My output is wrong, what do I change?

import csv

def readFromFile$($gradebook$)$:

gradebook $=\{\}$

with open$("$gradebook$.$csv$","$r$")$ as file:

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

header $=$ next$($reader$)$ # Skip the header row

for row in reader:

student$\_$name $=$ row$[0]$

grades $=[$int$($grade$)$ for grade in row$[1$:$]]$

gradebook$[$student$\_$name$]=$ grades

return gradebook

def computeStudentAvg$($gradebook$)$:

for student, grades in gradebook.items$()$:

avg $=$ sum$($grades$)/$ len$($grades$)$ if grades else $0$

gradebook$[$student$].$append$($avg$)$

return gradebook

def computeClassAvg$($gradebook$)$:

num$\_$students $=$ len$($gradebook$)$

if num$\_$students $==0$:

return gradebook

num$\_$assignments $=$ len$($next$($iter$($gradebook$.$values$())))$

class$\_$avg $=[0]*$ num$\_$assignments

for grades in gradebook.values$()$:

for i in range$($num$\_$assignments$)$:

class$\_$avg$[$i$]+=$ grades$[$i$]$

class$\_$avg $=[$avg $/$ num$\_$students for avg in class$\_$avg$]$

gradebook$[\text{'}$Class Average'$]=$ class$\_$avg

return gradebook

def computeLetterGrade$($gradebook$)$:

for student, grades in gradebook.items$()$:

if student $==$ 'Class Average':

continue

avg $=$ grades$[-1]$ # Last element is the student's average

if avg $>=90$:

letter$\_$grade $=\text{'}$A$\text{'}$

elif avg $>=80$:

letter$\_$grade $=\text{'}$B$\text{'}$

elif avg $>=70$:

letter$\_$grade $=\text{'}$C$\text{'}$

elif avg $>=60$:

letter$\_$grade $=\text{'}$D$\text{'}$

else:

letter$\_$grade $=\text{'}$F$\text{'}$

gradebook$[$student$].$append$($letter$\_$grade$)$

return gradebook

def writeToFile$($gradebook$,$ output$\_$filename$)$:

num$\_$assignments $=$ len$($gradebook$[\text{'}$Class Average'$])$

assignments $=[$f$\text{'}$Assignment $\{$i$+1\}\text{'}$ for i in range$($num$\_$assignments$)]$

with open$($output$\_$filename, $\text{'}$w$\text{'},$ newline$=\text{'}\text{'})$ as file:

writer $=$ csv$.$writer$($file$)$

writer.writerow$([\text{'}$Student$\text{'}]+$ assignments $+[\text{'}$Average$\text{'},$ 'Letter Grade'$])$

for student, grades in gradebook.items$()$:

if student $!=$ 'Class Average':

writer.writerow$([$student$]+$ grades$)$

def determineColumnWidths$($gradebook$)$:

num$\_$assignments $=$ len$($gradebook$.$get$(\text{'}$Class Average', $[]))$

max$\_$lengths $=[$len$("$Name$")]$ # Initial width for the 'Name' column

for i in range$($num$\_$assignments$)$:

max$\_$lengths.append$($len$($f$\text{'}$Assignment $\{$i$+1\}\text{'}))$

max$\_$lengths.extend$([$len$(\text{'}$Average$\text{'}),$ len$(\text{'}$Letter Grade'$)])$

for student, grades in gradebook.items$()$:

if student $==$ 'Class Average':

continue

max$\_$lengths$[0]=$ max$($max$\_$lengths$[0],$ len$($student$))$

for i$,$ grade in enumerate$($grades$[$:num$\_$assignments$])$:

max$\_$lengths$[$i $+1]=$ max$($max$\_$lengths$[$i $+1],$ len$($str$($grade$)))$

if 'Class Average' in gradebook:

max$\_$lengths$[-2]=$ max$($max$\_$lengths$[-2],$ len$($f$"\{$gradebook$[\text{'}$Class Average'$][0]$:$\mathrm{.}2$f$\}"))$

for student, grades in gradebook.items$()$:

if student $==$ 'Class Average':

continue

avg $=$ grades$[-2]$ # Average

letter$\_$grade $=$ grades$[-1]$ # Letter Grade

max$\_$lengths$[-2]=$ max$($max$\_$lengths$[-2],$ len$($f$"\{$avg:$\mathrm{.}2$f$\}"))$

max$\_$lengths$[-1]=$ max$($max$\_$lengths$[-1],$ len$($letter$\_$grade$))$

return max$\_$lengths

def displayGradebook$($gradebook$)$:

num$\_$assignments $=$ len$($gradebook$[\text{'}$Class Average'$])$

assignments $=[$f$\text{'}$Grade $\{$i$+1\}\text{'}$ for i in range$($num$\_$assignments$)]$

header $=["$Name$"]+$ assignments $+["$Average$",$ "Letter Grade"$]$

col$\_$widths $=$ determineColumnWidths$($gradebook$)$

print$("$

GRADE BOOK

$")$

header$\_$row $=\text{'}\text{'}.$join$($f$\text{'}\{$header$[$i$]$:$<mi>\{</mi>$col$\_$widths$[$i$]\}\}\text{'}$ for i in range$($len$($header$)))$

print$($header$\_$row$)$

for student, grades in gradebook.items$()$:

if student $==$ 'Class Average':

continue

row $=$ f$"\{$student:$<mi>\{</mi>$col$\_$widths$[0]\}\}"+\text{'}\text{'}.$join$($f$\text{'}\{$grades$[$i$]$:$<mi>\{</mi>$col$\_$widths$[$i $+1]\}\}\text{'}$ for i in range$($len$($grades$)-2))$

row $+=$ f$\text{'}\{$grades$[-2]$:$<mi>\{</mi>$col$\_$widths$[-2]\}\mathrm{.}2$f$\}\{$grades$[-1]$:$<mi>\{</mi>$col$\_$widths$[-1]\}\}\text{'}$

print$($row$)$

print$("$

Class Average:"$)$

avg$\_$row $=$ f$"\{\text{'}$Class Average':$<mi>\{</mi>$col$\_$widths$[0]\}\}"+\text{'}\text{'}.$join$($f$\text{'}\{$avg:$<mi>\{</mi>$col$\_$widths$[$i $+1]\}\mathrm{.}2$f$\}\text{'}$ for i$,$ avg in enumerate$($gradebook$[\text{'}$Class Average'$]))$

print$($avg$\_$row$)$

def main$()$:

input$\_$filename $=$ 'input$\_$gradebook.csv$\text{'}$

output$\_$filename $=$ 'output$\_$gradebook.csv$\text{'}$

gradebook $=$ readFromFile$($input$\_$filename$)$

gradebook $=$ computeStudentAvg$($gradebook$)$

gradebook $=$ computeClassAvg$($gradebook$)$

gradebook $=$ computeLetterGrade$($gradebook$)$

displapyGradebook$($gradebook$)$

writeToFile$($gradebook$,$ output$\_$filename$)$

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

main$()$GRADE BOOK