我想向django-oscar添加送货方式,但即使我已经完成了文档页面上的所有内容,我也收到了UnboundLocalError错误。
Request Method: GET
Request URL: http://127.0.0.1:8000/checkout/shipping-address/
Django Version: 2.1.7
Exception Type: UnboundLocalError
Exception Value:
local variable 'methods' referenced before assignment
repository.朋友
from oscar.apps.shipping import repository
from . import methods
class Repository(repository.Repository):
def get_available_shipping_methods(self, basket, user=None, shipping_addr=None, request=None, **kwargs):
methods = (methods.Standard(),)
if shipping_addr and shipping_addr.country.code == 'GB':
# Express is only available in the UK
methods = (methods.Standard(), methods.Express())
return methods
methods.朋友
from oscar.apps.shipping import methods
from oscar.core import prices
from decimal import Decimal as D
class Standard(methods.Base):
code = 'standard'
name = 'Shipping (Standard)'
def calculate(self, basket):
return prices.Price(
currency=basket.currency,
excl_tax=D('5.00'), incl_tax=D('5.00'))
class Express(methods.Base):
code = 'express'
name = 'Shipping (Express)'
def calculate(self, basket):
return prices.Price(
currency=basket.currency,
excl_tax=D('4.00'), incl_tax=D('4.00'))
我可以看到这是在文档中,但他们看起来有一个错误。
使用UnboundLocalError
,您基本上是在查看范围问题。一个非常简单的例子是;
x = 10
def foo():
x += 1
print x
foo()
当foo
执行x时,foo
无法使用。所以稍微改变进口以避免这种情况;
from oscar.apps.shipping import repository
from . import methods as shipping_methods
class Repository(repository.Repository):
def get_available_shipping_methods(self, basket, user=None, shipping_addr=None, request=None, **kwargs):
methods = (shipping_methods.Standard(),)
if shipping_addr and shipping_addr.country.code == 'GB':
# Express is only available in the UK
methods = (shipping_methods.Standard(), shipping_methods.Express())
return methods