "A": 100,
  "B": 80,
  "C": 40,
  "D": 20
}



for main_key, main_value in students.items():
  print("------------------------------")
  print(f"-- Student Name => {main_key}")
  print("------------------------------")

  for subject, rank in main_value.items():
    print(f"- {subject} => {grades[rank]} Points")
  else:  
    # Can't caculate the total points
    print(f"Total Points For {main_key} Is ###")









# Needed Output
"------------------------------"
"-- Student Name => Ahmed"
"------------------------------"
"- Math => 100 Points"
"- Science => 20 Points"
"- Draw => 80 Points"
"- Sports => 40 Points"
"- Thinking => 100 Points"
"Total Points For Ahmed Is 340"
"------------------------------"
"-- Student Name => Sayed"
"------------------------------"
"- Math => 80 Points"
"- Science => 80 Points"
"- Draw => 80 Points"
"- Sports => 20 Points"
"- Thinking => 100 Points"
"Total Points For Sayed Is 360"

>Solution :

You can do it like this:

students = {
  "Ahmed": {
    "Math": "A",
    "Science": "D",
    "Draw": "B",
    "Sports": "C",
    "Thinking": "A"
  },
  "Sayed": {
    "Math": "B",
    "Science": "B",
    "Draw": "B",
    "Sports": "D",
    "Thinking": "A"
  },
  
}

grades = {
  "A": 100,
  "B": 80,
  "C": 40,
  "D": 20
}



for main_key, main_value in students.items():
  print("------------------------------")
  print(f"-- Student Name => {main_key}")
  print("------------------------------")

  for subject, rank in main_value.items():
    print(f"- {subject} => {grades[rank]} Points")
  else:  
    print(f"Total Points For {main_key} Is {sum(grades[grade] for grade in main_value.values() if grade)}")

The output of the code will be, which matches your desired output:

------------------------------
-- Student Name => Ahmed
------------------------------
- Math => 100 Points
- Science => 20 Points
- Draw => 80 Points
- Sports => 40 Points
- Thinking => 100 Points
Total Points For Ahmed Is 340
------------------------------
-- Student Name => Sayed
------------------------------
- Math => 80 Points
- Science => 80 Points
- Draw => 80 Points
- Sports => 20 Points
- Thinking => 100 Points
Total Points For Sayed Is 360

Hope it helps.