Google-cloud-python: Storage: TypeError in `storage.Client()`

[Medical-Tribune-DevOpsTeam]

Hello.
I have been confronted with `TypeError' in trying 'storage.Client()' on Google App Engine (Python3.7 standard environment).

The cord was like this:

import flask
from google.cloud import storage
app = flask.Flask(__name__)

@app.route('/storage_test', method = ['POST'])
def storage_test():
    client = storage.Client()

I pushed this app with gcloud app deploy command, and send post request to the proper URL.
Then, I faced the following error:

TypeError: __init__() takes 2 positional arguments but 3 were given
at __init__ (/env/lib/python3.7/site-packages/google/cloud/storage/_http.py:35)
at __init__ (/env/lib/python3.7/site-packages/google/cloud/storage/client.py:110)
at storage_test (/srv/main.py:7)

Though I tried to downgrade to google-cloud-storage==1.18.0, it didn't work either.

I would appreciate it if you give us some reply.

[Medical-Tribune-DevOpsTeam]

My requirements.txt is like this:

Flask==1.1.1
Werkzeug==0.15.5
google-cloud-storage==1.19.0

[tseaver]

You have an out-of-date version of google-cloud-core installed somehow. google-cloud-storage 1.19.0 requires google-cloud-core >= 1.0.3, while google-cloud-storage 1.18.0 requires google-cloud-core >= 1.0.0.

The Python3 AppEngine docs recommend using pip freeze in your local virtual environment to generate requirements.txt, which suggests to me that the installation process doesn't actually resolve dependencies.