In python, we will often have our data in some form of list or array like:

xdata$=$np$.$ array $([1,4,9,16,25,36])$

and we will need to access an individual element of the array by using an index:

element$=$xdata $[2]$

print $($element$)$

or maybe subsets of the array using slicing:

subset$=$xdata $[1$:$-1]$

print $(subset)$

Do some research online to understand how indices and slicing work with python lists to predict the output of running the lines of code above.