LISP Machines

I really wish we had a front-end to software even half as useful as this in the 21st C, but technology has regressed massively since the '80s and '90s. Some of the old IDEs, before they became bloated "enterprise" software (because giant mega-corporations paid for them, not individual programmers, so the IDE makers serve their paymasters), started to slouch towards this kind of usefulness but fast and small. CodeWarrior, Project Builder/Interface Builder, Borland's Turbo Whatever.

emacs isn't the answer, it's an abandonment of the question; "modern" emacs turned away from the LM zmacs model, it's now just a terrible LISP interpreter with a bad text-only-editor front end; you can make tools in it, but nobody sane will want to use them. I'm perfectly comfortable with the emacs editing keys (well, obviously, Macs use emacs keys for all text areas), but the machinery in it is just broken.

I get excited about Chez Scheme having a nice REPL, with history and can edit multi-line blocks in the REPL, unlike the crappy readline almost every other Scheme uses. But it doesn't do hypertext, it doesn't do graphics, it barely has tab completion (procedure names only), it doesn't have any inline documentation & source inspector; all of those were in the LISP Machine.

When I'm working, I have my text editor (BBEdit or Atom mostly), a terminal with the REPL running and I copy-paste to it, 3-4 PDFs open (R6RS, R6RS-lib, CSUG, sometimes TSPL), and a web browser pointed at the SRFIs. If the Internet connection went down, I'd have to search the SRFI sources to figure out what's in there. I really need a better tool for this.

DrRacket can do some graphics inline, and the tab completion shows documentation hints in the top right corner, but as I note every time, it doesn't really have a REPL because it destroys the interactive environment every time you edit code; utterly useless for code exploration. And in practice, Racket is really horrifyingly slow; it does fine in focused benchmarks but real-world use it just falls over drooling.

The graphics part's sort of irrelevant, and sort of not; the way the LISP Machine worked was getting a "presentation" form for an object, which would render as text or drawings or images, and interacting with it sent messages back to that object. That's probably out of scope for anything except a complete new OS and terminal. A simplistic number-tagged hypertext would be good enough and orders of magnitude easier.

So. I'm not sure what to do here, I don't want to just complain about tools and not do anything about them. I could try to extract the docs to make a hypertext doc system; a lot of text processing on TeX source sounds painful, and a one-off job, I want a more universal solution. It may be possible to hook into Chez's completion to call a help system. Or it could be a standalone program that you feed several doc sources into, and it lets you search against them. Dash does that, but it's Mac and C/Objective-C primarily, and does poorly at other docsets.

Programming on Your Phone

Pythonista lets you use your pocket UNIX workstation as a workstation. I use Pythonista, if not every day, very heavily on the days I use it. As always it's crippling of Apple that there's no upgrade pricing, so I can't give him more money every year that I keep using it. The new keyboard module is an interesting script launcher, but I already wrap a bunch of utilities in a main menu program.

There should really be more of these mobile programming environments. In the early days, Apple severely restricted you from shipping one; you could kind of cheat with JavaScript, and a few games snuck in some bytecode interpreters, but scripting was right out. They loosened up eventually, but are still dicks about you saving code anywhere it could be shared, so for example I have to keep my Pythonista stuff in iCloud, not DropBox where it'd make more sense.

  • Panic's Coda and Coda for iOS (née "Code Editor" WTF) is the only other one that's really functional; I've built real web sites out of it, but I mostly use it for ssh. Sweet baby Cthulhu, I hate Panic's crooked-text "designer" sites, I hit Reader view on those instantly. Designers shouldn't be allowed access to CSS or JS.
  • Hotpaw BASIC still works (as does his Chipmunk BASIC on the Mac), but hasn't been updated in 2 years. Not that I want to program in BASIC, but it's better than no programming at all.
  • The iPad used to have a very nice "BASIC!" (with a structured BASIC and a bunch of system functionality), and a very limited "iSkeme" (scheme interpreter, R5RS-ish? with nothing but text I/O), but they were killed in the 64-bit-pocalypse.
  • Workflow (née Apple Shortcuts) is great for putting a few tasks in a row but you'd go insane trying to write anything complex from drag-and-drop clicky boxes.
  • Apple's Swift Playgrounds on iPad is a tutorial, not really usable for applications AIUI.
  • There's a bunch of "kids learn to code!" apps that are mostly ripoffs charging $60/year to play robot tanks. Do not buy anything like this.

