I am brand new to web2py and know a little python, so I am a definite 
novice. I am trying to build a purchasing agent app and am getting result 
"0" from function cost3. I am expecting to get a sum of the values for a 
specified job number (in cost2) in table PO Field mycost when I specify a 
job number in function cost2.. but I am not getting a sum of those numbers 
but am getting 0 instead. Any help would be appreciated, thanks.

db

db.define_table('jobinfo',
    Field('jobnumber', 'integer', requires=IS_NOT_EMPTY()),
    Field('jobname', 'string', requires=IS_NOT_EMPTY()),
    Field('jobbudget', 'double'),
    format = '%(jobnumber)s')

db.define_table('vendortype',
    Field('vtype', 'string', requires=IS_NOT_EMPTY()),
    format = '%(vtype)s')

db.define_table('vendorr',
    Field('company_name',requires=IS_NOT_EMPTY()),
    Field('address1',requires=IS_NOT_EMPTY()),
    Field('address2'),
    Field('city',requires=IS_NOT_EMPTY()),
    Field('co_state',requires=IS_NOT_EMPTY()),
    Field('zip',requires=IS_NOT_EMPTY()),
    Field('vendor_type', db.vendortype),
    Field('terms'),
    format = '%(company_name)s')

db.define_table('POreq',
    Field('job_id', db.jobinfo, requires=IS_NOT_EMPTY()),
    Field('Vendor_id', db.vendorr, requires=IS_NOT_EMPTY()),
    Field('Qty_1'),
    Field('Description_1'),
    Field('Notes_1'),
    Field('RequiredBy_1','date'),
    format = '%(Vendor_id)s')

db.define_table('PO',
    Field('job_id', db.jobinfo ),
    Field('vname',db.vendorr),
    Field('Qty_1', 'double'),
    Field('Description_1'),
    Field('Notes_1'),
    Field('RequiredBy_1','date'),
    Field('mycost', 'double'),
    format = '%(job_id)s')

controller

def cost2():
    form=FORM('Job Number: ',
        INPUT(_name='jobnumber', requires=IS_INT_IN_RANGE(0,9000)),
        INPUT(_type='submit')).process()
    if form.accepted:
        redirect(URL('cost3',args=form.vars.jobnumber))
    return dict(form=form)

def cost3():
    jnum = request.args(0,cast=int)
    a = 0
    for row in db(db.PO.job_id==jnum).select():
        a = a + row.mycost
    return a

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