# 0101.py

latino = {'casa': 'domus',
  'villaggio': 'pagus',
  'nave':'navis', 'campo':'ager'}
voci=sorted(latino.keys())
for x in voci:
  print '%-9s = %s' %(x,latino[x])

# output:
# campo     = ager
# casa      = domus
# nave      = navis
# villaggio = pagus

#######################################

def dnanumerico (x):
  x=x.lower()
  sost={'g': 0, 'a': 1, 'c': 2, 't': 3}
  return sost[x]

g='TGAATGCTAC'
print map(dnanumerico,g)
# [3, 0, 1, 1, 3, 0, 2, 3, 1, 2]