Operators and Expressions Flashcards
7 cards from real Python practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Operators and Expressions flashcards as text
What does the walrus operator `:=` do in Python?
Answer: Assigns a value and returns it in the same expression
The walrus operator `:=` (assignment expression) assigns a value to a variable and simultaneously returns that value within an expression.
What is the result of `0.1 + 0.2 == 0.3` in Python?
Answer: False
Due to floating-point representation errors, `0.1 + 0.2` evaluates to `0.30000000000000004`, which is not equal to `0.3`.
What does `x **= 2` do when `x = 3`?
Answer: Sets x to 9
`**=` is the in-place exponentiation operator, so `x **= 2` is equivalent to `x = x ** 2`, giving `3 ** 2 = 9`.
What is the value of `bool(0) or bool(1)`?
Answer: True
`bool(0)` is `False` and `bool(1)` is `True`; `False or True` evaluates to `True`.
What does the expression `'abc' * 3` evaluate to?
Answer: 'abcabcabc'
The `*` operator with a string and integer repeats the string that many times, producing `'abcabcabc'`.
Which operator checks identity (same object in memory) in Python?
Answer: is
The `is` operator checks whether two variables point to the exact same object in memory, unlike `==` which checks value equality.
What is the result of `not not True`?
Answer: True
`not True` is `False`, and `not False` is `True`, so double negation returns the original value.