>
>  db = DAL(lazy_tables=True) 
>
>
not sure, if lazy_tables = True is mandatory or not, another example for 
on_define :
e.g.
def on_define_bank(table): 
    # default
    table.name.default = ''
    table.age.default = 30
    # label
    table.name.label = T('Name')
    table.age.label = T('Age')
    # notnull
    table.name.notnull = True
    table.age.notnull = True
    # required
    table.name.required = True
    table.age.required = True
    # requires
    table.name.requires = IS_NOT_EMPTY()
    table.age.requires = IS_INT_IN_RANGE(0, 120)

db.define_table('person', 
    Field('name'), 
    Field('age', 'integer'), 
    on_define = on_define_bank)

best regards,
stifan

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