Question

我有这个python程序：

import yaml
import pprint

class DictProductCart(object):

    def __init__(self, dicta, dictb):
        self.dicta = dicta
        self.dictb = dictb

    def __repr__(self):
        result = str()
        chaine=str()
        for clea,valeura in iter(sorted(self.dicta.iteritems())):
            chaine = "%s: %s,\n" % (clea,self.dictb)
            result = result + chaine
        return result

yaml_str= """\
!!python/object:__main__.DictProductCart
dicta: {a: 1, b: 2}
dictb: {i: 10, j: 20}
"""
testdata = yaml.load(yaml_str)
pp = pprint.PrettyPrinter(indent=2)
pp.pprint(testdata)

结果正常：

a: {'i': 10, 'j': 20},
b: {'i': 10, 'j': 20},

现在，我将yaml数据存储在一个文件中：

!!python/object:__main__.DictProductCart
dicta: {a: 1, b: 2}
dictb: {i: 10, j: 20}

但是当我运行程序时，出现此错误：

yaml.constructor.ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:python/object:mod_dictproductcart.DictProductCart'
  in "toto.yaml", line 1, column 1

你有个主意吗？

Answer 1

在python3中使用：for clea,valeura in iter(sorted(self.dicta.items())):代替

for clea,valeura in iter(sorted(self.dicta.iteritems())):

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