I am getting the following error and need help: $.$py$",$ line $19,$ in read$\_$csv

data.append$($int$($row$[0]))$

KeyError: $0$import csv

def selection$\_$sort$($arr$)$:

$n=$len$(arrr)$

for $i$ in range$(n-1$ :

min$\_$index $=i$

if arr$[j]$ arr$[$min$\_$index$]$:

min$\_$index $=j$

arr$[i],$ arr$[$min$\_$index$]=$arr$[mi{n}_i$ndex$],$ arr$[$i$]$

def read$\_$csv$($filename$)$:

data $=[]$

with open$($filename$,\text{'}$r$\text{'})$ as file:

reader $=$ csv$.$DictReader$($file$)$

for row in reader:

data.append $($int $($row $[0]))$

return data

def main$()$:

file $=$ "Array $1(500-$A$).$ csv$"$

unsorted $=$ read$\_$csv$($file$)$

print$("$Before sorting: $",$ unsorted$)$

selection$\_$sort $($unsorted$)$

print$("$After Sorting: $",$ unsorted$)$

if $==""$:

$381$

Arr