[Python-ideas] Non-intrusive debug logging

[Joseph Jevnik]

This can be accomplished as a decorator. Jim Crist wrote a version of this using
the codetransformer library. The usage is pretty simple:


@trace()
def sum_word_lengths(words):
    total = 0
    for w in words:
        word_length = len(w)
        total += word_length
    return total


>>> sum_word_lengths(['apple', 'banana', 'pear', 'orange'])
total = 0
w = 'apple'
word_length = 5
total = 5
w = 'banana'
word_length = 6
total = 11
w = 'pear'
word_length = 4
total = 15
w = 'orange'
word_length = 6
total = 21

21


The source for the trace decorator is in this available here:
https://gist.github.com/jcrist/2b97c9bcc0b95caa73ce (I can't figure out how to
link to a section, it is under "Tracing").

On Thu, Jan 25, 2018 at 4:03 PM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Steve Barnes wrote:
>>
>> I would suggest, however, that if this feature is introduced it be
>> controlled via a run-time switch &/or environment variable which defaults to
>> off.
>
>
> I disagreew with defaulting it to off. That would encourage
> lazy developers to distribute library code full of #l lines,
> so that when you turn it on to debug something of your own,
> you get swamped with someone else's debugging messages.
>
> --
> Greg
>
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