new_contents: #!/usr/local/bin/python
  #print 'Age:',42
  #print 1,2,3
  #print (1,2,3)
  #print 'Hello'+','+'world!'
  #print 'Hi',
  #print 'Y'
  #x,y=1,2
  #print x,y
  #x,y=y,x
  #print x,y
  #x,y,res=[1,2,3,4]
  #print res
  #a=2
  #a+=2
  #print a
  #print bool(''),bool({}),bool([]),bool(0),bool(None)
  #x=y=[1,2,3]
  #z=[1,2,3]
  #print x==z
  #print x is z
  #b=4
  #c= b*3 if b<5 else b
  #print c
  #x=1
  #while x<=5:
  #  print x
  #  x+=1
  #print x
  #for i in range(0,3):
  #  print i
  #d={'a':1,'b':2}
  #for k in d:
  #  print k,d[k]
  #a=['x','y','z']
  #b=[1,2,3]
  #for i in zip(a,b):
  #  print a,b
  #for i in zip(xrange(0,5),xrange(122)):
  #  print i
  #print sorted([3,5,2])
  #print reversed([3,5,4])
  #print [ x*x for x in range(0,10) if x%3==0 ]
  girls=['alice','bernice','clarice']
  boys=['chris','arnold','bob']
  letterGirls={}
  for girl in girls:
    letterGirls.setdefault(girl[0],[]).append(girl)
  print letterGirls
  print [b+'+'+g for b in boys for g in letterGirls[b[0]]]
  a={'x':1,'y':2}
  b=a
  print b
  a=None
  #del b
  print b
  exec 'print "Hello!"'
  from math import sqrt
  scope={}
  exec 'sqrt=1' in scope
  print sqrt(4)
  print scope['sqrt']
  print scope.keys()
  scope['x']=2
  scope['y']=3
  print eval('x*y',scope)
  
subject: Add conditions.