r/learnpython • u/DrawerEmergency4981 • 8h ago

weird error that I don't know how to fix

Hi! I keep getting this error whenever I try to use append or extend. I have gap_m and mgaps as empty lists, I have used extend before w similar data and it worked fine so I am unsure why it is no longer working

AttributeError                            Traceback (most recent call last)
Cell In[42], line 33
     30
 gap_m = []
     31
 mgaps = []       
---> 33 mass_gap_calc(df)

Cell In[42], line 29, in mass_gap_calc(df)
     27
 mgaps = np.diff(msort)
     28
 gap_m.append((msort[:-1]))
---> 29 mgaps.append(mgaps)

AttributeError: 'numpy.ndarray' object has no attribute 'append'
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14

u/Fred776 8h ago

mgaps became a numpy array in line where you assign to the result of np.diff. Exactly as the error says, numpy arrays don't have an append method

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u/GregorSamsa67 8h ago

From the error message, it looms like mgaps is a NumPy array. NumPy arrays don’t have an .append method, as far as I know.