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 expression `lambda x: x * 2` create?
Answer: An anonymous function that doubles its argument
`lambda x: x * 2` creates an anonymous (lambda) function that takes one argument and returns it multiplied by 2.
What is the result of `True + True + False` in Python?
Answer: 2
In Python, `True` equals `1` and `False` equals `0` in arithmetic contexts, so `1 + 1 + 0 = 2`.
Which expression correctly checks if a variable `n` is between 1 and 10 (inclusive)?
Answer: 1 <= n <= 10
Python supports chained comparisons, so `1 <= n <= 10` is the correct and idiomatic way to check a range.
What is the value of `~5` in Python?
Answer: -6
The bitwise NOT operator `~` inverts all bits; for integer `n`, `~n` equals `-(n + 1)`, so `~5 = -6`.
What does `a, b = b, a` demonstrate in Python?
Answer: Tuple unpacking for variable swapping
Python evaluates the right side as a tuple `(b, a)` first, then unpacks it into `a` and `b`, effectively swapping them.
What is the result of `2 ** 3 ** 2` in Python?
Answer: 512
The `**` operator is right-associative, so `2 ** 3 ** 2` is evaluated as `2 ** (3 ** 2) = 2 ** 9 = 512`.
What does `5 | 3` evaluate to in Python?
Answer: 7
`5` is `101` and `3` is `011` in binary; bitwise OR gives `111`, which is `7`.