python count non nan values in array code example

Example 1: how many nan in array python

np.count_nonzero(~np.isnan(data))

Example 2: count nan pandas

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

df.isnull().sum()

Example 3: check nan values in a np array

array_has_nan = np.isnan(array_sum)