Adding length of values of a column of a dataframe when each value is a list

Question

I have a dataframe that looks like this.

userID      upvotes 
abc1998     [abc1298]   
abc1998     [abc0369,abc9999]   
abc1998     []  
abc1998     []  
abc1998     []  
abc1998     [abc1991, abc1235]  
abc1998     [abc1992]   

I want to add the length of the list of each column of the row 'upvotes' and store it in a variable ie, the output should be sum = 1+2+0+0+0+2+1 = 6

Any help on this please?

Answer 1

df.upvotes.str.len().sum() This worked! Thanks @yatu