I dunno if the 'droids have anything comparable, I'm sure they can root their phone and try to use vi in a busybox shell, but that's not a reasonable work environment for a thumb-sized on-screen keyboard.

SwiftUI, SceneKit, AR, and Facebook's React are the new JavaFX

That is all.

OK, will clarify for those who don't know about JavaFX: It was a new UI metaphor/declarative model on top of Java Swing, which is a giant bloated mess on top of Java AWT, which was a thin, minimally-functional shim on top of native platform UI, usually just CPU-bound drawing in a canvas. It came out just as Java applets became the most common virus vector, and Java on the desktop was dying off (aside from Minecraft, which uses LWJGL). JavaFX was not inherently bad, but limited by its underlying tech stack. Only a few people used it seriously, and their software is now broken because it's EOL by an uncaring corporate owner.

Don't tie yourself to hot marketing garbage APIs pushed by evil mega-corporations.

Programming the Atari 8-bit

My programming started in 1979 with the TRS-80 Model I, but in late 1981? early 1982?, I got my Atari 800, and later a 1200XL, then Atari ST. Those are what I consider "my computers".

Last few weeks for hobby time, I've taken up playing with an Atari 8-bit emulator, and may soon buy an old machine (130XE? I guess?) and a modern SD-card reader, and HDMI adapter unless I want to set up my old CRT… Yes, this is "pointless", but it's the most emotionally rewarding programming I've done in some time.

Had to do a lot of setup to get to this point, though. Follows are my excessive notes, which will hopefully be useful to others.

The keyboard mapping in AtariMacX is weird, I finally figured out:

Mac Key Atari Key
` Break
F2 Option
F3 Select
F4 Start
F5 Reset
Sh-F5 Cold Boot
Opt-F5 Insert Char (be REAL DAMN CAREFUL not to miss the Opt key!)
Home / Opt-F7 Clear
End Atari/Inverse
PgDn / Opt-F10 Help (XL/XE)
Opt-F1 F1 (1200XL)
Opt-F2 F2 (1200XL)
Opt-F3 F3 (1200XL)
Opt-F4 F4 (1200XL)
Capslock Cycle caps, may take several tries of caps A backspace repeat until you get lowercase, not graphics or uppercase.
Sh-Capslock Uppercase, almost always works

Typing on a real Atari keyboard is probably the #1 reason to get real hardware instead of emulation.

Immediately it comes rushing back, how much I didn't like the default environment of blue screen, clicky keyboard, inset margins. Easy to fix with a few pokes, but I don't want to do that every time I reboot, so I need a startup program.

