explain this code to me usr$\_$text $=$ input$(\text{'}$Enter a string: $\text{'})$

print$()$

first$\_$half $=$ usr$\_$text$[$:len$($usr$\_$text$)//2]$

last$\_$half $=$ usr$\_$text$[$len$($usr$\_$text$)//2$:$]$

print$(\text{'}$The first half of the string is $"\{\}"\text{'}.$format$($first$\_$half$))$

print$(\text{'}$The second half of the string is $"\{\}"\text{'}.$format$($last$\_$half$))$