How can I write a function that returns all negative numbers as well as checks if the input are only integers and floating point numbers? [duplicate]

Question

Write a function find_negatives that takes a list l of numbers as an argument and returns a list of all negative numbers in l. If there are no negative numbers in l, it returns an empty list.

def find_negatives(l):
    l_tmp = []
    for num in l:
        if num < 0:
            l_tmp.append(num)
    return l_tmp

#Examples
find_negatives([8, -3.5, 0, 2, -2.7, -1.9, 0.0])     # Expected output: [-3.5, -2.7, -1.9]
find_negatives([0, 1, 2, 3, 4, 5])                   # Expected output: []

This is part I am having trouble with below:

Write a function find_negatives2 that works the same as find_negatives with the following two additions:

If l is not a list, it returns the string "Invalid parameter type!" If any of the elements in l is neither an integer nor a floating pointer number, it returns the string "Invalid parameter value!"

What I have so far

def find_negatives2(l):
    l_tmp1 = []
    if type(l) != list:
        return "Invalid parameter type!"
    else:
       for num in l:

Examples:
find_negatives2([8, -3.5, 0, 2, -2.7, -1.9, 0.0])      # Expected output: [-3.5, -2.7, -1.9]
find_negatives2([0, 1, 2, 3, 4, 5])                    # Expected output: []
find_negatives2(-8)                                    # Expected output: 'Invalid parameter type!'
find_negatives2({8, -3.5, 0, 2, -2.7, -1.9, 0.0})      # Expected output: 'Invalid parameter type!'
find_negatives2([8, -3.5, 0, 2, "-2.7", -1.9, 0.0])    # Expected output: 'Invalid parameter value!'
find_negatives2([8, -3.5, 0, 2, [-2.7], -1.9, 0.0])    # Expected output: 'Invalid parameter value!'

I am not sure how to proceed. I am not sure how to check each type within the list

Answer 1

You're on the right track; you just need to make a loop for type comparisons:

# (...)
else:
    for num in l:
        if type(num) not in (int, float):
            return "Invalid parameter type!"
        # (...)

Answer 2

You can achieve what you are looking for with:

def find_negatives(l):
    if type(l) != list or any(str(x).isnumeric() for x in l) == False:
        return 'Invalid parameter type!'
    l_tmp = []
    for num in l:
        if num < 0:
            l_tmp.append(num)
    return l_tmp

All you have to do is check whether the input is a list and if any element of the input is not a number.