  • First, configure Atari800MacX with the subdirectories next to it. It comes with all these folders in user space, but it's actually mapped to somewhere in /var, which is awful.
  • Make a boot disk. Media -> Disk Image Conversions -> XFD to ATR, pick the DOS25.XFD image in OSRoms, and call that boot.atr, store it in Disks, Load it in D1 Cmd-1 and pick boot.atr.
  • Reboot into DOS, by Control -> Disable BASIC. Bask in the glory of Atari DOS 2.5.
  • Make a data disk, Media -> New Floppy Image, I went with Medium Density (130K) since almost everything can read that, assign to Drive 2, and call that disk2.atr or whatever.
    • From Atari DOS, Format: I <return> D2: <return> Y <return>
    • Preferences -> Boot Media -> Set to Current Media, Save Configuration
  • My Atari BASIC project on Gitlab
    • Based on what I remember of my old main menu, I had a ton more stuff but I'm slowly adding routines as I need them. This can also be a shell for new programs, delete 11-9998 and use the subroutines. I wrote Draw to test joystick & function key scanning, not to be a good paint program, typed in a Music demo to make sure I had sound working.
      • Digression: This is not an efficient structure, because high line numbers take longer to find; an optimizing Poindexter would put the subroutines tightly packed at 1-999 and the program at 1000+, but it's massively easier to read & work with this way. I won't be in BASIC that much anyway, it's just for utility work.
    • Download AUTO.LST, convert Unix newlines (char 10) to the ATASCII newline (char 155 õ), and drop it in the HardDrive1 folder.
    • % LANG=C tr '\233' '\n' <AUTO.LST.TXT >AUTO.LST
    • Or you can just Media -> Edit an .ATR disk image, import file, and that has a newline conversion.
    • From BASIC, E."H1.AUTO.LST" <return> RUN <return>, pick Y. (Script AUTORUN.SYS), and enter:
      • ?"MAINMENU"
      • E."H1:AUTO.LST"
      • RUN
      • .
    • Change H1 to D1 if you saved it in your boot.atr.
    • Now it'll do that on every bootup from that floppy. Reboot to be sure it works.
    • If you make changes to your main menu, remember to LIST "H1:AUTO.LST". I use LIST/ENTER (text LST format) instead of SAVE/LOAD (tokenized BAS format) so I can read it from the Mac; BAS is slightly smaller and much faster to load/save, but it doesn't matter with emulation or an SD-card.

    • Atari-autorunsys

  • BASIC set up and tested, and it's a convenient place for little utilities, but now for real programming.

  • Atari Macro Assembler and Program Text Editor

    • Download this, read the fine manuals; more for MEDIT than the assembler unless you're really hardcore. I will probably do little or no assembly, even tho back in the '80s I could hand-assemble short programs directly into ATASCII codes to run from BASIC; bug-eating freak that I was.
    • Read the MEDIT manual. It's quite a respectable full-screen editor with command mode for search/replace, block editing, etc.
    • Open the Atari Macro Assembler and Program Text Editor.atx (ATX is write-protected or encrypted or something; you can't use them directly, and have to disable the SIO speedup hack in emulator) disk in drive 2 of your Atari (Cmd-2), Control -> Disable BASIC (which will reboot to DOS). So you want the program files off that:
      • DOS: C <return> D2:MEDIT,D1:MEDIT <return>
      • DOS: C <return> D2:MEDITCM.BAS,D1:MEDITCM.BAS <return>
      • DOS: C <return> D2:AMAC,D1:AMAC <return> (skip if you'll never write ASM)
      • DOS: C <return> D2:SYSTEXT,D1:SYSTEXT <return> (I think only needed for AMAC?)
      • Eject: Ctrl-Cmd-2
      • Reload your data disk, Cmd-1, disk2.atr.
    • Control -> Enable BASIC, LOAD "D1:MEDITCM.BAS" <return> RUN <return> and configure MEDIT however you like.
      • Language: PAS
      • Tabstops: Set at 5 and +4 after the existing ones, because 8-wide tabs are crazy in a 40-column screen. Yes, I'm a tabs not spaces guy, OBVIOUSLY.
      • Margins: 1,40
      • Colors: 12,4,14 (sadly can't be 0 or 2 background luminance, because the cursor is black)
      • Flags: Tabs: Expand, Shift-Lock: No (starts in lowercase).
      • Save & Return to DOS.
      • You can just copy the MEDITPAS.ECF to MEDITTXT.ECF, etc., you don't need to run the tool for each language, but it doesn't have a default mode. Note you also have to copy these to each disk you're editing on, or it switches back to the stupid defaults:
      • DOS: C <return> D1:*.ECF,D2: <return>
      • DOS: L <return> MEDIT <return>, filename D2:HELLO.PAS, and enter:
        program hello;
        var c: char;
          writeln('Hello, Atari!');
      • <option> exit <start> to save & exit. Note return doesn't execute commands in MEDIT, start does. Kids Today™ have some meme about how hard it is to exit vi? Ha ha, they have no idea. RTFM.

