“After running your code, use the variable inspector to look at the difference between
Actually there are no any values for No OS and macOS in value_counts_after. I can not see any reason why. Please could you help me and explain why they are missing?
Hi @0bdf48d394cc45dc. On this screen (mission link) we’re trying to fill in some of the null values in the
os_version column based on information from the
os column. We replaced all the null values in the
os_version column in the rows with either
No OS in the
os column. When we run the code for the variable
value_counts_after, we’re looking for the null values that are still remaining in the
os_version column for each OS. Since we filled in the values for
No OS, we should expect not to see them in our
value_counts_after variable. If we did, it would mean that we missed something and didn’t get those null values filled in properly.
I hope that helps!
I see, Thank you very much!