[Python-ideas] String interpolation: environment variables, command substitution

[Brendan Barnwell]

On 2015-08-26 12:53, Mike Miller wrote:
> We've already acquiesced to arbitrary expressions, so this is a small further
> step, icing on the cake, no?  I believe Guido mentioned something about
> "half-measures" in one of his messages.

	There's no comparison between "arbitrary expressions" and "new syntax 
for shell shortcuts".  "Arbitrary expressions" are arbitrary Python 
expressions, so that just means being able to do what you can already do 
in Python, with Python syntax, in Python strings.  This includes being 
able to access environment variables, since you can already do that with 
a Python expression.  These shell shortcuts are just a way to open a 
back door that would bring all of shell syntax into Python, and add new 
complications to Python's own syntax as well.  I see quick-and-dirty 
shell scripting as pretty small potatoes in the scheme of things Python 
can be used for; it's not worth changing the language in any significant 
way to a accommodate that.

-- 
Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is no 
path, and leave a trail."
    --author unknown