Pandas: How to calculate the percentage of one column against another?
df['percentage columns'] = (df['Number of Green Marbles']) / (df['Total Number of Marbles'] ) * 100
I am just trying to calculate the percentage of one column against another's total, but I am unsure how to do this in Pandas so the calculation gets added into a new column.
Let's say, for argument's sake, my data frame has two attributes:

Number of Green Marbles
Total Number of Marbles

Now, how would I calculate the percentage of the Number of Green Marbles out of the Total Number of Marbles in Pandas?
Obviously, I know that the calculation will be something like this:

(Number of Green Marbles / Total Number of Marbles) * 100

Thanks - any help is much appreciated!