python:获取ValueError：对于带有基数为10的int（）的无效文字：”错误并且不知道原因

Getting a ValueError: invalid literal for int() with base 10: '' error and don't know why

我知道以前有人问过这个问题，但就我的情况而言，我似乎不明白为什么要扔这个。

当我尝试运行我的计算时，控制台会给我这个错误：

ValueError: invalid literal for int() with base 10: ''。

它说它来自

1 2	File"/var/sites/live_mbpathways/moneybroker/apps/investments/ajax.py", line 30, in calc_cdic investments = Investment.objects.all().filter(plan = plan, financial_institution=fiid, maturity_date__gte = now).order_by('maturity_date').exclude(id=investment_id)

有人知道为什么会这样吗？

这是我的ajax.py代码所在的位置：

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@login_required
@moneybroker_auth
@csrf_exempt
def calc_cdic(request, plan, investment_id=None, *args, **kwargs):
from investments.models import Investment
from financial_institutions.models import FinancialInstitution
from profiles.models import Profile
from plans.models import Plan
from datetime import datetime
now = datetime.now()
json = {}
data = request.POST

if request.is_ajax():
total = 0
fiid = data.get('financial_institution')
amt = data.get('amount') or 0
pay_amt = data.get('pay_amount') or 0
mat_amt = data.get('maturity_amount') or 0
investments = Investment.objects.all().filter(plan = plan, financial_institution=fiid, maturity_date__gte = now).order_by('maturity_date').exclude(id=investment_id)
for i in investments:
total += i.maturity_amount
print total
json['total'] = float(str(total))
json['amt'] = float(str(amt))
json['pay_amt'] = float(str(pay_amt))
json['mat_amount'] = float(str(mat_amt))
json['fiid'] = fiid
print json

return HttpResponse(simplejson.dumps(json), mimetype='application/json')

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