I am trying to calculate the number of days and use that value in another 
calculation in my database.
I used this method below which used to to work perfectly but todays its 
giving me an error 
db.define_table('invoice',
                Field('loaning_date', 'date', label=SPAN('Date Loaned', 
_style="font-weight: bold;"), requires=IS_NOT_EMPTY()),
                Field('returning_date', 'date', label=SPAN('Date Returned', 
_style="font-weight: bold;"), requires=IS_NOT_EMPTY()),
*                              #Number of days calculation*
                *Field('daysLoaned', compute=lambda r: 
(r['returning_date']-r['loaning_date']).days),* 
                Field('price', 'float', label=SPAN('Price', 
_style="font-weight: 
bold;"), requires=IS_MATCH('[0-9]+', error_message=T('Enter Money in Proper 
Figures'))),
                Field('totalPrice', compute=lambda r: float(r['price'])* int
(r['daysLoaned']), label=SPAN('Total Price', _style="font-weight: bold;")))

Why am i getting this error? How do i rectify it, maybe i am missing 
something!

Regards;

Mostwanted

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