pandas use cell value to replace nan in 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: pandas if nan, then the row above
df.fillna(method='ffill')