When running scripts or programs like Python in the PowerShell terminal or console in ConEmu, you may sometimes be unable to force-quit them with Ctrl-C.
If you canโt force-quit scripts in ConEmu, you can send a termination signal to the script from the ConEmu operation panel.
In ConEmu: right-click on tab > close or kill > kill active process

(Reference)
Ctrl-C for quitting Python in Powershell now not working - Stack Overflow