For starters, I followed the directions above, and here's my code version of it:

def readCounties$($fileName$)$:

counties $=[]$

with open$($UScounties$2.$txt$,"$r$")$ as file:

for line in file:

county, state $=$ line.strip$().$split$(",")$

counties.append$($f$"\{$state$\}$: $\{$county$\}")$

return counties

if $\_\_$name$\_\_=="\_\_$main$\_\_"$ :

readFile $=$ UScounties$2.$txt

counties $=$ readCounties$($readFile$)$

counties.sort$()$

for county in counties:

print$($county$)$

Whenever I hit "run" it gives me this error at line $11$: builtins.NameError: name 'UScounties$2\text{'}$ is not defined"

I thought it was defined? How is it not defined? How can this be fixed?