Python Operators and Expressions 2

Question 1

What does the walrus operator `:=` do in Python?

Accepted Answer

Assigns a value and returns it in the same expression

Answer

The walrus operator `:=` (assignment expression) assigns a value to a variable and simultaneously returns that value within an expression.

Question 2

What is the result of `0.1 + 0.2 == 0.3` in Python?

Accepted Answer

False

Answer

Due to floating-point representation errors, `0.1 + 0.2` evaluates to `0.30000000000000004`, which is not equal to `0.3`.

Question 3

What does `x **= 2` do when `x = 3`?

Accepted Answer

Sets x to 9

Answer

`**=` is the in-place exponentiation operator, so `x **= 2` is equivalent to `x = x ** 2`, giving `3 ** 2 = 9`.

Question 4

What is the value of `bool(0) or bool(1)`?

Accepted Answer

True

Answer

`bool(0)` is `False` and `bool(1)` is `True`; `False or True` evaluates to `True`.

Question 5

What does the expression `'abc' * 3` evaluate to?

Accepted Answer

'abcabcabc'

Answer

The `*` operator with a string and integer repeats the string that many times, producing `'abcabcabc'`.

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