Cps280S Final Exam

Front 1

T/F

Suppose d = {'john':40, 'peter':45}; the expression 40 in d is __________.

Back 1

False

Front 2

Assume two sets exist as shown below:
set1 = set([2, 3, 4, 5, 9])
set2 = set([2, 3, 5, 8, 12, 24])

What is contained in set3 given the following statement?
set3 = set1.difference(set2) | set2.difference(set1)

Back 2

set3 = (4, 8, 9, 12, 24)

Front 3

T/F
The following is a valid statement assuming alist has already been declared as a list:
if 5 in alist:
print '5 is in the list'

Back 3

True

Front 4

Suppose d = {'john':40, 'peter':45}, what happens when retieving a value using d['susan']?

Back 4

Since 'susan' is not a key in the set, Python raises a KeyError exception.

Front 5

A function _________.

Back 5

..may have no parameters

Front 6

Suppose t = (1, 2, 4, 3), t[1 : -1] is _________.

Back 6

(2,4)

Front 7

When writing a function in python, how is a void function written (i.e. a function that does not return anything?

Back 7

By not using a return statement in the function definition

Front 8

Analyze the following statement:

sum = 0
for d in range(0, 10, 0.1):
sum += sum + d

Back 8

The program has a syntax error because the arguments in the range must be integers.

Front 9

Suppose d = {'john':40, 'peter':45}, the keys are __________.

Back 9

'john' and 'peter'

Front 10

How many times will the following code print 'Welcome to Python'?
count = 0
while count < 10:
print('Welcome to Python')
count += 1

Back 10

10

Front 11

What data structure is obj in the following statement?
obj = (4, 7, 8, 3)

Back 11

Tuple

Front 12

Which of the following code snippets is correct syntactically? Assume a list exists:
alist = [2, 3, 5, 78, 65]

Back 12

for elem in alist:
print elem

Front 13

T/F
Sets maintain order; assuming a set of numbers was created during initialization, printing the set will always result in the numbers printing in the same order as initialized.

Back 13

False

Front 14

What is the number of iterations in the following loop:

for i in range(1, n):
# iteration

Back 14

n-1

Front 15

T/F
The function call in the following function causes syntax errors.

import math
def main():
math.sin(math.pi)

main()
Answer

Back 15

False

Front 16

Tuples have what bracketing?
1, 2, 3, 4

Back 16

(1,2,3,4)

Front 17

Sets have what bracketing?
1, 2, 3, 4

Back 17

[(1, 2, 3, 4)]

Front 18

Lists have what bracketing?

Back 18

[1, 2, 3, 4]

Front 19

Dictionaries have what bracketing?

Back 19

{1, 2, 3, 4}

Front 20

Give an example of a 'floating point number'.

Back 20

6.5

Front 21

Give an example of a 'string literal'.

Back 21

'40', str(5)

Front 22

Give an example of an 'integer'.

Back 22

14

Front 23

What gets printed?

name = 'Professor McGonagall'
name = name.replace('McGonagoll', 'Cat')
print name

Back 23

Professor Cat

Front 24

What gets printed?

result = 38 / 3.0
print result

Back 24

12.66666666

Front 25

What gets printed?

result = 38 / 3
print result

Back 25

12

Front 26

Given the following command line, what would argv[0], argv[1], argv[2] and argv[3] be?

% python RunMe.py file1.txt file2.txt

Back 26

argv[0] = RunMe.py
argv[1] = file1.txt
argv[2] = file2.txt
argv[3] = ERROR, out of bounds

Front 27

When using command line arguments in python, can a multiword string be sent down as one argument?

Back 27

Yes

Front 28

What gets printed, assuming 212.0 is entered in they keyboard?

fahr = raw_input('Enter the temperatures in Fahrenheit: ')
celsius = 5.0 / 9.0 * (fahr - 32.0)
print '%.1f' % celsius

Back 28

ERROR, fahr is not a numeric data type

Front 29

What gets printed, assuming 212.0 is entered in they keyboard?

fahr =float( raw_input('Enter the temperatures in Fahrenheit: '))
celsius = 5.0 / 9.0 * (fahr - 32.0)
print '%.1f' % celsius

Back 29

100.0

Front 30

T/F
In python, variables must be declared and assigned a data type before using them.

Back 30

False

Front 31

T/F
In python, once a variable is used, its data type may not change within a block

Back 31

False

Front 32

T/F
In python, everything is an object-no primitive variables exist

Back 32

True

Front 33

What numbers are printed?

for i in range (3):
print i

for i in range (6,9):
print i

Back 33

0, 1, 2, 6, 7, 8

Front 34

Which function reads in an entire data file as a list of strings, with one line per element?

Back 34

readlines

Front 35

Given the following command line, what data type would argv[1] be?

% python RunMe.py 23 4

Back 35

A string

Front 36

T/F
Indentation is not important in python

Back 36

False

Front 37

T/F
A block of statements in python is delimited by the { and } brackets.

Back 37

False

Front 38

What gets printed?
name = 'python'
name.replace('python', 'Slytherin')
print name

Back 38

python

Front 39

When using the command line arguments in python, do you have to worrd about argv being null?

Back 39

No

Front 40

What gets printed?

print 'hello' 'world'

Back 40

helloworld

Front 41

What gets printed?

print 'hello', 'world'

Back 41

hello world

Front 42

What gets printed?

name = 'snow storm'
print '%s' % name[6:8]

Back 42

to

Front 43

What gets printed?

name = 'snow storm'
name[5] = 'x'
print name

Back 43

ERROR, this code will not run because strings are immutable and cannot be changed

Front 44

What numbers get printed?

for i in range(2):
print i

for in in range(4,6):
print i

Back 44

0, 1, 4, 5

Front 45

What gets printed?

name = 'Professor McGonagall'
name = name.replace('Professor McGonagall', 'the Cat'
print name

Back 45

the Cat

Front 46

When using command line arguments in python, must you import the sys module (or part of it) into your code?

Back 46

Yes

Front 47

What do the following function do in regards to a data file?

open

Back 47

Opens a file to be read

Front 48

What do the following function do in regards to a data file?

read

Back 48

Reads a string of the file

Front 49

What do the following function do in regards to a data file?

readline

Back 49

Reads one line of the file

Front 50

What do the following function do in regards to a data file?

readlines

Back 50

Reads all of the file as a list of strings

Front 51

What function reads an entire data file as a list of strings?

Back 51

readlines

Front 52

T/F
A statement in python must end in a semi-colon

Back 52

False

Front 53

Assume two sets exist as shown below:

set 1 = set([2, 3, 6, 12, 21])
set 2 = set([2, 6, 7, 8, 12, 27])

What is contained in set3 given the following statement?
set3 = set1.difference(set2)

Back 53

set3 = (3, 21)

Front 54

What is the number of iterations in the following loop:

for i in range (1, 13):
print i

Back 54

12

Front 55

Suppose d = {'freezing':0, 'boiling':212}
They keys are _.

Back 55

freezing and boiling

Front 56

T/F
The following is a valid statement assuming alist has already been declared as a list:

if x in alist:
print x, 'is in the list'

Back 56

True