when to use float in python code example

Example 1: python is float

def is_number(x):
    '''
        Takes a word and checks if Number (Integer or Float).
    '''
    try:
        # only integers and float converts safely
        num = float(x)
        return True
    except ValueError as e: # not convertable to float
        return False

Example 2: float python

#Float or int like this - 2.6, 5.7, 1.89 etc

a = 90.7
print(a, 'is a float')