lists and tuples

[John Hunter]

>>>>> "Gerrit" == Gerrit Holl <gerrit at nl.linux.org> writes:

    Gerrit> I don't understand. I really don't understand.

For me, the most important distinction is that because lists are
mutable, they cannot be used as keys in a dictionary.  Because tuples
are immutable, they can.

  d = {}
  l = [1,2]
  t = (1,2)

  d[l] = 'Nope'  # TypeError: list objects are unhashable
  d[t] = OK'

I find myself using tuples very often as keys for dictionaries.

John Hunter