﻿ Python Math: Calculate the difference between the squared sum and the sum of the squared of first n natural numbers - w3resource # Python Math: Calculate the difference between the squared sum and the sum of squared of first n natural numbers

## Python Math: Exercise-11 with Solution

Write a Python program to calculate the difference between the squared sum of first n natural numbers and the sum of squared first n natural numbers.(default value of number=2).

Sample Solution:-

Python Code:

``````def sum_difference(n=2):
sum_of_squares = 0
square_of_sum = 0
for num in range(1, n+1):
sum_of_squares += num * num
square_of_sum += num

square_of_sum = square_of_sum ** 2

return square_of_sum - sum_of_squares

print(sum_difference(12))
```
```

Sample Output:

```5434
```

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## Python: Tips of the Day

Python: Get the Key Whose Value Is Maximal in a Dictionary

```>>> model_scores = {'model_a': 100, 'model_z': 198, 'model_t': 150}
>>> # workaround
>>> keys, values = list(model_scores.keys()), list(model_scores.values())
>>> keys[values.index(max(values))]
'model_z'
>>> # one-line
>>> max(model_scores, key=model_scores.get)
'model_z'
```