# 55285A: Advanced Python Quiz Questions and Answers

### What is the output of print (0.1 + 0.2)?

• none of the above

Explanation :

Neither of 0.1, 0.2 and 0.3 can be represented accurately in binary. The round off errors from 0.1 and 0.2 accumulate and hence there is a difference of 5.5511e-17 between (0.1 + 0.2) and 0.3.

### If a={5,6,7}, what happens when a.add(5) is executed?

• a={5,6,7}

Explanation :

There exists add method for set data type. However 5 isn't added again as set consists of only non-duplicate elements and 5 already exists in the set. Execute in python shell to verify.

### What is the result of round(0.5) - round(-0.5)?

• 0

Explanation :

Python rounds off numbers away from 0 when the number to be rounded off is exactly halfway through.

### What is the type of inf?

• Float

Explanation :

Infinity is a special case of floating point numbers. It can be obtained by float('inf').

### Which of the following is invalid?

• <p>None of the mentioned</p>

Explanation :

All the statements will execute successfully but at the cost of reduced readability.