Question

这是我的代码：

lock.trylock()

我正在尝试制作一个python预测计算器网络应用程序。我找不到错误。我尝试使用简单的“eval”函数进行此操作并且它可以工作，但是当我自己创建函数来计算接收到的输入时，它会得到错误。我该如何解决这个问题？

回溯：

#!/usr/bin/env python
from flask import Flask, request

# create app
app = Flask(__name__)


def calculate(r,t,l):
    return ((l+t)/2)*3


def forecast(rem, sold1, sold2):


     if (rem == 0 and sold1 == 0 and sold2 ==0): #All ZERO
         result = 15
     elif (rem == 0 and sold1 == 0 and sold2 < 10): #ALL FOR ONE PRODUCT VALUE
         result = sold2*3
     elif (rem == 0 and sold1 < 10 and sold2 ==0):
         result = sold1*3
     elif (rem < 10 and sold1 == 0 and sold2 == 0):
         result = rem*3
     #END FOR ONE PRODUCT VALUE
     elif (rem>= 10 and  sold1>=10 and sold2>=10):

          if((rem/3)>=(sold1+10) or (rem/3)>=(sold1+10)):
              result = 0
          else:
              result = calculate(rem,sold1,sold2)-rem
     elif (rem<10 and sold1<10 and sold2<10):
         result = calculate(rem,sold1,sold2)
     elif (rem == 0 and sold1>=10 and sold2>=10):
         result = calculate(rem,sold1,sold2)
     else:
         result = sold1



     print ("\n\nSuggested stock purchase: ")


     return result


@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'GET':
        # show html form
        return '''
            <form method="post">
                <input type="text" name="remaining" />
                <input type="text" name="sold1" />
                <input type="text" name="sold2" />

                <input type="submit" value="forecast" />
            </form>
        '''
    elif request.method == 'POST':
        # calculate result
        rem = request.form.get('remaining')
        sold1 = request.form.get('sold1')
        sold2 = request.form.get('sold2')

        result = forecast(rem,sold1,sold2)
        return 'result: %s' % result

Answer 1

问题是，烧瓶为str var提供了rem。你需要做的就是替换这一行： rem = request.form.get('remaining')

用这个：

rem = int(request.form.get('remaining'))

您也可以为其他变量执行此操作

Answer 2

您从表单获得的数据类型不是int而是unicode，您可以将它们转换为所需类型int，然后将其传递给forecast：

result = forecast(int(rem),int(sold1),int(sold2))

Answer 3

rem = request.form.get('remaining')

是一个字符串，而不是int。

您可以通过

进行转换

rem = int(request.form.get('remaining'))

Flask Python Calculator 500内部服务器错误

3 个答案: