from string import *
def stringgen():## Calling function.
    target1 = 'atgacatgcacaagtatgcat'
    target2 = 'atgaatgcatggatgtaaatgcag'
    print target1,target2
    a=find(target1,"atgc")
    print a
    countSubStringMatch(target1,"atgc")

def countSubStringMatch(target,key):
                    ''' Finds the count for the number of matches of a substring'''
     count=0
     pointer=0
     pointerlist=[]
     print len(target)

     while(pointer<len(target)):
         pointer=find(target[pointer:],key)# initially pointer zero, and then takes slices off the input string for further comparison
         if pointer==-1:# No match scenario
             break
         if pointer!=-1:# Match scenario
             pointerlist.append(pointer)# create a list of match locations
             print pointer
             count+=1
             print target[pointer:]
             raw_input()
         pointer+=1# End of while loop , supposed to  cycle through input string but not happening, going into infinite loop , any idea why this could be happening? :?

     ## To print the list of locations with a match and the number of instances of match
     for i in pointerlist:
         print 'List elements',i
     print 'Count',count