count missing values in panda column code example

Example 1: count missing values by column in pandas

df.isna().sum()

Example 2: df count missing values

In [5]: df = pd.DataFrame({'a':[1,2,np.nan], 'b':[np.nan,1,np.nan]})

In [6]: df.isna().sum()
Out[6]:
a    1
b    2
dtype: int64

Example 3: find the number of nan per column pandas

In [1]: s = pd.Series([1,2,3, np.nan, np.nan])

In [4]: s.isna().sum()   # or s.isnull().sum() for older pandas versions
Out[4]: 2

Example 4: how to get the amount of nan values in a data fram

#where A is the name of the column
#where df is the name of the dataframe
count = df["A"].isna().sum()