I recently got this problem in Linux Debian, after upgrading web2py, fixed 
with

$sudo pip install pydal -U



On Saturday, February 24, 2018 at 3:03:05 AM UTC-3, jim kaubisch wrote:
>
> Thanks for the reply, Dave.
>
> There have been a number of issues surrounding the last couple of versions 
> of Mac OS which come down to the fact that Apple has tightened security of 
> the core of the system, As a result of that, some third party code doesn't 
> always run because its trying to do things that it probably should never 
> have been able to do, and that are no longer permitted - I was tearing my 
> hair out the last couple of days trying to update my version of pyinstaller 
> with pip failing no matter what I did because the system would not allow it 
> to delete old files that it expected to be able to :(
>
> The problem here may ultimately be tied up with this general issue. I will 
> keep poking at it. It seems I'm the only one who has the problem :(
>
> Jim
>
> On Thursday, February 15, 2018 at 2:05:26 AM UTC-8, Dave S wrote:
>>
>> On Wednesday, February 14, 2018 at 6:23:44 PM UTC-8, jim kaubisch wrote:
>>>
>>> Has no-one else had this problem?
>>>
>>
>> I run web2py on Windows or on linux, and having multiple versions has not 
>> been a problem.  That's the way I usually upgrade, copying my applications 
>> across, and looking for js/css/appadmin changes.   Lets me switch back 
>> easily, and I'm not running anywhere that the size of web2py makes for a 
>> problem.
>>
>> I don't often use a Mac, so I don't know how that environment changes 
>> things, other than some of the key labels.
>>
>> /dps
>>  
>>
>>>
>>>
>>> On Wednesday, February 7, 2018 at 10:47:19 AM UTC-8, jim kaubisch wrote:
>>>>
>>>> Hi,
>>>>
>>>> I needed to directed my attention away from my web2py project a few 
>>>> months ago but am now trying to get back into it. 
>>>> A wise Step 1 would seem to be to update from 2.14.6 to the current 
>>>> version (2.16.1 I assume).
>>>>
>>>> First tried from source but got 
>>>>
>>>> Traceback (most recent call last):
>>>>
>>>>   File "web2py.py", line 21, in <module>
>>>>
>>>>     import gluon.widget
>>>>
>>>>   File “./Development/web2py/gluon/__init__.py", line 38, in <module>
>>>>
>>>>     from .dal import DAL, Field
>>>>
>>>>   File “./Development/web2py/gluon/dal.py", line 17, in <module>
>>>>
>>>>     from pydal.migrator import Migrator, InDBMigrator
>>>>
>>>> ImportError: cannot import name InDBMigrator
>>>>
>>>>
>>>> I still have 2.14.6 installed (in a separate sub-tree) - is that the 
>>>> problem?
>>>>
>>>>
>>>> so I downloaded the mac "mac_osx.zip" to try that but - 
>>>>
>>>> after unzipping, when I try to run the resulting web2py/web2py.app I 
>>>> just get a pop up saying "web2py error". 
>>>>
>>>> When I look at the file info for the web2py.app file it says Version 
>>>> 2.4.7, dated 29 May, 2013
>>>>
>>>>
>>>> What am I doing wrong? 
>>>>
>>>> The app file info certainly doesn't look encouraging. 
>>>>
>>>> I assume having 2 versions of web2py in separate sub-trees shouldn't be 
>>>> a problem
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> Jim
>>>>
>>>>
>>>>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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