I have defined a class with a mistake.
def display(Tupac): # the first argument is ALWAYS the instance being called.
print(Tupa.data) # we just call it self by mere convention. In this class I called it Tupac
Without noticing it, I ran the above, with the wrong object (Tupa.data instead of Tupac.data). So, I corrected the code above changing Tupa.data to Tupac.data, and tried to rerun the code. However, the new definition didn't load. Therefore, I tried using [this answer with autoreload](https://stackoverflow.com/questions/12085483/how-can-i-reload-a-class-definition-in-ipython) but it didn't solve the problem, because it seems I should have called autoreload before running the class definition.
Therefore, how would I go about solving this?
Edit: In my case, I'm stating the class definitions in a Jupyter notebook, the same where I'm working on, and running other calls.
How to reload a class definition depends where you define the class:
1. If you define it in the REPL (e.g. after starting Python on the command line with `python3`), you can just write the whole definition again with the change and it overwrites the old definition.
2. **If you define the class in a Jupyter notebook session, the situation is the same: Just type the whole corrected definition again in a new cell. It will overwrite the old definition. Make sure not only to retype the `display` method, but the whole class.**
2. The more common case is that you define the class in a file. So say you have defined your class in a file `first_class.py` with the follwoing cotent (containing the error):
And then you import this file as a module (e.g. in the REPL) with:
>>> import first_class
(Note that in the line above "`>>>`" just stands for the REPL prompt and should _not_ be entered.)
Now you notice that calling the `display` method causes a `NameError`. So you change the class in `first_class.py` and save the file.
**But this is not enough.** The REPL still holds the old definition in its memory. So you need to tell the REPL to *reload* the file. Do it in Python 3 like this (in the REPL):
>>> import importlib # importlib is a module from the standard library
Now a call to the `display` method should work (if you had corrected the definition in the file.)
For more info on the `imp` module in he standard library see [here](https://docs.python.org/3/library/importlib.html#module-importlib).