$1.(11$ points: $1$ point each$)$ The following are true$/$false questions. Write either T

or F in the boxes at the bottom of page $1.$ If there$$s any counterexample, it$$s

false.

$($a$)$ If a list in Python contains multiple identical items and you try to convert it

to a set, the program will crash.

$($b$)$ If you try to access a key that does not exist in a dictionary, Python will return

None.

$($c$)$ Using curly braces $\{\}$ creates an empty set.

$($d$)$ The dictionary comprehension $\{$str$($x$)$:$0$ for x in range$(1,6)\}$ is equivalent to the dictionary $\{"1"$:$0,"2"$:$0,"3"$:$0,"4"$:$0,"5"$:$0\}.$

$($e$)$ The $"$in$"$ operator can be used to check for the presence of an element in a

tuple, but it doesn$$t work on sets because sets have no order.

$($f$)$ The symmetric difference of two sets in Python can also be expressed as the

union of the two sets, minus their intersection.

$($g$)$ The $.$pop$()$ method for dictionaries in Python removes the last added key$-$value

pair of the dictionary and returns it$.$

$($h$)$ When iterating over a dictionary using a for loop, the loop variable refers to

the keys of the dictionary.

$($i$)$ You can loop over sets, but you cannot loop over tuples.

$($j$)$ Assuming s$1$ and s$2$ are both sets, the expression s$1.$difference$($s$2)$ can

return a different result from s$2.$difference$($s$1).$

$($k$)$ Both lists and tuples in Python support adding elements after creation, but

unlike lists, elements in a tuple cannot be changed once added.