u=4
print eval('u*u+7')
# 23

def f (x): return x+5

print eval('f(2)+17')
# 24

print eval('f(u+1)')
# 10

def sommaf (F,x,y):
  f=eval(F); return f(x)+f(y)

def cubo (x): return x*x*x

print sommaf('cubo',2,5)
# 133
---------------------------------------
def sommaf (F,x,y):
  f=globals()[F]; return f(x)+f(y)
---------------------------------------
a='x=8; y=6; print x+y'

exec(a)
# 14
---------------------------------------
x=0; comando='x=17'

def f ():
  global x
  exec comando

f(); print x
# 0
---------------------------------------
x=0; comando='global x; x=17'

def f ():
  exec comando

f(); print x
# 17
---------------------------------------
a=[1,3,-5,0,-3,7,-10,3]
a.sort(key=abs)
print a
# [0, 1, 3, -3, 3, -5, 7, -10]
---------------------------------------
a=[3454,819,99,4545,716,310]
a.sort(key=lambda x: x%100)
print a
# [310, 716, 819, 4545, 3454, 99]
---------------------------------------
def conflun (a,b):
  if len(a)<len(b): return -1
  if len(a)==len(b): return 0
  return 1

v=[[6,2,0],[9,1],[4,5,8,3],[3,1,7]]
v.sort(cmp=conflun)
print v
# [[9,1],[6,2,0],[3,1,7],[4,5,8,3]]
---------------------------------------
t=time.localtime()
print t
# (2006, 2, 8, 19, 48, 23, 2, 39, 0)
# anno, mese, giorno, ora, minuti, secondi,
# giorno della settimana (0 = lunedi'),
# giorno nell'anno, 1 se tempo estivo.

print time.strftime('%d %b %Y, %H:%M',t)
# 08 Feb 2006, 19:54

print time.ctime()
# Wed Feb  8 19:50:20 2006

print time.time() # Meglio time.clock().
# 1139424643.05
for i in range(1000000): pass
print time.time() # Meglio time.clock().
# 139424643.23