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 _______________________________________________ BangPypers mailing list BangPypers@python.org https://mail.python.org/mailman/listinfo/bangpypers
_______________________________________________ BangPypers mailing list BangPypers@python.org https://mail.python.org/mailman/listinfo/bangpypers