  • Finally ready to program in Action! or Pascal, which is what I mainly did back in the day.

    • Deep Blue C: Tragically underpowered version of Small-C. I loved it as an intro to C, but didn't use C for real until the Atari ST. It did produce standalone binaries and the compiler was easy to use, IIRC.
        Features in C not supported in DEEP BLUE C are:
        1) structures, unions
        2) multidimension arrays
        3) Floating point numbers
        4) Functions returning anything but int
        5) Unary operators: sizeof
        6) Binary operators: typecasting
        THE DEEP BLUE C language has the  following nonstandard features:
        1. The last clause of a "switch" statement, either "case" or "default", must
      be terminated with a "break", a "continue" or a "return" statement.
        2. The ancient =<op> construct has been removed. Use <op>= instead.
        3. Characters are unsigned. Chars range in value from 0 to 255.
        4. Strings can not be continued on the next logical line.
        5. C source code lines can be a maximum of 79 characters long.
        6. Functions can have a maximum of 126 arguments.
        C uses several ASCII characters not available on the ATARI computer's
      keyboard. In particular the braces have been replaced by to two-letter
      combinations $( and $), and the tilde has been replaced by $-.  The $ character
      is not used in C, so your editor's find and replace command can be used to
      convert standard c programs into a format acceptable to DEEP BLUE C.
    • Action!: Custom language on cart for Atari, fantastic built-in editor (later the basis for the Paperclip word processor!), had a disk runtime system so you could distribute programs (also on AtariMania). But it came out a little later than my Pascal adventures, and it's a weird super-low-level language, and I think I'm in no mood to relearn it right now. Super goddamned fast, tho. May get into this if I'm frustrated later.

    • APX Pascal: Excessively complex process with a disk swap for every compile, compiles & links into PCode, no explanation of how to boot it. This is a very user-hostile compiler.
    • Kyan Pascal: Maze of command line tools. Doesn't work, at least for me, on emulation. It cycles through the tools, but never actually builds anything, eventually crashes and corrupts video. Makes a big deal of being usable from RAMDisk, but that doesn't matter on modern hardware.
    • Draper Pascal: Which I used in the '80s. Hilariously bad editor (but I can use MEDIT, so fuck that), compiler just fucking works, but only produces PCode (.PCD), so has to start from bootdisk or run Draper's menu then your program, ick. But this was no trouble to get running, so it wins.
      • Insert drpascal.atr in drive 1, reboot, boots into a menu.
      • 3 Compile program: D2:HELLO.PAS
      • 1 Run program: D2:HELLO
      • Total success! \o/ Hit any key to exit the program.
      • Drive 1, boot.atr, Drive 2, drpascal.atr, reboot
      • DOS: C <return> D2:AUTORUN.SYS,D1:PASCAL.COM <return>
      • DOS: C <return> D2:INIT.PCD,D1:INIT.PCD <return>
      • Cmd-2, disk2.atr
      • So now I can: DOS: L <return> PASCAL.COM <return>
      • And run Pascal programs. I could make a more focused runtime menu for it, maybe dir & list all the PCD files, the INIT.PAS source is included. If I ask it to compile, it prompts to insert drpascal.atr, and then I can switch back, which is reasonable.
      • Standard library is small but effective, seems like it has all the BASIC equivalent commands, and enough POKE/PEEK/ADDR stuff to let me do everything, including Player-Missile Graphics.
      • I can presumably now move all my source and disk2.atr contents to H1, so they can be managed & edited on the Mac, but I just wanted to get things running first.
      • Probably make another gitlab project (and actually sync it from git) when I get somewhere with that.

This took quite a lot of my hobby time doing something harder than actual work, to be honest. But I'm in a good place with it now.

