pandas count nan code example

Example 1: count nan pandas

#Python, pandas
#Count missing values for each column of the dataframe df

df.isnull().sum()

Example 2: dataframe find nan rows

df[df.isnull().any(axis=1)]

Example 3: find nan values in a column pandas

df.isnull().values.any()

Example 4: find nan values in a column pandas

df['your column name'].isnull().sum()

Example 5: 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 6: find nan value in dataframe python

# to mark NaN column as True
df['your column name'].isnull()