increment a variable

[Cha malo]

Hi,
I've found some result on google about my problem, but none of them solved my issue. I'm trying to count the number of occurence of 5 item (1 2 3 4 5) in a list:
   ${num0} =    Convert To Number    0
    ${num1} =    Convert To Number    0
    ${num2} =    Convert To Number    0
    ${num3} =    Convert To Number    0
    ${num4} =    Convert To Number    0
    ${num5} =    Convert To Number    0
    :FOR    ${index}    IN RANGE    0    ${vcanum}
    \    ${num0} =    Evaluate    ${num0} + 1
    \    ${num1} =    Run Keyword If    @{elementtext}[${index}] == 1    Evaluate    ${num1} + 1
    \    ${num2} =    Run Keyword If    @{elementtext}[${index}] == 2    Evaluate    ${num2} + 1
    \    ${num3} =    Run Keyword If    @{elementtext}[${index}] == 3    Evaluate    ${num3} + 1
    \    ${num4} =    Run Keyword If    @{elementtext}[${index}] == 4    Evaluate    ${num4} + 1
    \    ${num5} =    Run Keyword If    @{elementtext}[${index}] == 5    Evaluate    ${num5} + 1

 \    ${num0} =    Evaluate    ${num0} + 1: this line is incremented every time.

But the others, i've an error:
Evaluating expression 'None + 1' failed: TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'

[Tatu Aalto]

Ugh

I would assume that for loop works for the first iteration, but it fails on the second iteration. This is because in the first iteration, the number in the ${num*} variables is set to None when the expression in Run Keyword If keyword evaluates as false. When the expression is evaluated as False the Run Keyword If doesn't have anything to return because Evaluate keyword is not run and therefore None is saved to the ${num*} variables.

There is way to solve your problem in the example by using Set Variable If[1] keyword. But perhaps we could find a better solution to your problem if you could explain what is the problem you are trying to solve.

-Tatu
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[1] http://robotframework.org/robotframework/latest/libraries/BuiltIn.html#Set%20Variable%20If

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