python瞎练

• 需求：有不规则列表 singlelist3 = [ '总计', '每吨人工：', '总人工', 1748.07, '金额']，如果当前元素为字符串且该元素的下一个相邻位置仍为字符串，那么请在该元素后面插入数字0，如同 singlelist3 = [ '总计',0.00， '每吨人工：',0.00， '总人工', 1748.07，‘金额’，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)

•  需求2：有列表 saiwa=['', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '每吨人工：', '', 90.0, '', '', '总人工', 1748.07, '', ''],去除所有空格，这个需求不用递归，而采用遍历并判断元素是否为'',从而决定是否删除时总会遇到删不干净的情况，甚为奇怪 

saiwa=['', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '每吨人工：', '', 90.0, '', '', '总人工', 1748.07, '', '']
print(len(''))
def delempty(mylist):
    if '' in mylist:
        mylist.pop(mylist.index(''))
        delempty(mylist)
    return mylist
saiwa=delempty(saiwa)
print('finally:',saiwa)