On 29Jan2019 15:44, Jamesie Pic <jpic@yourlabs.org> wrote:
On Fri, Jan 4, 2019 at 10:07 PM Bernardo Sulzbach <bernardo@bernardosulzbach.com> wrote:
I'd suggest violating PEP-8 instead of trying to change it.
TBH even my bash global environment variables tend to become more and more lowercase ...
If you mean _exported_ variables, then this is actually a really bad idea. The shell (sh, bash, ksh etc) makes no enforcement about naming for exported vs unexported variables. And the exported namespace ($PATH etc) is totally open ended, because any programme might expect arbitrary optional exported names for easy tuning of defaults. So, you think, since I only use variables I intend and only export variables I plan to, I can do what I like. Example script: a=1 b=2 export b So $b is now exported to subcommands, but not $a. However: the "exported set" is initially the environment you inherit. Which means: Any variable that _arrives_ in the environment is _already_ in the exported set. So, another script: a=1 b=2 # not exporting either If that gets called from the environment where you'd exported $b (eg from the first script, which could easily be your ~/.profile or ~/.bashrc), then $b gets _modified_ and _exported_ to subcommands, even though you hadn't asked. Because it came in initially from the environment. This means that you don't directly control what is local to the script and what is exported (and thus can affect other scripts). The _only_ way to maintain sanity is the existing convention: local script variables use lowercase names and exported variables use UPPERCASE names. With that in hand, and cooperation from everyone else, you have predictable and reliable behaviour. And you have a nice visual distinction in your code because you know immediately (by convention) whether a variable is exported or not. By exporting lowercase variables you violate this convention, and make your script environment unsafe for others to use. Do many many example scripts on the web do the reverse: using UPPERCASE names for local script variables? Yes they do, and they do a disservice to everyone. Cheers, Cameron Simpson <cs@cskk.id.au>