4 5 Pandas Donneesmanquantes - Notebook by Philippe Bouaziz (yeonathan)

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import pandas as pd
import numpy as np

ar = np.array([0, 1, 2, 3])
ar

array([0, 1, 2, 3])

ar1 = np.array([0, 1, None, 3])
ar1

array([0, 1, None, 3], dtype=object)

ar.mean()

1.5

ar1.mean()

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-1a87881a998b> in <module>()
----> 1 ar1.mean()

~\AppData\Local\Continuum\anaconda3\lib\site-packages\numpy\core\_methods.py in _mean(a, axis, dtype, out, keepdims)
     73             is_float16_result = True
     74 
---> 75     ret = umr_sum(arr, axis, dtype, out, keepdims)
     76     if isinstance(ret, mu.ndarray):
     77         ret = um.true_divide(

TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'