pandas replace nas in a column with values from another column code example

Example 1: pandas replace null values with values from another column

#Python
#Col 1 = where you want the values replaced
#Col 2 = where you want to take the values from
df.["Col 1"].fillna(df.["Col 2"], inplace=True)

Example 2: replace values of pandas column

df.loc[df['column'] == 'column_value', 'column'] = 'new_column_value'