导入 Flask WTF 表单时出现导入错误

Question

我看不出我哪里错了。我安装了最新的 WTF 表格，但仍然出现此错误。

方法：

from flask.ext.wtf import Form
from wtforms import PasswordField, validators, fields
from wtforms.fields import TextField, BooleanField
from wtforms.validators import Required, Email, EqualTo

结果：

Traceback (most recent call last):

  File "/bin/user_wsgi_wrapper.py", line 67, in __call__
self.error_log_file.logger.exception("Error running WSGI application")
  File "/usr/lib/python3.3/logging/__init__.py", line 1269, in exception
self.error(msg, *args, **kwargs)
  File "/usr/lib/python3.3/logging/__init__.py", line 1262, in error
self._log(ERROR, msg, args, **kwargs)
  File "/usr/lib/python3.3/logging/__init__.py", line 1368, in _log
self.handle(record)
  File "/usr/lib/python3.3/logging/__init__.py", line 1377, in handle
if (not self.disabled) and self.filter(record):
 File "/usr/lib/python3.3/logflask_wtf
wtformsging/__init__.py", line 687, in filter
for f in self.filters:
 File "/bin/user_wsgi_wrapper.py", line 59, in __call__
app_iterator = self.app(environ, start_response)
 File "/bin/user_wsgi_wrapper.py", line 73, in import_error_application
raise e
 File "/bin/user_wsgi_wrapper.py", line 82, in <module>
application = load_wsgi_application()
 File "/bin/user_wsgi_wrapper.py", line 78, in load_wsgi_application
return __import__(os.environ['WSGI_MODULE'], globals(), locals(),     ['application']).application
 File "/var/www/rcham_pythonanywhere_com_wsgi.py", line 16, in <module>
from addressbook.app import app as application
 File "/home/rcham/mysite/addressbook/app.py", line 4, in <module>
from addressbook.forms import LoginForm, ContactsForm
 File "/home/rcham/mysite/addressbook/forms.py", line 1, in <module>
from flask.ext.wtf import Form
 File "/usr/local/lib/python3.3/dist-packages/flask/exthook.py", line 87, in load_module
raise ImportError('No module named %s' % fullname)
ImportError: No module named flask.ext.wtf

ls /home/rcham/.local/lib/python2.7/site-packages/flask

    __init__.py blueprints.py debughelpers.py globals.pyc logging.pyc signals.pyc
    views.py __init__.pyc blueprints.pyc debughelpers.pyc helpers.py module.py 
    templating.py views.pyc _compat.py config.py ext helpers.pyc module.pyc 
    templating.pyc wrappers.py _compat.pyc config.pyc exthook.py json.py 
    sessions.py testing.py wrappers.pyc app.py ctx.py exthook.pyc json.pyc 
    sessions.pyc testing.pyc app.pyc ctx.pyc globals.py logging.py signals.py 
    testsuite


ls /usr/local/lib/python3.3/dist-packages/ | grep wtf

   flask_wtf
   wtforms

Answer 1

根据官方快速入门，

flask.ext.wtf

应该是

flask_wtf

。

所以你必须将其导入为：

from flask_wtf import FlaskForm 

至少我有，我是从 pip 安装的。

Answer 2

请使用

from flask_wtf import Form

from wtforms import TextField, BooleanField,IntegerField
from wtforms.validators import Required

自 v0.8 以来已更改

Answer 3

看起来您只安装了

wtforms

，而不是

Flask-WTF

扩展。

安装

Flask-WTF

：

pip install flask-wtf

Answer 4

看起来 wtf.validators required 从使用Required()方法更改为DataRequired()方法。所以改变：

from wtforms.validators import Required, Email, EqualTo

至：

from wtforms.validators import DataRequired, Email, EqualTo

并将所有对Required()方法的引用修改为DataRequired。

从 WTForms 3.0 开始，所需方法已被弃用 https://wtforms.readthedocs.io/en/2.3.x/_modules/wtforms/validators/