RF--evaluate关键字

evaluate后面的参数为condition，和should be true一样，详情请看rf--基础中的should be true

evaluate作用为执行后面的python表达式赋值给前者

${var}    set variable    ${890}

完全可以写成

${var}    evaluate    890

复杂的表达式：

*** Test Cases ***
case1
    ${alist}   evaluate    ['hello']*3
    log to console   ${alist}
结果：
['hello', 'hello', 'hello']

*** Test Cases ***
case2
    ${alist}   evaluate    [i for i in range(10)]
    log to console   ${alist}
结果：
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

*** Test Cases ***
case3
    ${alist}   evaluate    [i for i in range(10)]
    ${alist}    evaluate  $alist[:5]    #evaluate作用为执行后面的python表达式，后面的参数类似should be true
    log to console   ${alist}
结果：
[0, 1, 2, 3, 4]

evaluate后面不能带 =

*** Test Cases ***
case4
    ${alist}   evaluate    [i for i in range(10)]
    ${alist}    evaluate  $alist[0]=9    #evaluate后的参数类似should be true
    log to console   ${alist}
结果报错：
Evaluating expression 'RF_VAR_alist [0 ]=9' failed: SyntaxError: invalid syntax (<string>, line 1)