我无法使用 Flask、MongoDB 和 Python 让一个简单的 Hello World 应用程序工作。尝试从 bson
模块导入时,应用程序正在轰炸。所有模块都通过 pip
成功安装,并且我在 virtualenv
中运行,所以我不确定为什么会出现错误:ImportError: cannot导入名称 BSON
这是我的示例应用代码:
import os
from flask import Flask
from flask import g
from flask import jsonify
from flask import json
from flask import request
from flask import url_for
from flask import redirect
from flask import render_template
from flask import make_response
import pymongo
from pymongo import Connection
from bson import BSON
from bson import json_util
app = Flask(__name__)
@app.route('/')
def hello():
connection = Connection()
# Get your DB
db = connection.my_database
# Get your collection
cars = db.cars
# Create some objects
import datetime
car = {"brand": "Ford",
"model": "Mustang",
"date": datetime.datetime.utcnow()}
# Insert it
cars.insert(car)
json_docs = [json.dumps(doc, default=json_util.default) for doc in cars.find()]
return json_docs
if __name__ == '__main__':
# Bind to PORT if defined, otherwise default to 5000.
port = int(os.environ.get('PORT', 5000))
app.debug = True
app.run(host='0.0.0.0', port=port)
我不确定如何进行调试,或者这里是否缺少某些东西。
编辑:pip freeze
的结果:
Flask==0.9
Jinja2==2.6
WTForms==1.0.2
Werkzeug==0.8.3
bson==0.3.3
distribute==0.6.28
mongo==0.2.0
pymongo==2.3
pytz==2012g
wsgiref==0.1.2
Edit2:删除 bson 和 pymongo,重新运行 pip install pymongo
。现在完成跟踪:
Traceback (most recent call last):
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
18:21:20 web.1 | return self.wsgi_app(environ, start_response)
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
18:21:20 web.1 | response = self.make_response(self.handle_exception(e))
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
18:21:20 web.1 | response = self.full_dispatch_request()
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/flask/app.py", line 1361, in full_dispatch_request
18:21:20 web.1 | response = self.make_response(rv)
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/flask/app.py", line 1450, in make_response
18:21:20 web.1 | rv = self.response_class.force_type(rv, request.environ)
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/werkzeug/wrappers.py", line 711, in force_type
18:21:20 web.1 | response = BaseResponse(*_run_wsgi_app(response, environ))
18:21:20 web.1 | File ".../venv/lib/python2.7/site-packages/werkzeug/test.py", line 818, in run_wsgi_app
18:21:20 web.1 | app_iter = app(environ, start_response)
18:21:20 web.1 | TypeError: 'list' object is not callable
最佳答案
尝试卸载 bson
和 pymongo
包,然后重新安装 pymongo
包。 pymongo
安装自己的 bson
包,我认为你已经用其他 bson
包安装覆盖了它,这可能是导致你导入的原因错误。
仅供引用:
- 当您 pip install pymongo 时,它也会安装 bson,但它不会打印一条消息说它正在将 bson 安装到您的 virtualenv 站点包中
- pymongo 也没有将 bson 列为 dep
- pip -v list 也没有显示 bson 已安装
- IMO 的那些要点有一些代码味道(至少打印一条消息,说明您正在安装 bson)
关于python - import pymongo 导致 `ImportError: cannot import name BSON` 。你如何修复导入错误?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12983472/