No way to extract values from matplotlib charts

[lodowner-zz]

I saw the issue here #86 however it would be really useful if it were possible to extract the following from bar() or matrix():

a) A df or array of the names of all the columns with missing data from
b) A df or array of the % of data completness as show on y-axis of bar()

Is it possible to do this on a columnar basis as opposed to a row basis?
I attempted this using various matplotlib methods but to no avail.

[lodowner-zz]

That said, this could of course be achieved using;

df.isnull().sum().sort_values(ascending = False)

[ResidentMario]

Yes exactly. Dupe of #108.