OS Compatibility and the Web

OK, not EOL yet, but soon. Long before any rational person would switch to an untested, incompatible new OS version. Among other things, anyone using Adobe software can't go to Catalina.

The policy I like is to support the last two or three major OS releases. There are good techniques in Objective-C to support testing for new features and falling back if you don't have them; I don't think most of those work in Swift, because Swift's an amateur hour language.

Happily, I use Feedbin to sync my RSS feeds rather than keep them all local, so when NNW stops updating I can just go back to a working web interface. Sad that Brent keeps resurrecting and killing his app, but that's what he gets for chasing Apple's tail.

This is why the web beats native applications. You can indeed make a better interface in native code; you can't maintain it, and you can't port it. The native dev is constantly chasing a new API that breaks everything past, and fighting with garbage tools like Xcode. The web dev just needs ed or another text editor, and only has to target the browser, which is a moving target but has backfills and a compatibility policy, and native browsers generally work on the last two major OS releases. Firefox is a UI shitshow, but still supports OS X 10.9 Mavericks (2013); Safari obviously is part of the OS, and the last few changes are making me strongly consider moving off it, but this Mojave version will keep browsing the web just fine long after Catalina is released.

The ideal of cross-platform languages ever since UCSD Pascal is to get the best of both worlds, write code once and have it compile and run everywhere, and ignore underlying OS changes.

BBEdit 13

The "Pattern Playground"
Added the Grep Cheat Sheet.

I've been doing regexp for 35 years, and still don't remember every pattern (especially all the ?= stuff). So what chance do normal people have?

BBEdit allows you to make rectangular selections in documents for which "Soft Wrap Text" is turned on.

Woo! I use this all the time in my MultiMarkdown tables (sadly, "Columns" doesn't recognize them) and it was annoying having to switch to hard wrap (where I can't read any paragraphs), wait for it to reflow, edit table, switch back to soft wrap, wait for it to reflow.

The "Deploy Site" command for configured web projects will now:
Generate and upload HTML for Markdown (and Textile, if any such are in use) files.
Perform placeholder and include processing on HTML documents (including HTML generated from Markdown and Textile, if applicable).

Interesting, now you don't even need a static site generator. I could rebuild my neocities site with this…

Big changes to the way appearance and color schemes are managed. Settle in for the read:

Thank goodness! I'd had a couple serious color scheme bugs over the last version, and now it seems like I don't have to constantly resave my color scheme if I tweak it. In addition, I see it's leaving saves of my color scheme in ~/Documents/BBEdit Backups (maybe too many, if I screw around with sliders instead of typing hex RGB).

And tons more, these are just the ones that affect me daily.

Y C?

C has the great virtue that most computers have a C compiler installed or can get one from the vendor, and by typing:

% clang -o thing thing.c # or gcc if you must.

You get a binary that'll run on that platform. If you wrote your code sanely, you can recompile it on every major platform with no changes. If you find a place where a platform's different, you can add #if to fix that.

Contrast with every other systems language:

  • Do you have a compiler installed?
  • Is it portable?
  • Can you even fix non-portable areas?
  • Can you make a binary an end-user can run?
  • Can you call other libraries?

In C, the answer is always yes. In any other, it's "probably not, or only with great effort".

Someone was recommending Ada. It's not in standard gcc. You have to install something called "GNAT":

% sudo port install gnat-gcc
#  Ada is self hosted (  #
#  You need to install an existing Ada compiler and then choose    #
#  an appropiate variant. For more info use:                       #
#  port variants gnat-gcc                                          #
% sudo port variants gnat-gcc
gnat-gcc has the variants:
   ada: Uses the MacPorts Ada ( compiler to bootstrap!
   gnatgpl: Uses GNAT/GPL compiler ( to bootstrap!
   gnuada: Uses the GnuAda ( compiler to
   macada: Uses MacAda compiler ( to bootstrap!
   odcctools: Use the odcctools instead of the system provided ones - does not
              work for x64 currently!

