# Kurtosis of all rows for specific range of columns
df['kurt'] = df.iloc[:,<col_num_start>:<col_num_end>].kurtosis(axis = 1)
# Kurtosis of all rows for specific columns
df['kurt'] = df.iloc[:,[<col_1>,<col_2>,<col_3>].kurtosis(axis = 1)
# Specify the columns in a list by number