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Calculate monthly average from list

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Nov 12th, 2012
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  1.  #This function creates a monthly average from list with
  2.  #such structure (["%Y-%m-%d %H:%M:%S", float],["%Y-%m-%d %H:%M:%S", float]..)
  3.  
  4. def monthlyAverage(array):
  5.     tmpMonthArray=[[]*12 for x in xrange(12)]
  6.     resultArray=[]
  7.     for eachPair in array:
  8.         #print eachPair[0]
  9.         dateObjekts=datetime.datetime.strptime(eachPair[0],"%Y-%m-%d %H:%M:%S")
  10.         menesis=dateObjekts.month
  11.         tmpMonthArray[menesis-1].append(eachPair[1])
  12.     i=1
  13.     for each in tmpMonthArray:
  14.         resultArray.append([i,sum(each)/len(each)])
  15.         i+=1    
  16.     print resultArray
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