How to Check if a Variable is a Number in Python | Tech Wiki Online

How to Check if a Variable is a Number in Python

When working with variables in Python, it’s often necessary to determine whether a variable is a number. There are a few simple methods you can use to achieve this.

Method 1: Using the Type Function

One way to check if a variable is an integer is by using the type() function. This function takes the variable as an argument and returns its type. To check if a variable is an integer, you can compare the result of type() to the int class.

Example:

age = 1
type(age) == int  # True

Similarly, you can use type() to check if a variable is a floating-point number. In this case, compare the result to the float class.

Example:

fraction = 0.1
type(fraction) == float  # True

Method 2: Using the isinstance() Function

An alternative method to check if a variable is a number is by using the isinstance() function. This function takes two arguments: the variable and the desired class. To check if a variable is an integer, you can use isinstance() with the int class as the second argument.

Example:

age = 1
isinstance(age, int)  # True

Similarly, you can use isinstance() to check if a variable is a floating-point number. In this case, use the float class as the second argument.

Example:

fraction = 0.1
isinstance(fraction, float)  # True

Using these methods, you can easily determine whether a variable is a number in Python.