count nan pandas
#Python, pandas
#Count missing values for each column of the dataframe df
df.isnull().sum()
                                
                            count nan pandas
#Python, pandas
#Count missing values for each column of the dataframe df
df.isnull().sum()
                                
                            count na pandas
>>> df = pd.DataFrame({"Person":
...                    ["John", "Myla", "Lewis", "John", "Myla"],
...                    "Age": [24., np.nan, 21., 33, 26],
...                    "Single": [False, True, True, True, False]})
>>> df
   Person   Age  Single
0    John  24.0   False
1    Myla   NaN    True
2   Lewis  21.0    True
3    John  33.0    True
4    Myla  26.0   False
df.count()
Person    5
Age       4
Single    5
dtype: int64
                                
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