问为什么瓶子不能显示本地图像？

EN

# -*- coding:  utf-8 -*-
import bottle
import pandas as pd
from matplotlib import pyplot as plt
import numpy as np
from scipy import optimize as opt


def generate(code, year,week):
    kion = pd.read_csv(r'D:/a.csv')
    kion.head()
    Px = np.arange(0, len(kion), 1)
    Py = kion['temp']
    plt.plot(Px, Py)
    res = opt.curve_fit(fit_func, Px, Py)
    a = res[0][0]
    b = res[0][1]
    c = res[0][2]
    d = res[0][3]
    print("a = %s" % a)
    print("b = %s" % b)
    print("c = %s" % c)
    print("d = %s" % d)
    Px2 = []
    for x in Px:
        Px2.append(a * x ** 3 + b * x ** 2 + c * x + d)
    plt.plot(Px, Py)
    plt.plot(Px, np.array(Px2))
    plt.savefig('test.jpg')
    bottle.redirect('/show')


def fit_func(x, a, b, c, d):
    return a * x ** 3 + b * x ** 2 + c * x + d


@bottle.route('/show')
def index():
    return '''  <div id="container" style="height: 200px; width:200px">
                <img src="/test.jpg"  alt="error" />
                </div>
            '''


@bottle.route('/index')
def index():
    return ''' <form action="/generate" method="post">
                 enployeeCode: <input name="enployeeCode" type="text" /><br/>
                 reportYear: <input name="reportYear" type="text" /><br/>
                 reportWeek: <input name="reportWeek" type="text" /><br/>
                 <input value="generate" type="submit">
               </form>
            '''


@bottle.route('/generate', method='POST')
def get_para():
    enployeeCode = bottle.request.POST.get('enployeeCode')
    reportYear = bottle.request.POST.get('reportYear')
    reportWeek = bottle.request.POST.get('reportWeek')
    if enployeeCode and reportYear and reportWeek:
        generate(enployeeCode, reportYear,reportWeek)

bottle.run(host='localhost', port=8081)

<img src="E://test//test.jpg"  alt="error" />