data$=$np$.$array $([0,1,4,9,16,25])$ #Here is some sample data

difference$=$np$.$zeros$($len$($data$)-1)$ #'difference' is a new array filled with zeroes.

print$(\text{'}$difference before the "for" loop:$\text{'},$ difference$)$

print$(\text{'}\frac{?}{?}$

${?}^{\text{'}})$

for $i$ in range$($len$($difference$))$: #this "for" runs the indented lines below onde for each value of $i.$

difference$[$i$]=($data$[$i$+1]-$data$[$i$])$ #this line is filling in the values in our 'difference' array

print$($i$)$

print$(\text{'}$difference during the "for" loop:$\text{'},$ difference$)$

print$(\text{'}\frac{?}{?}$

${?}^{\text{'}})$

print$(\text{'}$difference AFTER the "for" loop:$\text{'},$ difference$)$

print$($i$)$