使用Flask在Python中打开csv文件

我有什么想法我做错了吗？

我的Python代码/ Flash路由如下：

@app.route("/admin",methods=["GET","POST"])
@login_required
def admin():
    """Configure Admin Screen"""
    # if user reached route via POST (as by submitting a form via POST)
    if request.method == "POST":

        # load csv file with portfolio data
        with open(request.files["portfolios"]) as csvfile:
            portfolios = csv.DictReader(csvfile)

        # load csv file in dictionary
        for row in portfolios:
            print(row['first_name'],row['last_name'])
    else:
        return render_template("admin.html")

我的html / Flask代码是：

{% extends "layout.html" %}

{% block title %}
    Admin
{% endblock %}

{% block main %}
<h2>Admin Console</h2>
<h3> Upload Portfolio Data</h2>
<form action="{{ url_for('admin') }}" method="post" enctype=multipart/form-data>
    <fieldset>
        <label class="control-label">Select Portfolio Upload File</label>
        <input id="input-1" type="file" class="file" name="portfolios">
        <h3>Upload Security Lists</h2>
        <label class="control-label">Select Security Upload File</label>
        <input id="input-1" type="file" class="file" name="securities">
        <div class="form-group">
            <button class="btn btn-default" type="submit" value = "upload">Upload</button>
        </div>
    </fieldset>
</form>
{% endblock %}