Which of the following functions checks if a variable matches a specific type?

The function that checks if a variable matches a specific type is indeed the one mentioned in the correct answer. This function, isinstance(), is built into Python and is used to determine if an object is an instance of a particular class or a subclass thereof.

Using isinstance(object, classinfo), you can directly check:

• If object is an instance of a type or a tuple of types, which allows for checking against multiple types at once.

• This is particularly useful in situations where you want to enforce type constraints or validate data types before proceeding with operations that depend on specific type characteristics.

For example, using isinstance(x, int) will return True if x is an integer, and False otherwise.

Other functions listed do not serve this purpose: while isnan() is used to check for "Not a Number" values in floating-point arithmetic, and isdtype() pertains to checking data types within a specific library (like NumPy), neither is used for verifying if a variable matches a specific Python type. isvalue() is not a recognized function in standard Python for type checking. Thus, isinstance() is the appropriate tool for determining a variable