First, You need to add your accounts to acc.json file in main directory. It's currently not automated :/
Example file is provided, you just need to copy it and modify accounts username and passwords.
Then If you want changer to show your stats and account info - run ./stats_loader.py.
It will ask you for your Guard codes if needed.
Always when you want to update accounts data - run ./stats_loader.py again.
To show your account data run ./changer.py without parameters.
Example:
$ ./changer.py
SteamID3: [U:1:<steamid1>]
| Login: <username1> | Name: <nickname1>
| CS:GO:
| Profile: Linked to <username2> | Launch options: "-high -novid"
| Rank: Not Ranked | Wins: 12
| Level: 7 | Last MM: 2019-12-14 23:24
| VAC bans: 0
SteamID3: [U:1:<steamid2>]
| Login: <username2> | Name: <nickname2>
| CS:GO:
| Profile: Independent | Launch options: "-high -novid"
| Rank: Not Ranked | Wins: 10
| Level: 8 | Last MM: 2019-12-13 20:27
| VAC bans: 0
SteamID3: [U:1:<steamid3>]
| Login: <username3> | Name: <nickname3>
| CS:GO:
| Profile: Linked to <username2> | Launch options: "-high -novid"
| Rank: Not Ranked | Wins: 14
| Level: 6 | Last MM: 2019-12-14 04:32
| VAC bans: 0
Then you can login to one of your accounts using login. Example:
$ ./changer.py -l <username3>
You don't need to exit steam, It will be exited automatically.