BlockPy: #$41\mathrm{.}8)$ Extract Key

Write a function extract$\_$key that consumes a key and a list of dictionaries, and returns a list of just the values associated with that key. For example, in the function call below, the list $[18,16,2]$ would be returned. Note that your function should work for any list of dictionaries, not just a list of animals like the one shown. Therefore, you can use $[$dict$]$ as your type parameter, and you can use list as your return type.