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[已解决]Flask开发期间在python交互命令行中导入User失败:ImportError cannot import name User

Flask crifan 1813浏览 0评论

参考一堆资料去折腾Flask开发

Quickstart — Flask-SQLAlchemy Documentation (2.1)

去Python的交互式环境中,执行导入app没问题:

(SIPEvents) ➜  SIPEvents python
Python 2.7.12 (default, Aug 15 2016, 11:09:04) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from sipevents import db

<div–<——————————————————————————

DEBUG in __init__ [sipevents/__init__.py:14]:
db=<SQLAlchemy engine=’sqlite:////usr/share/nginx/html/SIPEvents/instance/sipevents.db’>

<div–<——————————————————————————

但是再去导入models中的User失败:

>>> from sipevents import User
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name User

对应的代码是:

/Users/crifan/dev/dev_root/daryun/SIPEvents/sourcecode/flask/sipevents/models.py

from sipevents import app
from . import db
# from app import db
class User(db.Model):
    __tablename__ = ‘wechat_users’
    # Columns
    openid = db.Column(db.String(64), primary_key=True)

对于代码:

/Users/crifan/dev/dev_root/daryun/SIPEvents/sourcecode/flask/sipevents/__init__.py

#!/usr/bin/python
# -*- coding: UTF-8 -*-
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__, instance_relative_config=True)
app.config.from_object(‘config’) # load config.py
app.config.from_pyfile(‘config.py’)
app.debug = app.config["FLASK_DEBUG"]
db = SQLAlchemy(app)
app.logger.debug("db=%s", db)
from sipevents import views, models

也去试了试其它的的,但是都不行:

>>> from sipevents import models
>>> from sipevents import models.User
  File "<stdin>", line 1
    from sipevents import models.User
                                ^
SyntaxError: invalid syntax
>>> from models import User
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named models
>>> import models.User
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named models.User

Flask  SQLAlchemy ImportError: cannot import name User

python – ImportError when importing from a lower module – Stack Overflow

Python, Flask, SQLAlchemy: cannot import from models – Stack Overflow

Flask: circular import problem

后来去:

/Users/crifan/dev/dev_root/daryun/SIPEvents/sourcecode/flask/sipevents/__init__.py

中,多加了导入User:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__, instance_relative_config=True)
app.config.from_object(‘config’) # load config.py
app.config.from_pyfile(‘config.py’)
app.debug = app.config["FLASK_DEBUG"]
db = SQLAlchemy(app)
app.logger.debug("db=%s", db)
from sipevents import views, models
from models import  User

就可以了:

(SIPEvents) ➜  SIPEvents python
Python 2.7.12 (default, Aug 15 2016, 11:09:04) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from sipevents import db

<div–<——————————————————————————

DEBUG in __init__ [sipevents/__init__.py:14]:
db=<SQLAlchemy engine=’sqlite:////usr/share/nginx/html/SIPEvents/instance/sipevents.db’>

<div–<——————————————————————————

>>> from sipevents imo^Hp
  File "<stdin>", line 1
    from sipevents imp
                     ^
SyntaxError: invalid syntax
>>> from sipevents import User
>>> crifanUserJson = {
…   "province": u"江苏",
…   "openid": "oswjmv4X0cCXcfkIwjoDfCkeTVVY",
…   "headimgurl": "http://wx.qlogo.cn/mmopen/ajNVdqHZLLDYtIJicNl7MjwZK5c1lxAJZ253c9v3JzDib7GeE5OFrWiaRqsK1ruW1HmGaziaYETV5vQhIIbic6wHKFQ/0",
…   "language": u"zh_CN",
…   "city": u"苏州",
…   "country": u"中国",
…   "sex": 1,
…   "privilege": [],
…   "nickname": u"礼貌"
… }
>>> app.logger.debug(‘crifanUserJson=%s’, crifanUserJson)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name ‘app’ is not defined
>>> from sipevents import app
>>> app.logger.debug(‘crifanUserJson=%s’, crifanUserJson)

<div–<——————————————————————————

DEBUG in <stdin> [<stdin>:1]:
crifanUserJson={‘province’: u’\u6c5f\u82cf’, ‘openid’: ‘oswjmv4X0cCXcfkIwjoDfCkeTVVY’, ‘headimgurl’: ‘http://wx.qlogo.cn/mmopen/ajNVdqHZLLDYtIJicNl7MjwZK5c1lxAJZ253c9v3JzDib7GeE5OFrWiaRqsK1ruW1HmGaziaYETV5vQhIIbic6wHKFQ/0’, ‘language’: u’zh_CN’, ‘city’: u’\u82cf\u5dde’, ‘privilege’: [], ‘country’: u’\u4e2d\u56fd’, ‘nickname’: u’\u793c\u8c8c’, ‘sex’: 1}

<div–<——————————————————————————

>>> 
>>> crifanUser = User(openid = crifanUserJson[‘openid’],
…                   province = crifanUserJson[‘province’],
…                   headimgurl = crifanUserJson[‘headimgurl’],
…                   language = crifanUserJson[‘language’],
…                   city = crifanUserJson[‘city’],
…                   country = crifanUserJson[‘country’],
…                   sex = crifanUserJson[‘sex’],
…                   nickname = crifanUserJson[‘nickname’])
>>> app.logger.debug(‘crifanUser=%s’, crifanUser)

<div–<——————————————————————————

DEBUG in <stdin> [<stdin>:1]:
crifanUser=<User u’\u793c\u8c8c’ oswjmv4X0cCXcfkIwjoDfCkeTVVY>

<div–<——————————————————————————

>>> db.create_all()
>>> db.session.add(crifanUser)
>>> db.session.commit()
>>> currentUsers = User.query.all()
>>> app.logger.debug(‘currentUsers=%s’, currentUsers)

<div–<——————————————————————————

DEBUG in <stdin> [<stdin>:1]:
currentUsers=[<User u’\u793c\u8c8c’ oswjmv4X0cCXcfkIwjoDfCkeTVVY>]

<div–<——————————————————————————

>>>

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