Python Data Types and Variables 5

Question 1

What is the result of `type(lambda: None)`?

Accepted Answer

Answer

Lambda expressions create anonymous functions; their type is `function`.

Question 2

How do you check if variable `x` is of type `str` using the recommended approach?

Accepted Answer

isinstance(x, str)

Answer

`isinstance(x, str)` is preferred because it also handles subclasses of `str`.

Question 3

What does Python's dynamic typing mean?

Accepted Answer

Variable types are determined and can change at runtime

Answer

In Python, type is associated with the object, not the variable, and the same name can point to objects of different types at runtime.

Question 4

What is the value of `int(3.9)`?

Accepted Answer

3

Answer

`int()` truncates toward zero, so `int(3.9)` is `3`, not 4.

Question 5

Which Python keyword is used to annotate a variable's type without assigning it?

Accepted Answer

:

Answer

PEP 526 syntax `x: int` annotates the variable type using a colon without assignment.

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