[web2py] Hope someone knows the answer to this one {was:....web2py math?}

[Bill Thayer]

So the same code above is now throwing an error and when I even visit 
http://127.0.0.1:8000/PROD/default/index. I know I don't feel right using 
request variable in my model file so I changed

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Traceback (most recent call last):
  File "C:\web2py_src_2.2.1\web2py\gluon\restricted.py", line 212, in restricted
    exec ccode in environment
  File "C:/web2py_src_2.2.1/web2py/applications/PROD/models/db_wizard.py" 
<http://127.0.0.1:8000/admin/default/edit/PROD/models/db_wizard.py>, line 105, 
in <module>
    db.loadpull.points.requires=loadpull_points_in_range(request.vars.pstop, 
request.vars.pstart)
  File "C:/web2py_src_2.2.1/web2py/applications/PROD/models/db_wizard.py" 
<http://127.0.0.1:8000/admin/default/edit/PROD/models/db_wizard.py>, line 59, 
in loadpull_points_in_range
    (int(Decimal(pstop)-Decimal(pstart))*10000),
  File "C:\Python27\lib\decimal.py", line 658, in __new__
    raise TypeError("Cannot convert %r to Decimal" % value)
TypeError: Cannot convert None to Decimal


I don't feel right about using the request variable anyway so I changed 
this line:


db.loadpull.points.requires=lambda row: loadpull_points_in_range(row.pstop, 
row.pstart)

And get <type 'exceptions.AttributeError'> 'str' object has no attribute 
'pstop'

File "C:\web2py_src_2.2.1\web2py\gluon\html.py", line 1743, in _validate
    (value, errors) = validator(value)
  File "C:/web2py_src_2.2.1/web2py/applications/PROD/models/db_wizard.py" 
<http://127.0.0.1:8000/admin/default/edit/PROD/models/db_wizard.py>, line 105, 
in <lambda>
    db.loadpull.points.requires=lambda row: loadpull_points_in_range(row.pstop, 
row.pstart)
AttributeError: 'str' object has no attribute 'pstop'



db.loadpull.points.requires=lambda row: loadpull_points_in_range(
'%(row.pstop)s', '%(row.pstart)')
Is not right either 
<class 'decimal.InvalidOperation'> Invalid literal for Decimal: 
'%(row.pstop)s'

I really don't know what happened when my original code worked (math error 
aside) when request.vars but now it won't even run.

I have been reading up on lambda functions too since I went through another 
round of not having the correct number of arguments.



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