num = 3
if num !=1:
  print num
if num ==3:
  print num + 1
if num ==4:
  print num
else:
  print num-1
if num !=1 and num !=4:
  print "and  "+str(num)
if num !=3 or num ==3:
  print "or  "+str(num)

-------------------------------output---------------------
kondo@kondo-PC ~/python
$ python if.py
3
4
2
and  3
or  3