In the data set, I have a column by name "bloodurea", "serumcreatine" and I need make a box plot. each column has 158 columns. bloodurea -( max - 310, min- 10, datatype - int), serumcreatine -(max- 10, min-0.5, datatype - float).

import pandas as pd

import matplotlib.pyplot as plt

df = pd.read_sql('SELECT * from INTROPROJECT',conn)

import numpy as np

df.boxplot(by ='bloodurea', column =['bloodurea'], grid = False)

this results in - unsupported operand type(s) for /: 'str' and 'int'