In Python:
A list uses square brackets [1, 2, 3]
When you use parentheses, that's a tuple (1, 2, 3)
You can read more here
You don't need the parentheses around petals in the return line.

That code isn't ok, the error message is explicit about what's wrong there, this is the original code:

def how_much_i_love_you(nb_petals):
    # your code

where nb_petals is a number, I don't know why you use () in tears there, if you want to declare a list, use []
If you want to use % both operands must be numbers. I can only guess that petals is a list there (given the error message).

Isn't petals a list there? You can't use modulo operator between a list and an int. You also missed a ) there.