How to use a regexp here

[Neil Cerutti]

On 2017-12-04, Cecil Westerhof <Cecil at decebal.nl> wrote:
> Joel Goldstick <joel.goldstick at gmail.com> writes:
>
>> On Mon, Dec 4, 2017 at 5:21 AM, Ned Batchelder <ned at nedbatchelder.com>
>> wrote:
>>
>>> On 12/4/17 4:36 AM, Cecil Westerhof wrote:
>>>
>>>> I have a script that was running perfectly for some time. It uses:
>>>>      array = [elem for elem in output if 'CPU_TEMP' in elem]
>>>>
>>>> But because output has changed, I have to check for CPU_TEMP at the
>>>> beginning of the line. What would be the best way to implement this?
>>>>
>>>>
>>> No need for a regex just yet:
>>>
>>>     array = [elem for elem in output if elem.startswith('CPU_TEMP')]
>>>
>>> (btw, note that the result of this expression is a list, not an array, for
>>> future Googling.)
>>>
>>> --Ned.
>>> --
>>> https://mail.python.org/mailman/listinfo/python-list
>>>
>>
>> I like Ned's clear answer, but I'm wondering why the original code would
>> fail because the substring is at the start of the line, since 'in' would
>> still be true no matter where the desired string is placed.  It would be
>> useful to see some sample data of the old data, and the new data
>
> There is now also a line that starts with:
>     PCH_CPU_TEMP:
>
> And I do not want that one.

You'll probably want to include the ':' in the startswith check,
in case someday they also add CPU_TEMP_SOMETHING:.

-- 
Neil Cerutti