python - NameError：未定义全局名称“is_sequence”

Question

我在degree_day(osv.osv)类中创建了函数is_sequence(arg )

当我从write函数调用此函数时，系统会生成错误：

NameError：未定义全局名称“is_sequence”

我不明白为什么系统没有找到这个功能。

Client Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\http.py", line 204, in dispatch
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\controllers\main.py", line 1130, in call_kw
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\controllers\main.py", line 1122, in _call_kw
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\session.py", line 42, in proxy
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\session.py", line 30, in proxy_method
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\session.py", line 103, in send


Server Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\web\session.py", line 89, in send
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\.\openerp\netsvc.py", line 292, in dispatch_rpc
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\.\openerp\service\web_services.py", line 626, in dispatch
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\.\openerp\osv\osv.py", line 188, in execute_kw
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\.\openerp\osv\osv.py", line 131, in wrapper
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\.\openerp\osv\osv.py", line 197, in execute
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\.\openerp\osv\osv.py", line 185, in execute_cr
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\degree_day\degree_day.py", line 187, in correct_future_degree_day
  File "C:\Program Files (x86)\OpenERP 7.0-20130520-231036\Server\server\openerp\addons\degree_day\degree_day.py", line 79, in write
NameError: global name 'is_sequence' is not defined

degree_day.py

from openerp.osv import osv, fields
from dateutil.parser import *
from dateutil.tz import *
from datetime import *


class degree_day(osv.osv):

    _name = "degree.day"
    _order = "date"
    _columns={
        'date': fields.date('Date'),
        'high_temp': fields.integer('High Temp'),
        'low_temp': fields.integer('Low Temp'),
        'heat_degree_day': fields.integer('Heat Degree Day' ),
        'hw_degree_day': fields.integer('Hot Water Degree Day' ),
        'state': fields.selection([
            ('normal','Normal'),
            ('initial_dd_adjust','Adjust Initial Degree Day')
            ], 'Status', readonly=True, track_visibility='onchange',
            help=' * The \'Normal\' status is used when a user is entering high and low temps and degree day values are readonly \
            \n* The \'Adjust Initial Degree Day\' status is used when a user is manually adjusting the first degree day records degree day values.'),
        'debug':fields.text('Debug text'),
        'initial_dd_record': fields.boolean("First DD Record"),
    }

    _defaults = {
        'state': lambda *a: 'normal',
    }

    def is_sequence(arg):
            return (not hasattr(arg, "strip") and
                hasattr(arg, "__getitem__") or
                hasattr(arg, "__iter__"))

    def write(self, cr, uid, ids, vals, context=None):
        debug = '... '
        dd_recs = self.pool.get('degree.day')

        # were degree.day records retrieved?
        if dd_recs:
            debug += " dd_recs not null:" 

            # initial dd recs have dd values entered manually 
            # since there is no Day Before to draw from
            init_dd_rec = dd_recs.read(cr, uid, ids, ["initial_dd_record"])
            debug += "initial_dd_record="+str(init_dd_rec)+":"

            # sometimes this comes thorugh as a list and sometimes as single
            # convert to single if list
            if is_sequence(init_dd_rec):
                one_init_dd_rec = init_dd_rec[0]
            else:
                one_init_dd_rec = init_dd_rec

            # skip readonly override code if initial_dd_record is true
            # as all fields are readonly=False in this case
            if not one_init_dd_rec:
                debug += " not initial dd rec:" 

                # if high_temp not present, add it
                if not vals.has_key('high_temp'):
                    debug += " no high_temp:"
                    vals['high_temp'] = dd_recs.read(cr, uid, ids, ["high_temp"])[0]['high_temp']

                # if low_temp not present, add it
                if not vals.has_key('low_temp'):
                    debug += " no low_temp:"
                    vals['low_temp'] = dd_recs.read(cr, uid, ids, ["low_temp"])[0]['low_temp']

                vals['date'] = dd_recs.read(cr, uid, ids, ["date"])[0]['date']
                debug += " vals['date']="+vals['date']+":"
                debug += " dd_recs.read(cr, uid, ids, ['date'])=" +str(dd_recs.read(cr, uid, ids, ['date']))+":"

                # date seems to be stored as a string, so need to convert it before 
                # using it to find yesterdays date
                adate = parse(vals['date'])
                day_before = adate - timedelta(days=1)
                db_ids = dd_recs.search(cr, uid, [("date", "=", day_before)])

                # is there a record for yesterday?
                if db_ids:
                    debug += " ids not null:"
                    last_hdd = dd_recs.read(cr, uid, db_ids[0], ['heat_degree_day'])['heat_degree_day']
                    debug += " last_hdd="+str(last_hdd)+":"
                    last_hwdd = dd_recs.read(cr, uid, db_ids[0], ['hw_degree_day'])['hw_degree_day']
                    high_temp = vals['high_temp']
                    low_temp = vals['low_temp']
                    a = 65 - ((high_temp + low_temp)/2)
                    if a < 0:
                        a = 0
                    vals['heat_degree_day'] = a + last_hdd
                    vals['hw_degree_day'] = a + 5 + last_hwdd

        vals['debug'] = debug

        return super(degree_day, self).write(cr, uid, ids, vals, context=context)



