Exercise $7-3$ Keep trip data in a binary file

In this exercise, you'll modify the programs that you created for exercises $7-1$

and $7-2$ so they create and use a binary file instead of a CSV file. Otherwise,

everything should work the same.

Modify the CSV version of the write program

Open the mpg$\_$write.py file that you created in exercise in $7-1.$ Then, save it as

mpg$\_$write$\_$binary.py in the same directory.

Modify this program so it saves the list as a binary file instead of a CSV file.

The file should be named trips.bin.

Test the program to make sure it works. To do that, add statements that read

the file at the end of the program and display the list that has been read.

Modify the CSV version of the trip program

Open the

mpg$.$py file that you created in exercise $7-2.$ Then, save it as

mpg$\_$binary.py$.$

Modify this program so it works the same as it did with the CSV file.

Test this program to make sure it works.

Here is the non$-$modified version of $"$mpg$\_$binary.py$"$:

#$!/$usr$/$bin$/$env python$3$

def get$\_$miles$\_$driven$()$:

while True:

try:

miles$\_$driven $=$ float$($input$("$Enter miles driven:$\backslash$t $"))$

if miles$\_$driven $>0$:

return miles$\_$driven

else:

print$("$Entry must be greater than zero. Please try again.

$")$

except ValueError:

print$("$Invalid input. Please enter a valid number.

$")$

def get$\_$gallons$\_$used$()$:

while True:

try:

gallons$\_$used $=$ float$($input$("$Enter gallons of gas:$\backslash$t $"))$

if gallons$\_$used $>0$:

return gallons$\_$used

else:

print$("$Entry must be greater than zero. Please try again.

$")$

except ValueError:

print$("$Invalid input. Please enter a valid number.

$")$

def write$\_$trips$($trips$)$:

with open$(\text{'}$trips$.$csv$\text{'},\text{'}$w$\text{'})$ as file:

for trip in trips:

file.write$(\text{'},\text{'}.$join$($map$($str$,$ trip$))+\text{'}$

$\text{'})$

def read$\_$trips$()$:

trips $=[]$

try:

with open$(\text{'}$trips$.$csv$\text{'},\text{'}$r$\text{'})$ as file:

for line in file:

trip$\_$data $=$ line.strip$().$split$(\text{'},\text{'})$

trips.append$([$float$($data$)$ for data in trip$\_$data$])$

except FileNotFoundError:

pass # If file doesn't exist yet, return empty list

return trips

def list$\_$trips$($trips$)$:

print$("$Distance$\backslash$tGallons$\backslash$t$\backslash$tMPG$")$

for trip in trips:

print$($f$"\{$trip$[0]\}\backslash$t$\backslash$t$\{$trip$[1]\}\backslash$t$\backslash$t$\{$trip$[2]\}")$

def main$()$:

print$("$The Miles Per Gallon program

$")$

trips $=$ read$\_$trips$()$

list$\_$trips$($trips$)$

more $="$y$"$

while more.lower$()=="$y$"$:

miles$\_$driven $=$ get$\_$miles$\_$driven$()$

gallons$\_$used $=$ get$\_$gallons$\_$used$()$

mpg $=$ round$(($miles$\_$driven $/$ gallons$\_$used$),2)$

print$("$Miles Per Gallon:$\backslash$t $"+$ str$($mpg$))$

print$()$

trips.append$([$miles$\_$driven, gallons$\_$used, mpg$])$

write$\_$trips$($trips$)$

more $=$ input$("$More entries? $($y or n$)$: $")$

print$("$Bye$")$

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

main$()$

Here is the non$-$modified version of $"$mpg$\_$write$\_$binary.py$"$:

#$!/$usr$/$bin$/$env python$3$

import csv

def get$\_$miles$\_$driven$()$:

while True:

miles$\_$driven $=$ float$($input$("$Enter miles driven: $"))$

if miles$\_$driven $>0$:

return miles$\_$driven

else:

print$("$Entry must be greater than zero. Please try again.

$")$

def get$\_$gallons$\_$used$()$:

while True:

gallons$\_$used $=$ float$($input$("$Enter gallons of gas used: $"))$

if gallons$\_$used $>0$:

return gallons$\_$used

else:

print$("$Entry must be greater than zero. Please try again.

$")$

def save$\_$to$\_$csv$($trips$)$:

with open$(\text{'}$trips$.$csv$\text{'},\text{'}$w$\text{'},$ newline$=\text{'}\text{'})$ as file:

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

writer.writerow$([\text{'}$Distance$\text{'},$ 'Gallons', $\text{'}$MPG$\text{'}])$

for trip in trips:

writer.writerow$($trip$)$

def main$()$:

print$("$The Miles Per Gallon application

$")$

trips $=[]$

while True:

miles$\_$driven $=$ get$\_$miles$\_$driven$()$

gallons$\_$used $=$ get$\_$gallons$\_$used$()$

mpg $=$ round$($miles$\_$driven $/$ gallons$\_$used, $2)$

# Display the calculated MPG

print$("$Miles Per Gallon: $\{$:$\mathrm{.}2$f$\}".$format$($mpg$))$

# Append trip data to the list

trips.append$([$miles$\_$driven, gallons$\_$used, mpg$])$

more $=$ input$("$

More entries? $($y or n$)$: $")$

if more.lower$()!="$y$"$:

break

# Save the trip data to a CSV file

save$\_$to$\_$csv$($trips$)$

print$("$Trip data saved to trips.csv

$")$

print$("$Bye$")$

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

main$()$

I am asking for the modified versions of $"$mpg$\_$binary.py$"$ and $"$mpg$\_$write$\_$binary.py$"$ shown here. That includes fully written codes from the modified versions of $"$mpg$\_$binary.py$"$ and $"$mpg$\_$write$\_$binary.py$".$