# Problem with Mean-Variance-Standard Deviation Calculator projetct

Tell us what’s happening:
Describe your issue in detail here.

Hi! Im new in this plataform, hope to get along with everyone!
So for my issue, i’m getting this error and i dont know what to do anymore

``````python main.py
{'mean': ([[3.0, 4.0, 5.0], [1.0, 4.0, 7.0], 4.0],), 'variance': ([[6.0, 6.0, 6.0], [0.6666666666666666, 0.6666666666666666, 0.6666666666666666], 6.666666666666667],), 'standard deviation': ([[2.449489742783178, 2.449489742783178, 2.449489742783178], [0.816496580927726, 0.816496580927726, 0.816496580927726], 2.581988897471611],), 'max': ([[6, 7, 8], [2, 5, 8], 8],), 'min': [[0, 1, 2], [0, 3, 6], 0], 'sum': [[9, 12, 15], [3, 12, 21], 36]}
EE.
======================================================================
ERROR: test_calculate (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/boilerplate-mean-variance-standard-deviation-calculator-1/test_module.py", line 10, in test_calculate
self.assertAlmostEqual(actual, expected, "Expected different output when calling 'calculate()' with '[2,6,2,8,4,0,1,5,7]'")
File "/usr/lib/python3.8/unittest/case.
 python main.py
{'sum': [[9, 12, 15], [3, 12, 21], 36]}
EE.
======================================================================
ERROR: test_calculate (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/boilerplate-mean-variance-standard-deviation-calculator-1/test_module.py", line 10, in test_calculate
self.assertAlmostEqual(actual, expected, "Expected different output when calling 'calculate()' with '[2,6,2,8,4,0,1,5,7]'")
File "/usr/lib/python3.8/unittest/case.
 python main.py
{'sum': [[9, 12, 15], [3, 12, 21], 36]}
EE.
======================================================================
ERROR: test_calculate (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/boilerplate-mean-variance-standard-deviation-calculator-1/test_module.py", line 10, in test_calculate
self.assertAlmostEqual(actual, expected, "Expected different output when calling 'calculate()' with '[2,6,2,8,4,0,1,5,7]'")
File "/usr/lib/python3.8/unittest/case.
 python main.py
{'mean': ([[3.0, 4.0, 5.0], [1.0, 4.0, 7.0], 4.0],), 'variance': ([[6.0, 6.0, 6.0], [0.6666666666666666, 0.6666666666666666, 0.6666666666666666], 6.666666666666667],), 'standard deviation': ([[2.449489742783178, 2.449489742783178, 2.449489742783178], [0.816496580927726, 0.816496580927726, 0.816496580927726], 2.581988897471611],), 'max': ([[6, 7, 8], [2, 5, 8], 8],), 'min': [[0, 1, 2], [0, 3, 6], 0], 'sum': [[9, 12, 15], [3, 12, 21], 36]}
EE.
======================================================================
ERROR: test_calculate (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/boilerplate-mean-variance-standard-deviation-calculator-1/test_module.py", line 10, in test_calculate
self.assertAlmostEqual(actual, expected, "Expected different output when calling 'calculate()' with '[2,6,2,8,4,0,1,5,7]'")
File "/usr/lib/python3.8/unittest/case.
 python main.py
{'mean': ([[3.0, 4.0, 5.0], [1.0, 4.0, 7.0], 4.0],), 'variance': ([[6.0, 6.0, 6.0], [0.6666666666666666, 0.6666666666666666, 0.6666666666666666], 6.666666666666667],), 'standard deviation': ([[2.449489742783178, 2.449489742783178, 2.449489742783178], [0.816496580927726, 0.816496580927726, 0.816496580927726], 2.581988897471611],), 'max': ([[6, 7, 8], [2, 5, 8], 8],), 'min': [[0, 1, 2], [0, 3, 6], 0], 'sum': [[9, 12, 15], [3, 12, 21], 36]}
EE.
======================================================================
ERROR: test_calculate (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/boilerplate-mean-variance-standard-deviation-calculator-1/test_module.py", line 10, in test_calculate
self.assertAlmostEqual(actual, expected, "Expected different output when calling 'calculate()' with '[2,6,2,8,4,0,1,5,7]'")
File "/usr/lib/python3.8/unittest/case.py", line 943, in assertAlmostEqual
diff = abs(first - second)
TypeError: unsupported operand type(s) for -: 'dict' and 'dict'

======================================================================
ERROR: test_calculate2 (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/boilerplate-mean-variance-standard-deviation-calculator-1/test_module.py", line 15, in test_calculate2
self.assertAlmostEqual(actual, expected, "Expected different output when calling 'calculate()' with '[9,1,5,3,3,3,2,9,0]'")
File "/usr/lib/python3.8/unittest/case.py", line 943, in assertAlmostEqual
diff = abs(first - second)
TypeError: unsupported operand type(s) for -: 'dict' and 'dict'

----------------------------------------------------------------------
Ran 3 tests in 0.025s

FAILED (errors=2)
``````

I’ve looked into most of the forum posts and none of the solutions work for me

Your code so far

``````import numpy as np

def calculate(list):
try:
array = np.array(list).reshape(3, 3)

except:
raise ValueError('List must contain nine numbers.')

calculations = {}

calculations['mean'] = [
array.mean(axis = 0).tolist(),
array.mean(axis = 1).tolist(),
array.mean()
],

calculations['variance'] = [
array.var(axis = 0).tolist(),
array.var(axis = 1).tolist(),
array.var()
],

calculations['standard deviation'] = [
array.std(axis = 0).tolist(),
array.std(axis = 1).tolist(),
array.std()
],

calculations['max'] = [
array.max(axis = 0).tolist(),
array.max(axis = 1).tolist(),
array.max()
],

calculations["min"] = [
array.min(axis = 0).tolist(),
array.min(axis = 1).tolist(),
array.min()
]

calculations["sum"] = [
array.sum(axis = 0).tolist(),
array.sum(axis = 1).tolist(),
array.sum()
]

return calculations
``````

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Challenge: Mean-Variance-Standard Deviation Calculator

Link to the challenge:

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1 Like

Read again that problem. They said, Solution should be in the format—

1. Sum
2.variance
2. Standard Deviation

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