    def create(self, cr, uid, vals, context=None):
        debug = '... '
        if vals.has_key('high_temp') and vals.has_key('low_temp'):
            adate = parse(vals['date'])
            day_before = adate - timedelta(days=1)
            dd_recs = self.pool.get('degree.day')
            # were any degree.day records retrieved?
            if dd_recs:
                debug += " dd_recs not null:" 
                ids = dd_recs.search(cr, uid, [("date", "=", day_before)])
                # is there a record for yesterday?
                if ids:
                    debug += " ids not null:"
                    last_hdd = dd_recs.read(cr, uid, ids[0], ["heat_degree_day"])
                    last_hwdd = dd_recs.read(cr, uid, ids[0], ["hw_degree_day"])
                    high_temp = vals['high_temp']
                    low_temp = vals['low_temp']
                    a = 65 - ((high_temp + low_temp)/2)
                    if a < 0:
                        a = 0
                    vals['heat_degree_day'] = a + last_hdd['heat_degree_day']
                    vals['hw_degree_day'] = a + 5 + last_hwdd['hw_degree_day']

        vals['debug'] = debug
        return super(degree_day, self).create(cr, uid, vals, context=context)



    def correct_future_degree_day(self, cr, uid, ids, heat_degree_day, hw_degree_day, date, debug, context=None):
        """ when a degree days record is changed, all following records must be corrected
        @param high_temp: The day's high temperature
        @param low_temp: The day's low temperature
        """
        v={}
        debug = "... "

        dd_recs = self.pool.get('degree.day')
        if dd_recs:
            debug += " dd_recs not null:" 
            ids = dd_recs.search(cr, uid, [("date", ">=", date)], 0, None, "date")
            # are there records after this date?
            if ids:
                debug += " future records found:"
                running_hdd = heat_degree_day
                running_hwdd = hw_degree_day
                # cycle through each record recalculating degree day values
                for i in ids:
                    debug += "loop " + str(i) + ":"
                    low_temp = dd_recs.read(cr, uid, i, ["low_temp"])["low_temp"]
                    high_temp = dd_recs.read(cr, uid, i, ["high_temp"])["high_temp"]
                    # degree day calculation
                    a = 65 - ((high_temp + low_temp)/2)
                    if a < 0:
                        debug += " a<0:"
                        a = 0
                    running_hdd += a
                    running_hwdd += a + 5
                    update_dd = {"heat_degree_day":running_hdd, "hw_degree_day":running_hwdd}
                    dd_recs.write(cr, uid, i, update_dd, context=None)
                    debug += " done:"

        v['debug'] = debug
        return {'value':v}

degree_day_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="degree_day_tree" model="ir.ui.view">
            <field name="name">degree.day.tree</field>
            <field name="priority" eval="1"/>           
            <field name="model">degree.day</field>
             <field name="arch" type="xml">
                <tree string="Degree Day List">
                    <field name="date"  />
                    <field name="high_temp" />
                    <field name="low_temp" />
                    <field name="heat_degree_day"  /> 
                    <field name="hw_degree_day" />
                    <field name="state" invisible="True" />
                    <field name="debug" />
                </tree>
            </field>
        </record>

        <record id="degree_day_form" model="ir.ui.view">
            <field name="name">degree.day.form</field>
            <field name="model">degree.day</field>
            <field name="priority" eval="2"/>           
            <field name="arch" type="xml">
                <form string="Degree Day" version="7.0">
                    <sheet string="Degree Day">
                        <h1>Day <field name="date" class="oe_inline"/></h1>
                        <group>
                            <field name="low_temp" readonly="False"/>
                            <field name="high_temp" readonly="False"/>
                        </group>
                        <group>
                            <field name="heat_degree_day" attrs="{'readonly': [('initial_dd_record','=',False)]}" on_change="correct_future_degree_day(heat_degree_day, hw_degree_day, date, debug)"/>
                            <field name="hw_degree_day" attrs="{'readonly': [('initial_dd_record','=',False)]}" on_change="correct_future_degree_day(heat_degree_day, hw_degree_day, date, debug)" />
                        </group>
                        <group>
                            <field name="initial_dd_record" />
                        </group>
                        <field name="state" invisible="True" />
                        <field name="debug" />
                    </sheet>
                </form>
            </field>
        </record>

        <record id="show_degree_day" model="ir.actions.act_window">
            <field name="name">Degree Day</field>
            <field name="view_id" ref="degree_day_tree" />
            <field name="res_model">degree.day</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
        </record>

        <menuitem id="degree_day_menu" name="Degree Day"/>
        <menuitem id="degree_day_main_menu" parent="degree_day_menu" name="Degree Day Menu" />

        <menuitem name="Degree Day List" id="menu_degree_day_list"  
            parent="degree_day_main_menu" action="show_degree_day"/>


    </data>

</openerp>

Answer 1

调用is_sequence(..)as self.is_sequence(..)，并 make is_sequenceas 静态方法。

或者

做is_sequence一个函数。（下课）。

Answer 2

如果您在调用函数时未将其绑定到 degree_day 类的实例，则需要使用 degree_day.is_sequence 调用它，并将 degree_day 的实例作为第一个参数传递给函数。

但是，将函数的范围限制在类中而不使其成为实例方法或静态方法并没有多大意义。如果您需要将其设为静态方法，请使用“@staticmethod”进行装饰。如果您需要它作为实例方法，请通过将 self 作为第一个参数传递来像下面的其他方法一样定义它。

所以这两个选项是
1) 静态方法

@staticmethod
def is_sequence(arg):
    ...

2) 实例方法

def is_sequence(self, arg):
    ...

在第一种情况下，您可以使用 degree_day.is_sequence 调用它。在第二种情况下，由于您是从另一个方法中调用的，您可以使用 self.is_sequence 调用它。