Question

Need help with python 3 assignment

Answer 1

@nsellers23
What is the assignment?

Answer 2

I cannot promise that I can help, but I would give it a try

Answer 3

tell us what you need

Answer 4

This is my assignment

Answer 5

and this is my data file i need to get information from

Answer 6

I was sick for about a week with some virus so i missed all the lectures about getting information from a data file, so i tried to use the book to figure this out but i just cant seem to figure it out.

Answer 7

I'll have a look

Answer 8

thanks

Answer 9

A quick file read:

foo = open( "apr5.txt", 'r' )
for line in foo:
#do stuff with line, separting the fields with tabs may be a good choice

foo.close()

Answer 10

why does this tell me that i need 'c' to be defined?
```
inFile = open('pa5.tickets','r')
print()
print('Customer Name' + 'Number' + 'Type' + 'Seat' + 'Price')
print('------------------------------------------------------')

for i in range(7):
type = inFile.readline()
type = type.strip()
num = eval(inFile.readline())
if type == 'c':
word = 'Child'
bill = num * 17.50
if type == 'r':
word = 'Reserved'
bill = num * 27.50
elif type == 'g':
word = 'General'
bill = bill
elif type == 'a':
word = 'Adult'
bill = num * 27.50
if type == 'r':
word = 'Reserved'
bill = num * 37.50
if type == 'g':
word = 'General'
bill = bill
print(format(word,'20s'),format(num,'7.2f'),format(bill,'8.2f'))
inFile.close()
```

Answer 11

@e.mccormick can you come read this last question on this post and see if you see an answeR?

Answer 12

you don't always know how long the file will be
This one works in Python 2.7 and you need to brush up the print formatting
```
cPrice = 17.50
aPrice = 27.50
rAdd = 10
aMax = 0
aMaxCust = ''
cMax = 0
cMaxCust = ''
totalTickets = 0
Adult = 'Adult'
Child = 'Child'
reservedSeats = 'Reserved'
generalSeats = 'General'
ticketsales = open("tickets.txt", "r")

sentinalValue = 'XXXX'

print('Customer Name Number Type Seat Price')
print('-------------------------------------------------------------')
line = ticketsales.readline()
while line[:4] != sentinalValue:
customer = line
line = ticketsales.readline()
if line[0] =='a':
ticketType = Adult
else:
ticketType = Child

Reserved = ticketsales.readline()[0]=='r'
if Reserved:
Seats = reservedSeats
else:
Seats = generalSeats

Number = int(ticketsales.readline())
totalTickets += Number

if ticketType == Adult:
Price = aPrice*Number
if Seats>aMax:
aMax=Number
aCust=customer
else:
Price = cPrice*Number
if Seats>cMax:
cMax = Number
cCust = customer
if Reserved:
Price += Number*rAdd

print(customer,str(Number),ticketType,Seats,str(Price))

line = ticketsales.readline()

ticketsales.close()
print('-------------------------------------------------------------')
print
print('Statistics')
print('----------')
print('Total Tickets Sold: '), totalTickets
print('Maximum Adult Tickets Sold: '), aMax,
print(', by: '), aCust,
print('Maximum Child Tickets Sold: '), cMax,
print(', by: '), cCust
```

Answer 13

alright let me see if i can get it to work on python3

Answer 14

^i dont mean im just copying, i just mean ill use it to try and figure it out

Answer 15

here is the ticket.txt
(it is written in linux, an the program adds a \n after each input
That's why I needed the indices

Answer 16

@nsellers23
what do you mean by
why does this tell me that i need 'c' to be defined?

Yeh, you can adapt you're code if needed

Answer 17

my output error says so, hold on

Answer 18

```
Traceback (most recent call last):
File "C:\Users\nicholas\Desktop\CMPS 150\Programming Assignments\Programming Assignment 5.py", line 21, in <module>
num = eval(inFile.readline())
File "<string>", line 1, in <module>
NameError: name 'c' is not defined
```

Answer 19

Aren't you assigning the customer name to type?

Answer 20

instead of the type?

Answer 21

no its supposed to pull all the info i need out of the file

Answer 22

including the customer name

Answer 23

Yeh, but where is that happening?

Answer 24

tbh im not really sure, i missed the lectures for this stuff so im just trying to figure it out on my own

Answer 25

every time you have an inFile.readline() it reads the next line of the file

so you have

for i in range(7):
type = inFile.readline()

there the customer name is assigned to type

you can check it by putting a print statement just after this line

Answer 26

so will the for i in range(7): read all the lines of the file? i have an example im trying to use to help me and the data file has 30 lines of data(2 different kinds) and it has for i in range(15)

Answer 27

If you look at the tickets file, you will see that there are 4 lines to each movie. So you will read in four lines each time you set up an entry.

Answer 28

oooh so i should make it
```
for i in range(4)
```
??

Answer 29

no
it checks if i < 7
if so it executes everything under the for
then it adds 1 to i
and goes back to the for and checks if i is still < 7
etc

Answer 30

I think a while loop works better
and have it stop if it encounters the sentinal value:
that is the 'XXXXX'

Answer 31

hm thats not a bad idea

Answer 32

within the while loop you can read the customer data for each customer
that is a inFile.readline() fro customer, seatType, ReservedType, and Number
so 4 times

it repeats for every customer that way and stops when XXXXX is encountered

Answer 33

Well, I would sentinel on the x instead of c/a or the -99 rather than the XXXXX. That is because you could end up with a movie that is named XXXXX. But oh well, that is a choice they made in the instructions. Since XXX was a movie, I think their choice is poor, but you need to follow that instruction.

Also, as the instruction says sentinel, which does indicate a while of some sort is needed.

Answer 34

I would too, but in the assignment that was explicitly mentioned
'The sentinel value will be a customer name of ‘XXXXX’ (all capital letters)'

Answer 35

But maybe I'm interpreting that too stricktly

Answer 36

As for the book, here is another option:

http://www.tutorialspoint.com/python/python_files_io.htm
That is I/O in general. And then...

http://www.tutorialspoint.com/python/file_readline.htm
readline() to pull in each line as a string.

Answer 37

@abtster No, when they make a specific instruction like thatm even a poor one, you have to follow it. I was just adding that part to point out a flaw in the instructions to keep in mind for the future.

Answer 38

ill be back in a few minutes, this gonna take a while and already sleepy, gonna have to go get an energy drink.

thank yuo for the help so far btw everyone

Answer 39

The assignment also states
As you read through the file, print a “neat and tidy” table of the data read for the customer
....

so it they probably want the input line by line, and not to read everything in first and then cycle through the full input

Answer 40

Why do i get this error?
```
Traceback (most recent call last):
File "C:\Users\nicholas\Desktop\CMPS 150\Programming Assignments\pa5 final attem[t.py", line 7, in <module>
ticType = ticType.strip()
NameError: name 'ticType' is not defined
```

from this code
```
inFile = open("pa5.tickets","r")



for i in range(7):
name = inFile.readline()
ticType = ticType.strip()
seat = seat.strip()
number = eval(inFile.readfileline())

if ticType == 'c':
perPrice = 17.50
ticType = 'Child'
seat = 'General'

if ticType == 'c':
perPrice = 27.50
ticType = 'Child'
seat = 'Reserved'

if ticType == 'a':
perPrice = 27.50
ticType = 'Adult'
seat = 'General'

if ticType == 'a':
perPrice = 37.50
ticType = 'Adult'
seat = 'Reserved'
```

Answer 41

The if statements and blocks should be idented one level further
they should be in the block of code under the for statement