从google.cloud导入firestore ModuleNotFoundError：没有名为“ google”的模块

Question

我无法让我的应用程序从Google Firestore中读取文档。

这是我的python Flask main.py

from flask import Flask
from google.cloud import firestore

app = Flask(__name__)
db = firestore.Client()

@app.route('/')
def hello():
    posts_ref = db.collections(u'posts')
    posts = posts_ref.get()
    for post in posts:
        return u'{} => {}'.format(post.id, post.to_dict())


if __name__ == '__main__':
    app.run(host='127.0.0.1', port=8080, debug=True)

但是日志显示以下错误。

2019-02-22 12:33:08 default[2-9]  "GET / HTTP/1.1" 502
2019-02-22 12:33:10 default[2-9]  [2019-02-22 12:33:10 +0000] [8] [INFO] Starting gunicorn 19.9.0
2019-02-22 12:33:10 default[2-9]  [2019-02-22 12:33:10 +0000] [8] [INFO] Listening at: http://0.0.0.0:8081 (8)
2019-02-22 12:33:10 default[2-9]  [2019-02-22 12:33:10 +0000] [8] [INFO] Using worker: threads
2019-02-22 12:33:10 default[2-9]  [2019-02-22 12:33:10 +0000] [23] [INFO] Booting worker with pid: 23
2019-02-22 12:33:10 default[2-9]  [2019-02-22 12:33:10 +0000] [23] [ERROR] Exception in worker process
2019-02-22 12:33:10 default[2-9]  Traceback (most recent call last):    File "/env/lib/python3.7/site-packages/gunicorn/arbiter.py",l
ine 583, in spawn_worker      worker.init_process()    File "/env/lib/python3.7/site-packages/gunicorn/workers/gthread.py", line 104,
 in init_process      super(ThreadWorker, self).init_process()    File "/env/lib/python3.7/site-packages/gunicorn/workers/base.py",li
ne 129, in init_process      self.load_wsgi()    File "/env/lib/python3.7/site-packages/gunicorn/workers/base.py", line 138, in load_
wsgi      self.wsgi = self.app.wsgi()    File "/env/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi      self.cal
lable = self.load()    File "/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load      return self.load_wsgiap
p()    File "/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp      return util.import_app(self.app
_uri)    File "/env/lib/python3.7/site-packages/gunicorn/util.py", line 350, in import_app      __import__(module)    File "/srv/main
.py", line 2, in <module>      from google.cloud import firestore  ModuleNotFoundError: No module named 'google'
2019-02-22 12:33:10 default[2-9]  [2019-02-22 12:33:10 +0000] [23] [INFO] Worker exiting (pid: 23)
2019-02-22 12:33:11 default[2-9]  [2019-02-22 12:33:11 +0000] [8] [INFO] Shutting down: Master

我的目录结构

我在lib文件夹和google文件夹中都有 init .py。

Answer 1

正如ustin-ingram @所建议的那样，很可能您没有正确导入google.cloud.firestore（可能还有flask）软件包。

一个好的做法是创建一个virtualenv，先创建一个requirements.txt，然后创建一个pip install -r requirements.txt。其内容可能是：

flask==1.0.2
google-cloud-firestore==0.31.0

您的代码中也有错字；是collection而不是collections：

posts_ref = db.collection(u'posts')

您将需要在项目中启用Firestore（并且还可能在运行代码之前创建posts集合）。