robotframework - Return results in Robot Framework keyword?

Question

How can I return the results after running a keyword?

Example:

mykey word [Arguments] input
   ${results}=  getme input

But I want to use these results:

 ${results} = mykey word  newinput

Answer 1

Robot Framework 用户指南描述了如何从关键字返回值。请参阅用户关键字返回值。

简短的版本是：在关键字中设置一个变量，并使用[return]testcase 设置返回该变量。

这是一个例子：

*** Keywords ***
mykey word
  [Arguments]  ${input}
  ${string}=  set variable  the string is "${input}"
  [return]  ${string}

*** Test Cases ***
Call custom keyword and get result
  ${results}=  mykey word  newinput
  Should be equal    ${results}    the string is "newinput"

Robot 还提供了几个关键字来显式地从关键字中的任何位置返回值：

• 从关键字返回
• 从关键字返回 if
• 运行关键字并返回
• 运行关键字并返回 if
• 运行关键字并返回状态

Answer 2

一个简单的例子可能会有所帮助：

*** Keywords ***
Convert temperature F To Centigrade
  [Arguments]  ${ftemp}
  ${ftemp} =  Convert To Float  ${ftemp}
  ${ctemp} =  ${0.9} * ${ftemp} - ${32}
  [Return]  ${ctemp}

Convert temperature C To Fahrenheit
  [Arguments]  ${ctemp}
  ${ctemp} =  Convert To Float  ${ctemp}
  ${ftemp} =  ${1.8} * ${ctemp} + ${32}
  [Return]  ${ftemp}

*** Test Cases ***
Verify Temperature Conversion  
  ${result} =  Convert temperature F To Centigrade  ${32}
  Should Be Equal  ${result}  ${0}
  ${result} =  Convert temperature C To Fahrenheit  ${0}
  Should Be Equal  ${result}  ${32}

Answer 3

使用 [Return] 返回结果。

一个例子是：

Time Stamp

      [Return]  ${time_stamp}
      ${secs}=  Get Time  epoch
      ${time}=  Get Time
      ${time_stamp}=  Convert To String      ${secs}

${time_stamp} 的值将存储在Time Stamp关键字中。

Answer 4

# This example will explain the usage of build in library keywords.
# The "Evaluate", "Log", and "Return" settings by using Fahrenheit to Centigrade
# conversion logic on the variable ${var1}.

*** Variables ***
${var1}     32
*** Keywords ***
Convert temperature Fahrenheit To Centigrade
  [Arguments]  ${ftemp}
  ${ftemp} =  Convert To Number     ${ftemp}
  ${ctemp} =  evaluate  (5 * (${ftemp} - 32))/9
  [Return]  ${ctemp}


*** Test Cases ***
Verify Temperature Conversion F to C
  ${result} =  Convert temperature Fahrenheit To Centigrade  ${var1}
  Log  ${result}
  Should Be Equal As Numbers    ${result}   0.0

Answer 5

最简单的方法是在关键字末尾使用建议的 [Return] 标签，尽管还有其他方法。

使用关键字设置全局变量，您可以使变量在运行它的关键字之外可访问，而不必从关键字本身返回任何内容。如果您想避免弄乱主变量列表并在后台放置一些变量，这很有用，但要像使用任何全局变量一样谨慎使用它。