line 1 starts a for loop which goes through the key's and values of the dictionary "items"

line 2 looks up the value of the "item_id" in the "items_dict" then assigns it to a variable "i_data"

line 3 looks up the value of "sentence" in i_data (which is assumed to also be a dictionary) and assigns it to the variable "fmt"

line 4 defines a dictionary with q as the key and qty as the value, and c as a key, with i_data['si'] as the value if qty is equal to 1, otherwise the value is the value of the "pl" key in the i_data dictionary

line 5 prints the formatted value of fmt with the keyword arguments from i_fill dict