I dunno what to do here. MacAda hasn't been updated since OS X 10.4, which was 2005. I don't see any other ada in MacPorts. At this point I gave up and uninstalled everything. It's not a working language.

Go is fine except that it's a statically-compiled Java owned by Google, and every part of that is evil and wrong. The Rust Evangelism Task Force's constant whining has made me unwilling to even give all those &'s a chance, they're like digital Mormons. There's nothing really wrong with D Language except that it's not installed anywhere, and it's no safer than C for a lot of extra typing.

C isn't safe, but it's fast. It's pretty hard to use safely on large projects, but for small tools with static data buffers it's fine. You take some tradeoffs for any language.

For high-level programming, I love Scheme and JavaScript, and there's a ton of other good high-level languages. But if you need to write at the lowest level, and make it work everywhere, C's the only rational choice.

Fall of Visual Basic, Rise of QuickBasic?

There was simply no other tool that a developer could use to sketch out a complete user interface and get coding as quickly as VB.

Except Smalltalk on the Xerox Star (1981), ResEdit on Classic Mac (1984), RCS and ORCS on Atari ST (1985), Hypercard (1986), Interface Builder on NeXTstep (1988), and others; Visual Basic came out in 1991, Delphi came out in 1995. Maybe there was no other tool on brain-damaged DOS/Windows systems before VB, I can buy that, but real computers were doing RAD a long time ago.

Alan Cooper, the "father" of Visual Basic, has done some really interesting work with interaction design and user experience, but he didn't invent RAD. VB started life as his project "Tripod", a shell creation tool, basically a user-customizable program launcher or "wizard". Then Microsoft bought it and turned it into "Visual Basic", as a kind of ugly Hypercard (is BASIC a worse language than HyperTalk? Eh.)

VB became famous for a legendary feature called edit-and-continue, which allowed developers to run their programs, find problems, fix them, and then keep going with the new code. This was a sharp difference from almost every other programming environment known to humanity, which force developers to recompile their work and start over after every change.

This is, of course, utterly wrong. Every language with a REPL can do this: You write some code in the REPL, run it, it crashes or produces wrong results, you change the one offending function and resume. All global objects are still present, no recompile necessary.

#;2> (define (hello name) (error 'hello "Unimplemented")) #;3> (define (greetings) (for-each hello '(Cthulhu YogSothoth ShubNiggurath))) #;4> (greetings) Error: (hello) Unimplemented #;4> (define (hello name) (printf "Ia ia, ~A fhtagn!\n" name)) #;5> (greetings) Ia ia, Cthulhu fhtagn! Ia ia, YogSothoth fhtagn! Ia ia, ShubNiggurath fhtagn!

The one difference is that to save state, you have to copy-paste out of .csi_history or whatever. IDLE lets you save off your session history directly, but you still have to edit it into a working script. VB did have the virtue of staying in the live editor, but you're still just coding behind buttons, you have no access to a history or REPL.

(This is why I dislike DrRacket so much: If you edit code, it does destroy your global REPL state! Why even have a fake-REPL there, man?! Command-line Racket doesn't have this problem, but it's still not a great Scheme.)

Just as VB acquired the same power as C#, C# picked up the same conveniences as Visual Basic. For example, .NET’s type safety and memory management features meant that C# developers never needed to worry about memory leaks, just like VB developers.
In other words, C# now had the guardrails to protect hobbyists, students, and new programmers without surrendering its power. All of a sudden, VB was no longer something special. It was just another tool in a capable programmer’s toolkit.

Every part of that is… well, not correct.

  1. My understanding is VB.NET was a mess interacting with .NET resources, so if you used it you were still stuck in the VB gulag or had to learn so much C# or C you might as well move up.
  2. C# is a hard language to start up in, you would never give it to a newbie and say "good luck!"; although that's what Unity does, and most Unity code is nightmarish as a result.
  3. C# is certainly not "never need to worry about memory leaks"; it's a Java ripoff with more native libraries, many of which have dangerous C++ based memory management, and in any case you can over-retain things and fill up memory very quickly.
  4. No capable programmer is going to say "this project is best in… Visual Basic dot Net!" Except on broadcast TV-for-morons.

