为什么即使Python关键字已经修改了字典，我在Robot中也没有修改过的字典？

HKN 发表于 Dev

HKN

这是我的机器人文件（robot-dictionary-tests.robot）

*** Settings ***
Documentation  Passing a dictionary object from Robot to Python and vice versa
Library        Utils.py

# To run:
# robot -L debug -d Results/  Tests/robot-dictionary-tests.robot


*** Keywords ***
Call Python To Modify The Dictionary
[arguments]  &{named}
modify dictionary   ${named}

*** Test Cases ***
Test Modifying Robot Dictionary in Python
    &{d} =          Create Dictionary       key=original
    &{expected} =   Create Dictionary       key=modified
    Call Python To Modify The Dictionary    &{d}
    Should Be Equal   ${d}      ${expected}

这是我的Utils.py：

from robot.api import logger

@keyword('modify dictionary')
def modify_dictionary(d):
   logger.debug(f'before modification, d: {d}')
   for key in d:
       d[key] = 'modified'
   logger.debug(f'after modification, d: {d}')

Python中的测试用例测试修改机器人字典失败：

我的问题

即使我将字典d引用传递给@keyword（'modify dictionary'），为何机器人测试仍会失败？

考特斯特拉

正如您所怀疑的那样，变量是通过引用进行更改的。据我所知，这更多与Python有关，而与Robot Framework有关。

将字典作为对象传递应该通过$ {VarName}而不是＆{VarName}完成。关于字典变量的文档解释如下：

... Python字典或类似字典的对象可用作＆{EXAMPLE}之类的字典变量。实际上，这意味着将字典中的各个项目作为命名参数传递给关键字

在下面的代码关键字Call Python To Modify The Dictionary更改关键字参数&{named}来${named}而且关键字被调用&{d}到${d}。

*** Keywords ***
Call Python To Modify The Dictionary
    [arguments]  ${named}
    modify dictionary   ${named}

*** Test Cases ***
Test Modifying Robot Dictionary in Python
    &{d} =          Create Dictionary       key=original
    &{expected} =   Create Dictionary       key=modified
    Call Python To Modify The Dictionary    ${d}
    Should Be Equal   ${d}      ${expected}

导致：

Suite Executor: Robot Framework 3.1.2 (Python 3.7.0 on win32)
==============================================================================
SO003                                                                         
==============================================================================
SO003.Test :: Passing a dictionary object from Robot to Python and vice versa 
==============================================================================
Test Modifying Robot Dictionary in Python                             | PASS |
------------------------------------------------------------------------------
SO003.Test :: Passing a dictionary object from Robot to Python and... | PASS |
1 critical test, 1 passed, 0 failed
1 test total, 1 passed, 0 failed
==============================================================================
SO003                                                                 | PASS |
1 critical test, 1 passed, 0 failed
1 test total, 1 passed, 0 failed
==============================================================================

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