Question $1$: Addition

Open

addition.py and look at the definition of add:

def add$(a,b)$ :

"Return the sum of a and $b$

$"***$ YOUR CODE HERE $***"$

return $0$

The tests called this with a and $b$ set to different values, but the code always returned zero. Modify this definition using the following code:

def add$(a,b)$ :

"Return the sum of a and $b$

print$("$Passed $a=\%s$ and $b=\%s,$ returning $a+b=\%s\%(a,b,a+b))$

return $a+b$

Now re$-$run the autograder for only the question q$1.$

python

autograder.py $-qq1$

Question q$1$

Passed $a=1$ and $b=1,$ returning $a+b=2$

PASS: test$\_$cases$/$q$1/$addition$1.$test

add $(a,b)$ returns the sum of a and $b$

Passed $a=2$ and $b=3,$ returning $a+b=5$

$***$ PASS: test$\_$cases$/$q$1/$addition$2.$test

$***,$add$(a,b)$ returns the sum of a and $b$

Passed $a=10$ and $b=-2\mathrm{.}1,$ returning $a+b=7\mathrm{.}9$

PASS: test$\_$cases$/$q$1/$addition$3.$test

$***,$add$(a,b)$ returns the sum of a and $b$

### Question q$3$: $1/1$ ###

Finished at $22$:$54$:$31$

Provisional grades

Question q$3$: $1/1$

Total: $\frac{1}{1}$

You now pass all tests, getting full marks for question $1.$ Notice the new lines "Passed a$=..."$ which appear before $"***$ PASS: $...".$ These are produced by the print statement in add. You can use print statements like that to output information useful for debugging.

Question $2$: buyLotsOfFruit function

Add a buyLotsOfFruit$($orderList$)$ function to

buyLotsOfFruit.py which takes a list of $($fruit$,$pound$)$ tuples and returns the cost of your list. If there is some fruit in the list which doesn't appear in fruitPrices it should print an error message and return None. Please do not change the fruitPrices variable.