Python Interview Questions
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Python - Arithmetic Operators
1. Increment val_1 by 2?
A) val_1 + + 2
B) val_1 += 2
C) val_1 + + 2
Answer: val_1 += 2
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2. What is the result of the following expression: 2 + 10 * 5 + 3 * 2 ?
A) 126
B) 58
C) 110
D) 112
Answer: 58
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3. What is the result of the following expression: 6 * 8 / 2**3 - 2 * 2?
A) 8
B) 27644
C) 2
D) 13820
Answer: 2
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4. What is the result of running the following code 1/2 * 2 # + 1:
A) 2.0
B) 1
C) 1.0
D) Nothing happens at all
Answer: 1
Explanation: The comment prevents the latter half of the line from running, so we only get 1/2 * 2 which is 1.0
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5. Which of the following result in integers in Python?
A) 6/2
B) 5 // 2
C) 6.5 * 2
Answer: 5 // 2
Explanation: Even though the numbers do not cleanly divide, the double slash // is division that results in an integer in Python.
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6. What is the result of 111 % 7
A) 15.8571428571428
B) 105
C) 6
Answer: 6
Explanation: 6 is the remainder. We can do 111 / 7, which is floored at 15. So then 15 * 7 = 105; to get to 111 we need 6 more.
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7. What type does the following expression result in 1.0 + 4 ?
A) Integer
B) Float
Answer: Float
Explanation: Whenever doing math with both floats and ints, the result is a float. Otherwise, we would potentially lose any of our data after the decimal point,.
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8. How can we add parenthesis to the following expression to make it equal 100: 1 + 9 * 10 ?
A) (1 + 9) * 10
B) It already equals 100
C) (1 + 9 * 10)
D) 1 + (9 * 10)
Answer: (1 + 9) * 10
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9. What is the result of 16 // 6
A) 2
B) 2.666666666665
C) 3
Answer: 2
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