Write a program that asks a user for a weight in pounds (possibly fractional), and outputs the weight in kilograms. (For the record, 1 pound equals approximately 0.45359 kilograms.)

lbs = -1
while lbs < 0:
    try:
        lbs = float(input('Enter a weight in pounds: '))
        if lbs < 0:
            print('Weights must be nonnegative.')
    except ValueError:
        print('That is not a valid number.')

kg = 0.45359 * lbs
print('That is equal to', kg, 'kilograms.')

Assume that we are writing a function doSomething(word, k) which expects that parameter word is a nonempty string, and that parameter k is a nonnegative intger that has value no greater than the length of the given word.

Give an implementation of such a function that rigorously checks that the parameters adhere to these expectations. (Once you've performed the parameter-checking, you don't need to do anything within the function body.)

def doSomething(word, k):
    if not isinstance(word, str):
        raise TypeError('word must be a string')
    if len(word) == 0:
        raise ValueError('word must be nonempty')
    if not isinstance(k, int):
        raise TypeError('k must be an integer')
    if k < 0:
        raise ValueError('k must be nonnegative')
    if k > len(word):
        raise ValueError('k must be no greater than the length of the word')