Choosing a random element from a list [duplicate]

This question already has an answer here:

• How do I randomly select an item from a list using Python? 10 answers

How can I choose a random element from a list in Python 3 ?

l=[1,2.1,"c",[4]]     #for example

Now I want to use some functions, method or whatever, that will return a random element every time I apply it to l.