While trying to connect google cloud sql from appengine-web2py it is giving 
following error:

RuntimeError: Failure to connect, tried 5 times: Traceback (most recent 
call last): File 
"/base/data/home/apps/s~eappair-201601/20170131t082737.398849371354660874/gluon/packages/dal/pydal/base.py"
, line 446, in __init__ self._adapter = ADAPTERS[self._dbname](**kwargs) 
File 
"/base/data/home/apps/s~eappair-201601/20170131t082737.398849371354660874/gluon/packages/dal/pydal/adapters/base.py"
, line 60, in __call__ obj = super(AdapterMeta, cls).__call__(*args, **
kwargs) File 
"/base/data/home/apps/s~eappair-201601/20170131t082737.398849371354660874/gluon/packages/dal/pydal/adapters/mysql.py"
, line 96, in __init__ if do_connect: self.find_driver(adapter_args,uri) 
File 
"/base/data/home/apps/s~eappair-201601/20170131t082737.398849371354660874/gluon/packages/dal/pydal/adapters/base.py"
, line 192, in find_driver raise RuntimeError("no driver available %s" % str
(self.drivers)) RuntimeError: no driver available ('MySQLdb', 'pymysql', 
'mysqlconnector')

   1. 
      1. at __init__ (/base/data/home/apps/s~eappair-201601/
      20170131t082737.398849371354660874/gluon/packages/dal/pydal/base.py:
      473 
      
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20170206t051219&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~eappair-201601%2F20170131t082737.398849371354660874%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fbase.py&line=473&project=eappair-201601>
      )
      2. at __call__ (/base/data/home/apps/s~eappair-201601/
      20170131t082737.398849371354660874/gluon/packages/dal/pydal/base.py:
      174 
      
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20170206t051219&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~eappair-201601%2F20170131t082737.398849371354660874%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fbase.py&line=174&project=eappair-201601>
      )
      3. at <module> (/base/data/home/apps/s~eappair-201601/
      20170131t082737.398849371354660874/applications/skf/models/common_cid.
      py:6 
      
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20170206t051219&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~eappair-201601%2F20170131t082737.398849371354660874%2Fapplications%2Fskf%2Fmodels%2Fcommon_cid.py&line=6&project=eappair-201601>
      )
      4. at restricted (/base/data/home/apps/s~eappair-201601/
      20170131t082737.398849371354660874/gluon/restricted.py:227 
      
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20170206t051219&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~eappair-201601%2F20170131t082737.398849371354660874%2Fgluon%2Frestricted.py&line=227&project=eappair-201601>
      )
   

I have installed pip install mysql-python

Added following line to - app.yaml 

env_variables:
    CLOUDSQL_CONNECTION_NAME: 
myproject-201601:us-central1:sqlabc-004-uscentral
    CLOUDSQL_USER: root
    CLOUDSQL_PASSWORD: cloudsqlpass
    
libraries:
- name: MySQLdb
  version: "latest" 

My connection string look like this:

db = DAL('google:sql://myproject-201601:us-central1:sqlabc-004-uscentral
/testdb')


Thanks,
Akand


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