Python 127.0.0.1和localhost错误-first REST API，MacOS

我正在学习python，正在编写REST API代码：

from flask import Flask,jsonify,request,render_template

app = Flask(__name__)

stores = [{
    'name': 'My Store',
    'items': [{'name':'my item', 'price': 15.99 }]
}]

@app.route('/')
def home():
    return render_template('index.html')

#post /store data: {name :}
@app.route('/store' , methods=['POST'])
def create_store():
    request_data = request.get_json()
    new_store = {
      'name':request_data['name'],
      'items':[]
    }
    stores.append(new_store)
    return jsonify(new_store)
    #pass

#get /store/<name> data: {name :}
@app.route('/store/<string:name>')
def get_store(name):
    for store in stores:
        if store['name'] == name:
            return jsonify(store)
    return jsonify ({'message': 'store not found'})
    #pass

#get /store
@app.route('/store')
def get_stores():
    return  jsonify(stores)
    #pass

#post /store/<name> data: {name :}
@app.route('/store/<string:name>/item' , methods=['POST'])
def create_item_in_store(name):
    request_data = request.get_json()
    for store in stores:
        if store['name'] == name:
            new_item = {
                'name': request_data['name'],
                'price': request_data['price']
             }
            store['items'].append(new_item)
            return jsonify(new_item)
    return jsonify ({'message' :'store not found'})
    #pass

#get /store/<name>/item data: {name :}
@app.route('/store/<string:name>/item')
def get_item_in_store(name):
    for store in stores:
        if store['name'] == name:
            return jsonify( {'items':store['items'] } )
    return jsonify ({'message':'store not found'})

    #pass

app.run(port=5000)

---

我使用macOS Sierra

这应该是第一件要调查的事情：

jinja2.exceptions.TemplateNotFound:index.html

它正在寻找

index.html

模板文件。是你创造的吗？它是否在正确的位置（即：）我将文件放在名为template的文件夹中。我已经改为模板，它的工作。谢谢你，伙计

[2017-07-17 06:54:35,234] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "app2.py", line 12, in home
    return render_template('index.html')
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/templating.py", line 133, in render_template
    return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list),
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/jinja2/environment.py", line 869, in get_or_select_template
    return self.get_template(template_name_or_list, parent, globals)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/jinja2/environment.py", line 830, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/jinja2/environment.py", line 804, in _load_template
    template = self.loader.load(self, name, globals)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/jinja2/loaders.py", line 113, in load
    source, filename, uptodate = self.get_source(environment, name)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/templating.py", line 57, in get_source
    return self._get_source_fast(environment, template)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/templating.py", line 85, in _get_source_fast
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html
127.0.0.1 - - [17/Jul/2017 06:54:35] "GET / HTTP/1.1" 500 -
127.0.0.1 - - [17/Jul/2017 06:54:35] "GET /favicon.ico HTTP/1.1" 404 -