Execute equation from the elements of a list in python

March 1, 2023

I have the following list and dataframe:

import pandas as pd
data = [[5, 10, 40], [2, 15, 70], [6, 14, 60]]
df = pd.DataFrame(data, columns=['A', 'B', 'C'])
lst = [5, '*', 'A', '+', 'C']

And I would like to create a code to execute the equation in the lst like 5 x A + C returning the following result:

data = [[65], [80], [90]]
dresult = pd.DataFrame(data, columns=['M'])

Is that possible?

>Solution :

Yes. You simply do this:

import pandas as pd

data = [[5, 10, 40], [2, 15, 70], [6, 14, 60]]
df = pd.DataFrame(data, columns=['A', 'B', 'C'])
lst = [5, '*', 'A', '+', 'C']

expression = ' '.join(str(e) for e in lst)

dresult = pd.DataFrame()
dresult['M'] = df.eval(expression)

print(dresult)

which is: