C.D. Reimer wrote:
^^^^
Who?
> Noobie
What?
> question regarding a single line of code that transforms a URL
> slug ("this-is-a-slug") into a title ("This Is A Slug").
>
> title = slug.replace('-',' ').title()
>
> This line also works if I switched the dot operators around.
>
> title = slug.title().replace('-',' ')
>
> I'm reading the first example as character replacement first and title
> capitalization second, and the second example as title capitalization
> first and character replacement second.
You are reading correctly.
> Does python perform the dot operators from left to right or according to
> a rule of order (i.e., multiplication/division before add/subtract)?
Yes. If you debug the code, which you should have done before posting [1] ,
you will see that
'this-is-a-slug'.title() == 'This-Is-A-Slug'
It follows that in this special case it does not matter if you call .title()
before or after .replace().
However, for greater efficiency, in general you should call .replace() in
such a way that the length of the string it operates on is minimized. For
example, if feasible, always slice *before* .replace().
[1] <http://www.catb.org/~esr/faqs/smart-questions.html>
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