python blind practice

• Demand: irregular listing singlelist3 = [ 'total', 'per ton of artificial:', 'total man', 1748.07, 'amount'], if the current position of the next adjacent element and the element is a string of characters remains string, then insert 0 after the number of the element, as singlelist3 = [ 'total', 0.00 'artificial ton:', 0.00 'total man', 1748.07, 'amount', 0.00]

def expandstr(mylist):
    if isinstance(mylist[-1],str):
        mylist.append(0.00)
    indexlist = []
    i=0
    while i<len(mylist)-1:
        myval = mylist[i]
        if isinstance(mylist[i+1], str) and isinstance(myval, str):
            indexlist.append(i)
        else:
            print("hi")
        i+=1
    indexlist=list(map(lambda x:x+1,indexlist))
    mylist.insert(indexlist[0],0.00)
    i=1
    while i<len(indexlist):
        mylist.insert(indexlist[i]+1,0.00)
        i+=1
    print("expand: ",indexlist)
    print("expand: ",mylist)