具有三重嵌套字典的机器人框架变量类文件不可访问点符号 [英] Robot Framework Variable Class File with triple Nested Dictionary is not dot notation accessible

问题描述

使用关于变量文件的机器人框架文档作为指南我使用 get_variables<实现了一个变量文件类/a>.基本示例按描述工作.

Using the Robot Framework Documentation on Variable Files as a guide I implemented a Variable File Class with the get_variables. The basic example works as described.

当我实现三重嵌套字典 (${ABC}) 时，我可以使用 ${A} 和 ${AB}<访问前两个/code> 符号.但是，当我想访问第三个节点 ${A.B.C} 时，结果是我收到错误

When I implement a triple nested Dictionary (${A.B.C}) I can access the first two using ${A} and ${A.B} notation. However, when I want to access the third node ${A.B.C} the result is that I get an error

Resolving variable '${A.B.C}' failed: AttributeError: 'OrderedDict' object
has no attribute 'C'

在下面的三个示例中，我有一个 RF 生成的嵌套字典，我可以通过点符号访问所有节点.第二个例子是一个由变量类返回的普通 Python 字典.在最后一个示例中，返回的 Variable 类的类型为 OrderedDict.

In the below three examples I have an RF generated nested dictionary that I can access all nodes through the dot notation. The second example is a plain Python dictionary that is given back by the Variable Class. In the last example the Variable class returned is of the type OrderedDict.

虽然 ${A['B']['C']['key']} 有效，但在代码中更难阅读.当我加载一个类似的 yaml 结构时，它完全支持点表示法，但这不是一个选项，因为 yaml 文件是静态的，而且我需要 Python 的一些关键值的灵活性.

Although the ${A['B']['C']['key']} works, it is more difficult to read in the code. When I load a similar yaml structure it supports the dot notation fully but this is not an option as the yaml file is static, and I require flexibility of Python for some of the key values.

因此，我正在寻找有关如何返回允许 Robot Framework 使用点符号解释完整嵌套结构的数据结构的支持.

So, I'm looking for some support on how to return a data structure that allows Robot Framework to interpret the full nested structure with the dot notation.

变量类文件

from collections import OrderedDict

class OrderDict(object):
    def get_variables(self):
        C = OrderedDict([(u'key', u'value')])
        B = OrderedDict([(u'C', C)])
        A = OrderedDict([(u'B', B)])
        D = {
                u'E':
                    {
                    u'F':
                        {
                            u'key':  u'value'
                        }
                    }
            }
        return OrderedDict([(u'DICT__A', A), (u'DICT__D', D)])

机器人框架脚本

*** Test Cases ***
Dictionary RF
    ${Z}    Create Dictionary    key=value
    ${Y}    Create Dictionary    Z=${Z}
    ${X}    Create Dictionary    Y=${Y}
    Log To Console    ${EMPTY}
    Log To Console    ${X}
    Log To Console    ${X['Y']['Z']['key']}
    Log To Console    ${X.Y}
    Log To Console    ${X.Y.Z}
    Log To Console    ${X.Y.Z.key}

Plain Dictionary Variable Class
    Log To Console    ${EMPTY}
    Log To Console    ${D}
    Log To Console    ${D['E']['F']['key']}
    Log To Console    ${D.E}
    Log To Console    ${D.E.F}
    Log To Console    ${D.E.F.key}

Ordered Dictionary Variable Class
    Log To Console    ${EMPTY}
    Log To Console    ${A}
    Log To Console    ${A['B']['C']['key']}
    Log To Console    ${A.B}
    Log To Console    ${A.B.C}
    Log To Console    ${A.B.C.key}

机器人框架控制台日志

套件执行器:Robot Framework 3.0.2(Win32 上的 Python 2.7.9)

Suite Executor: Robot Framework 3.0.2 (Python 2.7.9 on win32)

Dictionary RF                                                         
{u'Y': {u'Z': {u'key': u'value'}}}
value
{u'Z': {u'key': u'value'}}
{u'key': u'value'}
value
| PASS |
------------------------------------------------------------------------------
Plain Dictionary Variable Class                                       
{u'E': {u'F': {u'key': u'value'}}}
value
{u'F': {u'key': u'value'}}
| FAIL |
Resolving variable '${D.E.F}' failed: AttributeError: 'dict' object has no attribute 'F'
------------------------------------------------------------------------------
Ordered Dictionary Variable Class                                     
{u'B': OrderedDict([(u'C', OrderedDict([(u'key', u'value')]))])}
value
OrderedDict([(u'C', OrderedDict([(u'key', u'value')]))])
| FAIL |
Resolving variable '${A.B.C}' failed: AttributeError: 'OrderedDict' object has no 
attribute 'C'

推荐答案

在 Robot Framework Slack频道 Pekka Klarck指出Robot Framework内部使用了robot.utils.DotDic类.让 get_variables() 返回一个 DotDic 结构解决了我的问题，我现在可以使用点表示法.下面是变量类 DotDic 的代码(存储为 DotDic.py).

In the Robot Framework Slack channel Pekka Klarck pointed out that Robot Framework internally uses the robot.utils.DotDic class. Having get_variables() return a DotDic structure resolved my issue and I can now use the dot notation. Below is the code for the Variable Class DotDic (stored as DotDic.py).

from robot.utils import DotDict

class DotDic(object):
    def get_variables(self):
        G = {
                u'H':
                    {
                    u'I':
                        {
                            u'key':  u'value'
                        }
                    }
            }
        return {u'G': self.dict_to_dotdict(G)}

    def dict_to_dotdict(self, dct):
        dd = DotDict({})
        for key, val in dct.items():
            if isinstance(val, dict):
                dd[key] = self.dict_to_dotdict(val)
            else:
                dd[key] = val
        return dd

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