This code creates a dictionary `d` that groups phone numbers...
This code creates a dictionary d
that groups phone numbers by their country code.
First, it defines a list of phone numbers called phone_numbers
.
Next, it initializes an empty dictionary d
.
Then, it loops through each phone number in the phone_numbers
list. For each number, it extracts the first two characters (i.e. the country code) and assigns it to the variable code
.
It then adds the phone number to the dictionary d
using setdefault
, which retrieves the value for the key code
. If the key does not exist, it sets the default value as an empty list []
. It then appends the phone number to the list associated with the key code
.
Finally, it sorts the items in the dictionary in ascending order by their keys (i.e. the country codes), and prints them out separated by spaces.