How to Check if a Variable is an Integer in Python?

Determining if a Variable is an Integer in Python

Verifying whether a variable holds an integer value is a common task in Python. To achieve this, you can utilize the isinstance() function.

In Python 3.x:

isinstance(<var>, int)</var>

In Python 2.x:

isinstance(<var>, (int, long))</var>

This ensures that the variable is of type int. However, it's important to note that using type is generally not recommended in Python.

Alternative Approach: Exception Handling

An alternative to using isinstance() is to assume the variable is an integer and handle exceptions if it's not. This approach, known as "asking for forgiveness rather than permission," can be simpler:

try:
    <var> += 1
except TypeError:
    ...</var>

Strong Polymorphism

In Python, strong polymorphism encourages you to consider objects that behave like integers rather than strictly requiring them to be integers. However, abstract base classes offer a more refined approach, allowing you to specify precise properties and behaviors for your objects.

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