CMPSC 101 EXAM 2 QUESTIONS & ANSWERS(RATED A+)

CMPSC 101 EXAM 2 QUESTIONS &
ANSWERS(RATED A+)
Branching - ANSWERdirects a program to execute either one group of statements or
another

Function - ANSWERPredefined set of code that takes in Input and produces some
sort of Output

Function Cell - ANSWERfunctionName(argument1, argument2, ...)

List - ANSWERA collection of values grouped together

Why use lists? - ANSWERWhen you have lots of variables that store related
information

List examples - ANSWERmyList = []
myList = [1,2,3,4]
myList = list('Hello World')

How to access values in a list - ANSWERlist[index]

List length - ANSWERlists start at index 0 and go up to the list length - 1

Tuples - ANSWERUse () rather than []
Are immutable while lists are mutable

Tuple example - ANSWERmyTuple = (1,2)
myTuple[0] = 1

Can you change the values in a tuple? - ANSWERNo, it's immutable

List of lists - ANSWER:my2DList = [[1,2,3],[4,5,6],[7,8,9]]

Referencing list of lists - ANSWERmy2DList[0] is [1,2,3]
my2DList[1][2] #would be 6

List1 + List2 - ANSWER[1.2] + [3,4] = [1,2,3,4]

3*List - ANSWER[1,2,1,2,1,2]

len(list) - ANSWERLength of the list

list.append(x) - ANSWERadd x to the end of the list

list.remove(x) - ANSWERremove x from the list

, del list[x] - ANSWERdeletes the value at position x

list.insert(index,value) - ANSWERinserts value at position index

Dictionaries - ANSWERsimilar to lists but have a key tied to every value instead of a
position

Keys - ANSWERanything that is immutable (ints, strings, tuples, etc)

Why use dictionaries? - ANSWERThere are two pieces of information tied together

continue - ANSWERCease executing the current repetition of a loop. If there's
another iteration of the loop, moves on to the next one

unpacking - ANSWERa process that performs multiple assignments at once, binding
comma-separated names on the left to the elements of a sequence on the right

enumerate() - ANSWERretrieves both the index and corresponding element value at
the same time,

nested loop - ANSWERa loop that appears as part of the body of another loop


Dictionary examples - ANSWERmyDictionary = {}
myDictionary = {'M':1, 'i':1, 's':2}

Assignments - ANSWERmyDictionary['a'] = 1
myDictionary['M'] = 1

key in dictionary - ANSWERChecks to see if a key is in the dictionary

loop - ANSWERexecutes the same code over and over again as long as some
condition is True

while loop - ANSWERexecutes a block of code as long as the loop's expression is
True

for loop - ANSWERa statement loops over each element in a container one at a
time, assigning the next element to a variable that can then be used in the loop body

range() - ANSWERgenerates a sequence of numbers, starting at zero and ending
before a value given inside the parentheses

break - ANSWERcauses an immediate exit of the loop

infinite loop - ANSWERa loop that will always execute because the loop's expression
is always True

Boolean - ANSWERTrue or False