Mean-Variance-STD Calculator error

Python
1

hi all!

i wrote out the code for the mvstd calculator and i’m getting two errors returned to me from the unittest. both are ‘unsupported operand type(s) for -: ‘dict’ and ‘dict’’. i’ve tried to google to get some understanding but to no avail.

here’s the code:


import numpy as np

def calculate(list):
  calculations = {
  'mean': [],
  'variance': [],
  'standard deviation': [],
  'max': [],
  'min': [],
  'sum': []}

  if len(list) != 9:
    raise ValueError('List must contain nine numbers.')
  else:
    matrix = (np.array(list, dtype=float).reshape((3,3)))

  # mean
  calculations['mean'].append(np.mean(matrix, axis=0, dtype=float).tolist())
  calculations['mean'].append(np.mean(matrix, axis=1, dtype=float).tolist())
  calculations['mean'].append(np.mean(list).tolist())

  # variance
  calculations['variance'].append(np.var(matrix, axis=0, dtype=float).tolist())
  calculations['variance'].append(np.var(matrix, axis=1, dtype=float).tolist())
  calculations['variance'].append(np.mean(list).tolist())

  # standard deviation
  calculations['standard deviation'].append(np.std(matrix, axis=0, dtype=float).tolist())
  calculations['standard deviation'].append(np.std(matrix, axis=1, dtype=float).tolist())
  calculations['standard deviation'].append(np.std(list).tolist())
  
  # max
  calculations['max'].append(np.max(matrix, axis=0).tolist())
  calculations['max'].append(np.max(matrix, axis=1).tolist())
  calculations['max'].append(np.max(list).tolist())

  # min
  calculations['min'].append(np.min(matrix, axis=0).tolist())
  calculations['min'].append(np.min(matrix, axis=1).tolist())
  calculations['min'].append(np.min(list).tolist())
  
  # sum
  calculations['sum'].append(np.sum(matrix, axis=0, dtype=int).tolist())
  calculations['sum'].append(np.sum(matrix, axis=1, dtype=int).tolist())
  calculations['sum'].append(np.sum(list).tolist())

  return calculations

print(calculate([9,1,5,3,3,3,2,9,0]))

thanks!

2

Welcome to the forums, @jon.cokl .

The third one is not like the others.

3

oh my god.

…thank you so much. ahaha.

4

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