# Data Analysis with Python Projects - Mean-Variance-Standard Deviation Calculator

Data Analysis with python project - Mean-Variance-Standard Deviation Calculator
Hi, I’m getting this error
TypeError: unsupported operand type(s) for -: ‘dict’ and ‘dict’

Result:
{‘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, 1, 2], 0], ‘sum’: [[9, 12, 15], [3, 12, 21], 36]}

Expected:
{‘mean’: [[3.6666666666666665, 5.0, 3.0], [3.3333333333333335, 4.0, 4.333333333333333], 3.888888888888889], ‘variance’: [[9.555555555555557, 0.6666666666666666, 8.666666666666666], [3.555555555555556, 10.666666666666666, 6.222222222222221], 6.987654320987654], ‘standard deviation’: [[3.091206165165235, 0.816496580927726, 2.943920288775949], [1.8856180831641267, 3.265986323710904, 2.494438257849294], 2.6434171674156266], ‘max’: [[8, 6, 7], [6, 8, 7], 8], ‘min’: [[1, 4, 0], [2, 0, 1], 0], ‘sum’: [[11, 15, 9], [10, 12, 13], 35]}

This just means some of your output numbers don’t match. For example, you can see the last set doesn’t match Result vs. Expected:

‘sum’: [[9, 12, 15], [3, 12, 21], 36]}

‘sum’: [[11, 15, 9], [10, 12, 13], 35]}

The error generated is not too clear, unfortunately.

1 Like

Thanks for the solution. I had the same problem. The error generated is very misleading.

1 Like

This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.