Python Operators and Expressions 4

Question 1

What does the expression `lambda x: x * 2` create?

Accepted Answer

An anonymous function that doubles its argument

Answer

`lambda x: x * 2` creates an anonymous (lambda) function that takes one argument and returns it multiplied by 2.

Question 2

What is the result of `True + True + False` in Python?

Accepted Answer

2

Answer

In Python, `True` equals `1` and `False` equals `0` in arithmetic contexts, so `1 + 1 + 0 = 2`.

Question 3

Which expression correctly checks if a variable `n` is between 1 and 10 (inclusive)?

Accepted Answer

1 <= n <= 10

Answer

Python supports chained comparisons, so `1 <= n <= 10` is the correct and idiomatic way to check a range.

Question 4

What is the value of `~5` in Python?

Accepted Answer

-6

Answer

The bitwise NOT operator `~` inverts all bits; for integer `n`, `~n` equals `-(n + 1)`, so `~5 = -6`.

Question 5

What does `a, b = b, a` demonstrate in Python?

Accepted Answer

Tuple unpacking for variable swapping

Answer

Python evaluates the right side as a tuple `(b, a)` first, then unpacks it into `a` and `b`, effectively swapping them.

Python Practice Test