将代码转换为python中的函数

Question

您好我在使用python 3.6中的现有函数制作速率函数时遇到问题我不断收到错误TypeError: float() argument must be a string or a number, not 'StringVar'或TypeError: can't multiply sequence by non-int of type 'Tag'。我通常在做这类事情时没有任何问题。

这是第一个功能。

def results():
    if running:
        cur1 = listbox1.get('active')
        cur2 = listbox2.get('active')

        t = datetime.utcnow()  
        url1  = "http://www.xe.com/currencyconverter/convert/" + "?Amount=" + amountex + "&From=" + cur1 + "&To=" + cur2
        url2 = "http://www.xe.com/currencyconverter/convert/" + "?Amount=" + amountex + "&From=" + cur2 + "&To=" + cur1


        html_code1 = requests.get(url1).text
        html_code2 = requests.get(url2).text

        soup1 = BeautifulSoup(html_code1, 'html.parser')
        soup2 = BeautifulSoup(html_code2, 'html.parser')

        rate1 = soup1.find('span', {'class', 'uccResultAmount'})
        rate2 = soup2.find('span', {'class', 'uccResultAmount'})

        lblfrmex_text.set(rate2.contents[0])
        lbltoex_text.set(rate1.contents[0])
        lbldatetime_text.set(t)
#Then do a whole bunch of calculations.

这就是我的尝试。

def getrates(curA, curB):
        url1  = "http://www.xe.com/currencyconverter/convert/" + "?Amount=" + amountex + "&From=" + curA + "&To=" + curB
        url2 = "http://www.xe.com/currencyconverter/convert/" + "?Amount=" + amountex + "&From=" + curB + "&To=" + curA

        html_code1 = requests.get(url1).text
        html_code2 = requests.get(url2).text

        soup1 = BeautifulSoup(html_code1, 'html.parser')
        soup2 = BeautifulSoup(html_code2, 'html.parser')

        rate1 = soup1.find('span', {'class', 'uccResultAmount'})
        rate2 = soup2.find('span', {'class', 'uccResultAmount'})

        lblfrmex_text.set(rate2.contents[0])
        lbltoex_text.set(rate1.contents[0])
        return lblfrmex_text, lbltoex_text

def results():
    if running:
        cur1 = listbox1.get('active')
        cur2 = listbox2.get('active')

        t = datetime.utcnow()  
        lbldatetime_text.set(t)

#Get cur1/cur2 exrates

        var1 = getrates(cur1, cur2)
        var2 = (var1[0])
        var3 = (var1[0])
        rate1contents = float(var2)
        rate2contents = float(var3)
        print (rate1contents)

我几乎知道我，但我似乎无法看到我哪里出错了？

任何帮助都将不胜感激。