When using a Jupyter notebook, what happens if I comment out a variable declaration and then try to call it? Instead of receiving a 'variable is not defined' error, the output produced is from before the variable was commented. Why does this occur?
import random
number = random.randint(1,9)
##user_guess = 3
def first():
print(number)
def second():
print(user_guess)
second()
Output: 3
This behavior is unexpected as it should result in a 'variable is not defined' error.
In order to avoid the "NameError" stating that "user_guess is not defined," ensure that you have executed the cell in the notebook where the variable was previously defined before commenting it out and rerunning the cell. Jupyter Notebook retains memory of variables that were defined earlier. To resolve this issue, restart the notebook kernel and run the cell again.
In the world of Jupyter runtime, all variables find their cozy spot in memory. For instance, if you were to type
x = 1
in one code cell, the beloved variable x will linger around and keep you company in every subsequent cell you dare to run. It's like leaving a breadcrumb trail for yourself. So, when you venture into the next cell and decide to
print(x)
voila! The x from the past reappears, waving hello once again.
The saga continues here – you've brought x to life as a variable, now it proudly resides in your computer's memory. Even when you rerun the cell with x discreetly hidden, Jupyter doesn't erase its memory just yet. Think of it as a never-ending story where x remains defined, not undefined.
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