How to change the data of a particular column and multiply them depending upon the specific values in another column using pandas?

I want to select the year ‘2019/0′(string) from the column ‘year of entry’ and only multiply their ‘grades’ times 2 which is in another column

this is what I have tried so far:

df.loc[df("Year of Entry"),'2018/9'] = df("Grades")*2

its been giving me an error and im not sure if this is the right method.

>Solution :

You can use:

df.loc[df['year of entry'].eq('2019/0'), 'Grades'] *= 2

NB. the modification is in place.

modified df:

  year of entry  Grades
0        2019/0      28
1        2010/0      21
2        2019/0      30