[Tutor] A simpler mousetrap

[Liam Clarke]

Hi all, 

I'm writing some code, and I want to take a given path + filename, and
change the file extension to *.bak.

In doing so, (entirely internal this function), I am assuming -

That the file will always have an extension
Thathe extension will vary
But, it will follow the general DOS format of name.ext

So, I came up with this -

a="./tc/arc/gab.pct"

x=a.replace(a[a.rfind('.'):len(a)],'.bak')

x="./tc/arc/gab.bak"

So, it works, but it feels a bit, well, hacky to me. Not nearly hacky
as using an regex though ; )

I thought about 

a="./tc/arc/gab.pct"

aList=a.split('.')
aList[-1]='bak'
a=".".join(aList)

but I'm wondering if there's a simpler way, as there usually seems to
be, and it's always so obvious once I'm shown it, like 6 down - Six on
vehicle live in the manse (VI + car). Obvious once you know.

Regards,

Liam Clarke
-- 
'There is only one basic human right, and that is to do as you damn well please.
And with it comes the only basic human duty, to take the consequences.