solutions

Is Numeric

Write a function is_numeric that receives a parameter and returns True if it's numeric (it is, an int or a float). Examples:

is_numeric(10)  # True, it's an int
is_numeric('10')  # False, it's a string

is_numeric(0.1)  # True, it's a float
is_numeric('0.5')  # False, it's a string

is_numeric(True)  # False! It's a boolean, *SEE NOTES BELOW*
is_numeric(False)  # False! It's a boolean, *SEE NOTES BELOW*

Quick note about booleans

Booleans in python are tricky. For example, if you check if True (a boolean) "is an instance of int" using the isinstance function, the answer will be True. That means that booleans are instances of integers, it's a "subtype". Examples:

# Boolean values are subtypes of ints
isinstance(True, int)  # True
isinstance(False, int)  # True

Don't worry too much about this. In these cases it's recommended to use the type function instead. type of a boolean value will return bool:

type(True)  # bool
type(False)  # bool
type(10)  # int
type(0.5)  # float

Test Cases

test with boolean - Run Test

def test_with_boolean():
    assert is_numeric(True) == False

test with float - Run Test

def test_with_float():
    assert is_numeric(0.8) == True

test with integer - Run Test

def test_with_integer():
    assert is_numeric(22) == True

test with string - Run Test

def test_with_string():
    assert is_numeric('Hello World') == False