To add percent of each slice. We write autopct='%1.1f%%'.. What is autopct actually and what is %1.1f%%

Question

Python . Matplotlib. Pie Chart related query.
Following is the code:
https://code.sololearn.com/c19b4VKk2BZI/?ref=app

Answer 1

It is used to take float values up-to tenth place after decimal as percentage for pie chart it is generally form of formatted string

Answer 2

can we write %1f%% instead of %1.1f%%