filter out a string

[volcano63]

Thanks for the reply.
I found the second way is better, nice and succinct. And yes it ought to be the same format. Hopefully the cpu temp never reaches temp=123.4 'C :}
In the first method match.group(), some how python complains that in <module>
match.group()
AttributeError: 'NoneType' object has no attribute 'group'

Probably, occasionally you get a string with an integer temp value - changing RE to r'\d+(\.\d+)?' will solve that. (and you will be protected even against 123.4 'C )

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PS I would suggest using subprocess.check_output instead of subprocess.popen.readline(). Of course, in that case RE method is preferred.