python - 如何安装 WTForms？尝试导入表单时出现导入错误

Question

我正在尝试关注 Flask Mega Tutorial为此我需要使用 WTForms。正如教程中所建议的，我使用了一个 virtualenv，我在其中安装了 WTForms，如下所示:

flask/bin/pip install flask-wtf

这似乎工作正常，当我现在再次运行它时，我只是得到了这个:

Requirement already satisfied (use --upgrade to upgrade): flask-wtf in ./flask/lib/python2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): Flask in ./flask/lib/python2.7/site-packages (from flask-wtf)
Requirement already satisfied (use --upgrade to upgrade): WTForms>=1.0 in ./flask/lib/python2.7/site-packages (from flask-wtf)
Requirement already satisfied (use --upgrade to upgrade): Werkzeug>=0.7 in ./flask/lib/python2.7/site-packages (from Flask->flask-wtf)
Requirement already satisfied (use --upgrade to upgrade): Jinja2>=2.4 in ./flask/lib/python2.7/site-packages (from Flask->flask-wtf)
Requirement already satisfied (use --upgrade to upgrade): itsdangerous>=0.21 in ./flask/lib/python2.7/site-packages (from Flask->flask-wtf)
Requirement already satisfied (use --upgrade to upgrade): markupsafe in ./flask/lib/python2.7/site-packages (from Jinja2>=2.4->Flask->flask-wtf)
Cleaning up...

但是当我尝试使用 from forms import LoginForm 导入表单时，我收到一条错误消息:ImportError: cannot import name LoginForm。

有谁知道我在这里做错了什么，我该如何解决这个问题？欢迎所有提示!

Answer 1

您需要一个名为 forms 的模块，其中包含 LoginForm，

from flask.ext.wtf import Form
from wtforms import TextField, BooleanField
from wtforms.validators import Required

class LoginForm(Form):
    openid = TextField('openid', validators = [Required()])
    remember_me = BooleanField('remember_me', default = False)

这是取自 Part iii 的示例.