The one good thing from all this:

An innovative project called QB64 has created a modern QuickBASIC replica. It runs on Windows, MacOS, and Linux, with no emulator required.

OK, this is interesting. Terrible domain name though, what is happening there? Just redirects to that mess.

Once you run the setup_osx.command, it has a qb64 binary, which opens a DOS-like window with the old DOS qbasic.exe UI. Huh. This isn't bad, though the font is small and the only way to change it is with a custom font. It ships with a cyberbit.ttf font which is pretty but very W I D E.

Writing something and hitting Run|Start dumps an untitled binary in the main directory. Saving (to the programs folder in this package) and then hitting the Run|Output EXE to Source Folder toggle does something more reasonable: hello.bas, hello, hello_start.command. A trivial program is 1186K, which is excessive, but it does work, opens a terminal and shows some text.

There's a ton of sample code in program/samples, including a lot of 3D stuff.

This is a pretty credible BASIC environment.


  • Structured BASIC, if you want it.
  • You can just recompile on every platform.


  • No interactive REPL (that was one of the few things classic line-oriented BASIC, or hybrids like ST BASIC, had going for them).
  • Slow compile.
  • Ugly editor, though probably playing with fonts and colors would improve this.

You'll always be better off just giving a newbie Python, but some people may have old code or nostalgia.

  • Chipmunk BASIC is certainly nicer as an interactive environment, but probably hundreds of times slower.

Catalina Scripting

In particular:

Quartz Composer
Starting in macOS 10.15, the Quartz Composer framework is deprecated and remains present for compatibility purposes. Transition to frameworks such as Core Image, SceneKit, or Metal. (50911608)

Tragic but unsurprising. None of those are even remotely a replacement, being machine-level programming tools, not a graphical tool for assembling a graphics or sound workflow. But there's probably almost nobody using QC anymore, because Apple neglects it and won't promote any dev tools except horrible goddamned walking abomination Xcode.

Script Editor
Known Issues
Script Editor might quit unexpectedly when saving or executing scripts. (50470730)
Scripting Language Runtimes
Scripting language runtimes such as Python, Ruby, and Perl are included in macOS for compatibility with legacy software. Future versions of macOS won’t include scripting language runtimes by default, and might require you to install additional packages. If your software depends on scripting languages, it’s recommended that you bundle the runtime within the app. (49764202)
Use of Python 2.7 isn’t recommended as this version is included in macOS for compatibility with legacy software. Future versions of macOS won’t include Python 2.7. Instead, it’s recommended that you run python3 from within Terminal. (51097165)

More of the same, increasingly neglected non-Xcode tools.

Killing python2 is great. It's not clear if python3 will be included standard, or if you have to find that somewhere else.

On my old blog, I had a post "Macs Make Programmers", where I talked about all the great scripting languages and tools included in OS X, including Xcode back when it wasn't broken junk. Timmy Cook's Apple is making that very difficult.

So basically the first thing you need to do on a Mac is install MacPorts, sudo port install python3 and so on.

On the bright side:

This is a massive step up in security and usability. I was a long-time ksh user on HP-UX, Atari ST MiNT, and OS/2, switched to bash for Linux back in '95-ish, and went along with bash on OS X, even though the original default was tcsh. I switched to zsh in 2014, after the bash shellshock bug; and it was long overdue. Apple can't follow the current bash versions because they're under poisonous GPLv3, so even with shellshock patched it's still not safe. zsh is reasonably current and MIT-licensed so it can stay current.

You want one reason to switch right now?

F="foo bar"
rm $F

In bash, that removes two files, "foo" and "bar". In zsh, it removes one file, "foo bar" (you can get the Bash-like behavior of expanding args by rm $(echo $F), probably some other ways).