Hi Ankur
You are getting the error because you have initialized 'std' as an empty
list: std = []
and then indexing it: std[i]. If you are not sure of the size of the list
at the time of declaration, you will have to use the list method "append()"
to add elements to the list: std.append(STUDENT(roll,name,present,absent))
> On Sun, 19 Aug 2018, ankur gupta wrote:
>
> > Dear Sayantan, Mohit
> > Tried executing by implementing following change
> >
> > class STUDENT:
> > no_of_students=0
> > def __init__(self,roll,name,present,absent):
> > self.roll=roll
> > self.name=name
> > self.present=present
> > self.absent=absent
> > STUDENT.no_of_students+=1
> >
> > std= []
> > n='Y'
> > i=0
> > while n=='Y' or n=='y':
> > roll=input("ENTER NAME: ")
> > name=input("ENTER ROLL NO:")
> > present=input("ENTER NO. OF DAYS PRESENT:")
> > absent=input("ENTER NO. OF DAYS ABSENT:")
> > std[i] = STUDENT(roll,name,present,absent)
> > n=input("ENTER MORE RECORDS (Y/y)?...")
> > i+1
> >
> >
> > Received following error code?
> >
> > ankur@ankur-Lenovo-G50-80:~/PycharmProjects$ cd
> /home/ankur/PycharmProjects ; env "PYTHONIOENCODING=UTF-8"
> > "PYTHONUNBUFFERED=1" /home/ankur/anaconda3/bin/python
> >
> /home/ankur/.vscode/extensions/ms-python.python-2018.4.0/pythonFiles/PythonTools/visualstudio_py_launcher.py
> > /home/ankur/PycharmProjects 39355 34806ad9-833a-4524-8cd6-18ca4aa74f14
> RedirectOutput,RedirectOutput
> > "/home/ankur/PycharmProjects/STUDENTS ATTENDANCE.PY"
> > ENTER NAME: ANKUR
> > ENTER ROLL NO:1ENTER NO. OF DAYS PRESENT:12ENTER NO. OF DAYS
> ABSENT:8Traceback (most recent call last):
> > ? File "/home/ankur/PycharmProjects/STUDENTS ATTENDANCE.PY", line 18, in
> <module>
> > ??? std[i] = STUDENT(roll,name,present,absent)
> > IndexError: list assignment index out of range
> >
> > Pastebin page has been removed therefor attaching file along the mail
> >
> >
> > Thanks
> > Ankur Gupta
> >
> > On Sun, Aug 19, 2018 at 3:59 PM Sayantan <skb655...@gmail.com> wrote:
> > Hello Ankur,
> >
> > A few things before we take the program in context:
> >
> > 1. Always paste the code in a page(pastebin/paste.ubuntu.com &
> the like)
> > so that the indentation remains proper. This will help the members
> to
> > easily figure out the issue with the code.
> >
> > 2. Always refer to the error message provided by the interpreter
> before
> > you approach an audience. You, may have in this case, already done
> that.
> > This is just a suggestion.
> >
> > Now, back to the code, the error is because there is no
> > definition/information about 'std' in the code. The interpreter
> doesn't
> > know in this case the type of 'std' itself. As a result, when you
> are
> > trying to push a value into the std[i] variable/memory(a
> collection is
> > what you have in mind), the interpreter is spewing this error
> message.
> >
> > Defining std = [] or the specific collection type(dict/tuple) would
> > resolve this error.
> >
> > --
> > Sayantan Bhattacharya
> > [Sent from pine@dev-machine]
> >
> > On Sun, 19 Aug 2018, ankur gupta wrote:
> >
> > > ---------- Forwarded message ---------
> > > From: ankur gupta <ankurim...@gmail.com>
> > > Date: Sun, Aug 19, 2018 at 3:07 PM
> > > Subject: Please help with this code
> > > To: <bangpypers@python.org>
> > >
> > >
> > > Dear Sir
> > > I am new to? python programing, I am getting error while
> executing this
> > > code. I want to generate multiple instance using while loop to
> store data
> > > following is the code
> > >
> > > class STUDENT:
> > > no_of_students=0
> > > def __init__(self,roll,name,present,absent):
> > > self.roll=roll
> > > self.name=name
> > > self.present=present
> > > self.absent=absent
> > > STUDENT.no_of_students+=1
> > >
> > > n='Y'
> > > i=0
> > > while n=='Y' or n=='y':
> > > roll=input("ENTER NAME: ")
> > > name=input("ENTER ROLL NO:")
> > > present=input("ENTER NO. OF DAYS PRESENT:")
> > > absent=input("ENTER NO. OF DAYS ABSENT:")
> > > std[i] = STUDENT(roll,name,present,absent)
> > > n=input("ENTER MORE RECORDS (Y/y)?...")
> > > i+1
> > >
> > >
> > > GETTING THIS ERROR
> > >
> > > ankur@ankur-Lenovo-G50-80:~/PycharmProjects$ cd
> /home/ankur/PycharmProjects
> > > ; env "PYTHONIOENCODING=UTF-8" "PYTHO
> > > NUNBUFFERED=1" /home/ankur/anaconda3/bin/python
> > > /home/ankur/.vscode/extensions/ms-python.python-2018.4.0/pythonFi
> > > les/PythonTools/visualstudio_py_launcher.py
> /home/ankur/PycharmProjects
> > > 42323 34806ad9-833a-4524-8cd6-18ca4aa74f1
> > > 4 RedirectOutput,RedirectOutput
> "/home/ankur/PycharmProjects/STUDENTS
> > > ATTENDANCE.PY"
> > > ENTER NAME: ANKUR
> > > ENTER ROLL NO:1
> > > ENTER NO. OF DAYS PRESENT:12
> > > ENTER NO. OF DAYS ABSENT:8
> > > Traceback (most recent call last):
> > >? File "/home/ankur/PycharmProjects/STUDENTS ATTENDANCE.PY", line
> 17, in
> > > <module>
> > >? ? std[i] = STUDENT(roll,name,present,absent)
> > > NameError: name 'std' is not defined
> > >
> > >
> > > THANKS? IN ADVANCE
> > > ANKUR GUPTA
>
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