How can I check that a list has one and only one truthy value?

Question

In python, I have a list that should have one and only one truthy value (that is, bool(value) is True). Is there a clever way to check for this

Answer 1

You can do:

x = [bool(i) for i in x]
return x.count(True) == 1

Or

x = map(bool, x)
return x.count(True) == 1

Building on @JoranBeasley's method:

sum(map(bool, x)) == 1