m=124; x=87345.99
a='%3d %-12.4f' %(m,x)
print a
124 87345.9900
---------------------------------------
a='u=%6.2f\nv=%6.2f' %(u,v)
print a
# Output:

u=12345.67
v= 20.00
---------------------------------------
a=58; b=11; c=6
print '%2x%2x%2x' %(a,b,c)
# 3a b 6
---------------------------------------
print '%02x%02x%02x' %(a,b,c)
# 3a0b06
---------------------------------------
a='Ferrara'; b='Roma'; c='Rovigo'
m=max(len(a),len(b),len(c))
print '|%*s|\n|%*s|\n|%*s|' \
  %(m,a,m,b,m,c)
---------------------------------------
|Ferrara|
|   Roma|
| Rovigo|
---------------------------------------
u=(7,3,5)

print "cosicche' a=%d, b=%d, c=%d" %u
# cosicche' a=7, b=3, c=5
---------------------------------------
stati=dict(Afghanistan=[652000,21000],
  Giordania=[89000,6300],
  Mongolia=[1587000,2580],
  Turchia=[780000,65000])

formato='%-11s | %14s | %7s'
print formato %('stato',
  'superficie/kmq','ab/1000')
print '-'*38
voci=stati.keys(); voci.sort()
for x in voci:
  stato=stati[x]
  print formato %(x,stato[0],stato[1])
---------------------------------------
stato       | superficie/kmq | ab/1000
--------------------------------------
Afghanistan |         652000 |   21000
Giordania   |          89000 |    6300
Mongolia    |        1587000 |    2580
Turchia     |         780000 |   65000
---------------------------------------
a='terra'
b=list(a); b.reverse()
print a
# terra
print b
# ['a', 'r', 'r', 'e', 't']
---------------------------------------
b=''.join(b); print b
# arret
---------------------------------------
def invertistringa (a):
  b=list(a); b.reverse()
  return ''.join(b)

a='acquario'
b=invertistringa(a)
print a
# acquario
print b
# oirauqca