Subtracting two lists in Python

Question

In Python, How can one subtract two non-unique, unordered lists? Say we have a = [0,1,2,1,0] and b = [0, 1, 1] I\'d like to do something like

Answer 1

I know "for" is not what you want, but it's simple and clear:

for x in b:
  a.remove(x)

Or if members of b might not be in a then use:

for x in b:
  if x in a:
    a.remove(x)