def find_Positions_Word(text,word):
    p=text.find(word)
    if p<0 :
        print "The word "+word+" is not exist in this text"
        return 0
    else:
        list_position=[]
        list_position.append(p)
        while p>=0:
            p=text.find(word,p+1)
            if p>=0:
                list_position.append(p)
        print "The word "+word+" is repated " + str(len(list_position)) +" times in this text"
        print "The position of this word in the text at :"
        print list_position
        return len(list_position)


t='''Hello ! every on ! i am python, i like every body use python , python is beautiful ,
python is habby ,Good luck python'''
n1=find_Positions_Word(t,'python')
t1=t.replace('python','Java',n1)
print t1
print"------------------------"
t2="I am learning the programming with python"
n2=find_Positions_Word(t2,'python')
t22=t2.replace('python','Java',n2)
print t22
print"------------------------"
t3="Save the world"
find_Positions_Word(t3,'python')