Python Questions and Answers Part-12

1. What will be the output of the following Python code?
>>>print (r"\nhello")
a) a new line and hello
b) \nhello
c) the letter r and then hello
d) error

Answer: b
Explanation: When prefixed with the letter ‘r’ or ‘R’ a string literal becomes a raw string and the escape sequences such as \n are not converted.

2. What will be the output of the following Python statement?
>>>print('new' 'line')
a) Error
b) Output equivalent to print ‘new\nline’
c) newline
d) new line

Answer: c
Explanation: String literal separated by whitespace are allowed. They are concatenated.

3. What will be the output of the following Python statement?
>>> print('x\97\x98')
a) Error
b) 97
98
c) x\97
d) \x97\x98

Answer: c
Explanation: \x is an escape sequence that means the following 2 digits are a hexadecimal number encoding a character.

4. What will be the output of the following Python code?
>>>str1="helloworld"
>>>str1[::-1]
a) dlrowolleh
b) hello
c) world
d) helloworld

Answer: a

5. What will be the output of the following Python code?
print(0xA + 0xB + 0xC)
a) 0xA0xB0xC
b) Error
c) 0x22
d) 33

Answer: d
Explanation: 0xA and 0xB and 0xC are hexadecimal integer literals representing the decimal values 10, 11 and 12 respectively. There sum is 33.

6. What is “Hello”.replace(“l”, “e”)?
a) Heeeo
b) Heelo
c) Heleo
d) None

Answer: a
Explanation: Execute in shell to verify.

7. To retrieve the character at index 3 from string s=”Hello” what command do we execute ?
a) s[]
b) s.getitem(3)
c) s.__getitem__(3)
d) s.getItem(3)

Answer: c
Explanation: __getitem(..) can be used to get character at index specified as parameter.

8. To return the length of string s what command do we execute?
a) s.__len__()
b) len(s)
c) size(s)
d) s.size()

Answer: a

9. To check whether string s1 contains another string s2, use ________
a) s1.__contains__(s2)
b) s2 in s1
c) s1.contains(s2)
d) si.in(s2)

Answer: a
Explanation: s2 in s1 works in the same way as calling the special function __contains__ .

10. What function do you use to read a string?
a) input(“Enter a string”)
b) eval(input(“Enter a string”))
c) enter(“Enter a string”)
d) eval(enter(“Enter a string”))

Answer: a