Ch. 5

Question 1

accessing a single character out of a string is called

Answer 1

indexing

Question 2

which of the following is same as [0:-1]

Answer 2

s[:len(s)-1 ]

Question 3

what function gives the unicode value of a character?

Answer 3

ord

Question 4

which of the following can not be used to convert a string of digits into a number

Answer 4

eval

Question 5

a successor to ASCII that includes characters from (nearly) all written languages is

Answer 5

unicode

Question 6

Which string method converts all the characters of a string to upper case?

Answer 6

upper

Question 7

The string “slots” that are filled in by the format method are marked by:

Answer 7

{}

Question 8

which of the following is not a file-reading method in python

Answer 8

readall

Question 9

the term for a program that does its input and output with files is

Answer 9

batch

Question 10

Before reading or writing to a file, a file object must be created via:

Answer 10

open

Question 11

s1 = “spam”
s2 = “ni!”

“The Knights who say, “ + s2

Answer 11

the knights who say ni!

Question 12

s1 = “spam”
s2 = “ni!”

3 * s1 + 2 * s2

Answer 12

spamspamspamni!ni!

Question 13

s1 = “spam”
s2 = “ni!”

s1[1]

Answer 13

p

Question 14

s1 = “spam”
s2 = “ni!”

s1[1:3]

Answer 14

pa

Question 15

s1 = “spam”
s2 = “ni!”

s1[2] + s2[:2]

Answer 15

ani

Question 16

s1 = “spam”
s2 = “ni!”

s1 + s2[-1]

Answer 16

spam!

Question 17

s1 = “spam”
s2 = “ni!”

s1.upper()

Answer 17

SPAM

Question 18

s1 = “spam”
s2 = “ni!”

s2.upper().ljust(4) * 3

Answer 18

NI! NI! NI!

Question 19

s1 = “spam”
s2 = “ni!”

spam

Answer 19

s1

Question 20

s1 = “spam”
s2 = “ni!”

NI!

Answer 20

s2[0:2].upper()

Question 21

s1 = “spam”
s2 = “ni!”

ni!spamni!

Answer 21

s2 + s1 + s2

Question 22

s1 = “spam”
s2 = “ni!”

spm

Answer 22

s1[0:2] + s1[-1]

Question 23

“Looks like (1) and (0) for breakfast”.format(“eggs”, “spam”)

Answer 23

not legal bc curly braces are required around 1 and 0

Question 24

“There is {0} {1} {2} {3}”.format(1, “spam”, 4 “you”)

Answer 24

‘There is 1 spam 4 you.’

Question 25

“Hello {0}”.format(“Susan”, “Computewell”)

Answer 25

‘Hello Susan’

Question 26

“{0:0.2f} {0:0.2f}”.format(2.3, 2.3468)

Answer 26

‘2.30 2.30’

Question 27

“{7.5f} {7.5f}”.format(2.3, 2.3468)

Answer 27

not legal bc no index followed

Question 28

“Time left {0:02}:{1:05.2f}”.format(1, 37.374)

Answer 28

‘Time left 1:37.37’

Question 29

“{1:3}”.format(“14”)

Answer 29

‘14’

Question 30

Explain why public key encryption is more useful for securing communications on the Internet then private (shared) key encryption.

Answer 30

private keys use the same key for locking and unlocking, while public keys use one to lock and a different key to unlock

Question 31

a certain CS professor gives 5 point quizzes that are graded on the scale 5-A, 4-B, 3-C, 2-D, 1-F, 0-F. Write a program that accepts a quiz score as an input and prints out the corresponding grade

Answer 31

lettergradescale = “FFDCBA”
quizgrade = int(input(“Please enter the quiz grade on a scale from 0 to 5: “))
lettergrade = lettergradescale[quizgrade]
print(“Your quiz grade of {0} corrsesponds to the letter grade of {1}.”.format(quizgrade, lettergrade))

Question 32

write a program that allows the user to type in a phrase and then outputs the acronym for that phrase. Note: the acronym should be all uppercase, even if the words in the phrase are not capitalized

Answer 32

def get_acronym(phrase):
words = phrase.split()
acronym = ‘‘.join(word[0].upper() for word in words)
return acronym

input_phrase = input(“Enter a phrase to generate an acronym: “)

acronym = get_acronym(input_phrase)

print(“The acronym for ‘{0}’ is ‘{1}’.”.format(input_phrase, acronym))

Question 33

write a program that calculates the numeric value of a single name provided as input

Answer 33

def calculate_numeric_value(name):
name = name.upper()
numeric_value = 0

for letter in name:
    if letter.isalpha():
        numeric_value += ord(letter) - ord('A') + 1

return numeric_value

input_name = input(“Enter a name to calculate its numeric value: “)

result = calculate_numeric_value(input_name)

print(“The numeric value of ‘{0}’ is {1}.”.format(input_name, result))