For循环给出所有列表而不是机器人框架中的一个项目

Question

我有这个代码：

Test Check For Loop
    @{ret_val} =    Read Data From Excel    ${filename}      ${sheetname}
    log to console      ${ret_val}
    :FOR    ${item}     IN      ${ret_val}
    \   log to console      ${item}

Read Data From Excel 是我开发的其他关键字之一，效果很好；但我得到了这个输出：

Test Check For Loop                                           [{'key1': 'val1', 'key2': 'val2'}]
[{'key1': 'val1', 'key2': 'val2'}]
| PASS |
------------------------------------------------------------------------------
Scenario.scenario                                                     | PASS |
0 critical tests, 0 passed, 0 failed
1 test total, 1 passed, 0 failed
==============================================================================
Scenario                                                              | PASS |
0 critical tests, 0 passed, 0 failed
1 test total, 1 passed, 0 failed
==============================================================================

如您所见，${item} 与 ${ret_val} 完全相同。我正在遍历列表， ${item} 应该是列表中存在的项目之一，这意味着它应该是一本字典。所以第二个打印应该是：

{'key1': 'val1', 'key2': 'val2'}

知道为什么框架不迭代 returns 整个列表而不是项目吗？

编辑 1：

我已经按照@Laurent Bristiel的回答解决了这个问题。我应该如下编写列表变量：

:FOR    ${item}     IN      @{ret_val}

Answer 1

您的代码有几个问题

1) 对变量执行 FOR 时，使用 @{variable} 而不是 $(variable) 参见 doc about loop in Robot User Guide。

2) 你循环的数组是一个只有一个元素的数组（字典）所以你只会得到一个元素（字典）也许您想遍历索引的项目、值或键。请参阅 Collections documentation。这是一个循环遍历字典所有项目的示例。

*** Settings ***
Library  Collections

*** Test Cases ***
Test Check For Loop
    # @{ret_val} =    Read Data From Excel    ${filename}      ${sheetname}
    # this creates something like: [{'key1': 'val1', 'key2': 'val2'}]
    # let's mock this keyword and build the dict of array ourselves
    ${dict} =  create dictionary  key1  val1  key2  val2
    @{ret_val} =  create list  ${dict}

    log to console  ${\n}Object we want to parse: ${ret_val}
    # This shows: [{u'key2': u'val2', u'key1': u'val1'}]
    # which is an array with only 1 element, which is a dict

    :FOR  ${item}  IN  @{ret_val}
    \   log to console  Parsing with FOR over the array: ${item}
    # whith this you get your only element

    ${dict} =  get from list  ${ret_val}  0
    ${items} =  Get Dictionary Items  ${dict}
    log to console  Parsing with FOR over the dict content
    :FOR  ${item}  IN  @{items}
    \   log to console  Item: ${item}

这是输出：

$ pybot for.robot
==============================================================================
For
==============================================================================
Test Check For Loop                                                   
Object we want to parse: [{u'key2': u'val2', u'key1': u'val1'}]
Parsing with FOR over the array: {u'key2': u'val2', u'key1': u'val1'}
Parsing with FOR over the dict content
Item: key1
Item: val1
Item: key2
Item: val2
Test Check For Loop                                                   | PASS |
------------------------------------------------------------------------------
For                                                                   | PASS |
1 critical test, 1 passed, 0 failed
1 test total, 1 passed, 0 failed
==============================================================================

For循环给出所有列表而不是机器人框架中的一个项目

For loop gives all the list instead of one item in robot framework

for-loop

robotframework