pandas where retuning 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: python pandas replace nan with null

df.fillna('', inplace=True)

Example 3: find nan values in a column pandas

df['your column name'].isnull().values.any()

Example 4: find nan values in a column pandas

df.isnull().sum().sum()

Example 5: pandas where retuning NaN

# Try using a loc instead of a where:
df_sub = df.loc[df.yourcolumn == 'yourvalue']