df count nan values code example
Example 1: count nan pandas
#Python, pandas
#Count missing values for each column of the dataframe df
df.isnull().sum()
Example 2: find nan value in dataframe python
# to mark NaN column as True
df['your column name'].isnull()
Example 3: count rows with nan pandas
np.count_nonzero(df.isnull().values)
np.count_nonzero(df.isnull()) # also works