# 1601.py

print filter (lambda x: ord(x)<68,'ABCDEAB')
# ABCAB

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

def pari (x): return x%2==0

v=xrange(1,21)
print filter(pari,v)
# [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]

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

v=['Roma','Ferrara','Bologna','Pisa']
print filter(lambda x: len(x)>4,v)
# ['Ferrara', 'Bologna']

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

imp = [['Rossi',2000],['Verdi',3000],
  ['Gentili',1800],['Bianchi',3400],
  ['Tosi',1600],['Neri',2800]]
imp3000=filter(lambda x: x[1]>=3000,imp)
for x in imp3000: print x[0],
print # Verdi Bianchi

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

def controimmagine(f,lx,lb):
  c=[]
  return filter(lambda x: f(x) in lb,lx)

def f (a): (x,y)=a; return x+y

la=[[1,1],[2,3],[1,2],[0,1],[0,4],[2,2],[1,0]]
for x in la: print x,f(x)
print controimmagine(f,la,[1,4])
# [1, 1] 2
# [2, 3] 5
# [1, 2] 3
# [0, 1] 1
# [0, 4] 4
# [2, 2] 4
# [1, 0] 1
# [[0, 1], [0, 4], [2, 2], [1, 0]]