Mathematical functions, strings and objects

Question 1

What is ASCII?

Answer 1

ASCII (American Standard Code for Information Interchange) is an 8-bit encoding scheme for representing all uppercase and lowercase letters, digits, punctuation marks, and control characters. ASCII uses numbers 0 through 127 to represent characters.

Question 2

ASCII (American Standard Code for Information Interchange), an 8-bit _____ ______ for representing all _____ and ______ letters, _____, _______ ______, and ______ ______. ASCII uses numbers ____ through _____ to represent characters.

Answer 2

ASCII (American Standard Code for Information Interchange), an 8-bit encoding scheme for representing all uppercase and lowercase letters, digits, punctuation marks, and control characters. ASCII uses numbers 0 through 127 to represent characters.

Question 3

Unicode is…

Answer 3

…an encoding scheme for representing international characters

Question 4

What will be displayed by print(ord('z') - ord('a'))?
 A. 25
 B. 26
 C. a
 D. z

Answer 4

A. 25

Question 5

Suppose x is a char variable with a value 'b'. What will be displayed by the statement print(chr(ord(x) + 1))?
 A. a
 B. b
 C. c
 D. d

Answer 5

C. c

Question 6

An escape sequence is a special notation that consists of a ________ followed by a _______ or a combination of ______.

Answer 6

An escape sequence is a special notation that consists of a backslash () followed by a character or a combination of digits.

Question 7

The backslash \ is called an ______ _______

Answer 7

escape character

Question 8

How do you display the characters \ and “?

Answer 8

print(“\”)

print(“"”)

Question 9

Which of the following statement prints smith\exam1\test.txt?
 A. print("smith\exam1\test.txt")
 B. print("smith\\exam1\\test.txt")
 C. print("smith\"exam1\"test.txt")
 D. print("smith"\exam1"\test.txt")

Answer 9

B. print(“smith\exam1\test.txt”)

Question 10

What will be displayed by the following code?

print(“A”, end = ‘ ‘)
print(“B”, end = ‘ ‘)
print(“C”, end = ‘ ‘)
print(“D”, end = ‘ ‘)

A. ABCD
B. A, B, C, D
C. A B C D
D. A, B, C, D will be displayed on four lines

Answer 10

C. A B C D

Question 11

Suppose i is an int type variable. Which of the following statements display the character whose Unicode is stored in variable i?
 A. print(i)
 B. print(str(i))
 C. print(int(i))
 D. print(chr(i))

Answer 11

D. print(chr(i))

Question 12

The expression "Good " + 1 + 2 + 3 evaluates to \_\_\_\_\_\_\_\_.
 A. Good123
 B. Good6
 C. Good 123
 D. Illegal expression

Answer 12

D. Illegal expression

Hint: In Python, the + operator cannot be used to concatenate a string with a number. The number needs to be converted to a string using the str(number) function.

Question 13

Suppose you entered A and Z when running the following code. What is the output?
x = input(“Enter a character: “)
y = input(“Enter a character: “)
print(ord(y) - ord(x))

Answer 13

25

Question 14

What is max("Programming is fun")?
 A. P
 B. r
 C. a blank space character
 D. u
 E. n

Answer 14

D. u

Question 15

What is min("Programming is fun")?
 A. P
 B. r
 C. a blank space character
 D. u
 E. n

Answer 15

C. a blank space character

Question 16

What is "Programming is fun"[-1]?
 A. Pr
 B. P
 C. fun
 D. n
 E. un

Answer 16

D. n

Question 17

Suppose that s1 and s2 are two strings, given as follows:
s1 = “Welcome to Python”
s2 = “to”
What are the results of the following expressions?
a. s1[4]
b. s1[-4]

Answer 17

a. s1[4] is o

b. s1[-4] is t

Question 18

What is "Programming is fun"[4: 6]?
 A. ram
 B. ra
 C. r
 D. pr
 E. pro

Answer 18

B. ra

Question 19

What is "Programming is fun"[-3:-1]?
 A. Pr
 B. P
 C. fun
 D. un
 E. fu

Answer 19

E. fu

Question 20

What is "Programming is fun"[:2]?
 A. Pr
 B. P
 C. Pro
 D. Programming
 E. Programming is

Answer 20

A. Pr

Question 21

In Python, all data—including numbers and strings—are actually ________.

Answer 21

objects

Question 22

Given a string s = "Programming is fun", what is s.find('rom')?
 A. 1
 B. 2
 C. 3
 D. 4
 E. -1

Answer 22

E. -1

No matching is found. It returns -1.

Question 23

The characters ‘ ‘, \t, \f, \r, and \n are called the __________ characters

Answer 23

The characters ‘ ‘, \t, \f, \r, and \n are called the whitespace characters

Question 24

Suppose s is "\t\tWelcome\n", what is s.strip()?
 A. \t\tWelcome\n
 B. Welcome\n
 C. \t\tWELCOME\n
 D. Welcome

Answer 24

D. Welcome

Hint: The s.strip() method returns a new string with the whitespace characters removed.

Question 25

The format function returns _______. A. an int B. a float C. a str

Answer 25

C. a str

Question 26

``` Suppose x is 345.3546, what is format(x, "10.3f")? (note b represents a blank space) A. bb345.355 B. bbb345.355 C. bbbb345.355 D. bbb345.354 E. bbbb345.354 ```

Answer 26

B. bbb345.355 Hint: 10.3f specifies 3 digits after the decimal point and round up the remaining digits. The total width is 10.

Question 27

Suppse number contains integer value 4, which of the following statement is correct? A. print(format(number, "2d"), format(number ** 1.5, "4d")) B. print(format(number, "2d"), format(number ** 1.5, "4.2d")) C. print(format(number, "2d"), format(number ** 1.5, "4.2f")) D. print(format(number, "2f"), format(number ** 1.5, "4.2f")) E. print(format(number, "2.1f"), format(number ** 1.5, "4.2f"))

Answer 27

C. print(format(number, "2d"), format(number ** 1.5, "4.2f")) D. print(format(number, "2f"), format(number ** 1.5, "4.2f")) E. print(format(number, "2.1f"), format(number ** 1.5, "4.2f")) Hint: number ** 1.5 is a floating-point value and must be formatted using the specifier f, not d.