Quick and Painless Tutorial (cont)

 # deleting something from a list, or deleting a variable
 del var # var = 1 is now an error!
 a = [1,2,3]; del a[-1] # a == [1,2]

 # tuples (collection of values) are immutable
 (1,2)
 (1,)
 t = ('a', 1, 0L) 
 x,y,z = t

 # dictionaries (aka associative arrays)
 d = {1: 9000, 'aa': 9001}
 d[1] = 7
 del d['aa']
 d.keys()
 d.has_key(7)

 # more conditionals
 lst = ['a', 'c', 'd']
 # ('a' in lst) == 1, ('b' not in lst) == 0

 lst2 = lst[0:len(lst)]
 # (lst is not lst2) == 1