Pythonic way to check if: all elements evaluate to False -OR- all elements evaluate to True

Question

I want the results of the function to be:

• All values evaluate to False (None, 0, empty string) -> True
• All values evaluate to True -> True
• Every

Answer 1

Just yet another way of doing it, given list l:

sum([int(bool(x)) for x in l]) in (0, len(l))

>>> a=['',None,0,False]
>>> b=[1,True,'ffffd']
>>> c=[0,1,False,True,None]
>>> for l in (a,b,c):
...  print sum([int(bool(x)) for x in l]) in (0, len(l))
... 
True
True
False