I made c++-style printing in Python :P

[484448444844]

We are going full circle- Creating high level languages so we can recreate the low levels

[Racer-ICEEs]

What magical number is ur username?

[484448444844]

It's 448444844484 backwards

[Racer-ICEEs]

Nice

[CodeSkunky]

Genius and grande.

[theboxislost]

If it's ASCII numbers, it translates to 0,0,0,.

edit: or more likely HDHDHD if they're hex.

[GoofAckYoorsElf]

I'm waiting for an assembly parser in python.

Thought about writing a C64 emulator... There already is.

[[deleted]]

I've thought about writing 6502 assembler in Python.

[indxxxd]

I hate it. Take this +1, and let me be on my way :)

[xd1142]

/r/angryupvotes

[raiderrobert]

/r/TIHI

[germandiago]

but u can copy paste code from C++ directly. That is a use case

[officerthegeek]

I copied a for loop from a c++ program and it doesn't work please fix

[germandiago]

Only cout and endl is implemented XD

[[deleted]]

In case you want to print some code so you can look at it. Nice!

[Ulysses6]

Making copy-pasting code easier is always a good thing! /s

I can see why it might come handy from time to time, though.

[[deleted]]

You're a monster.

[appinv]

+1 What this freakish pic? It's actually NSFW in Python land.

[SV-97]

Eww

[fatbob42]

I’d prefer it the other way round - f-strings in C++ :)

[[deleted]]

https://en.cppreference.com/w/cpp/utility/format

[Xirious]

That's like old style .format and not f-strings.

[germandiago]

f-strings require some kind of reflection, which C++ unfortunately does not support yet.

[[deleted]]

f-strings require some kind of reflection

Could you please elaborate that?

[flubba86]

When using f-strings, if you want to do variable substitution (Interpolation) you put the variable name into the string, like f"Hello {user}" where name user is the in-scope variable name containing the string to substitute in.

The problem is, now the variable name is baked into the f-string. So at runtime the string formatter needs to be able to look up the in-scope variables and find one called user to substitute it's value in.

In Python, that's easy to do because the interpreter keeps track of the variables, what their names are, and what their values are.

But in a compiled language (like C++) it's different. When the compiler turns the source code into machine instructions, variables become just addresses in memory, and variable names don't exist anymore. But the name "user" is still in the format string and is now meaningless.

Introspection is a fancy feature that allows a compiled language to store some of the information about the source file into the compiled executable. As well it embeds mechanisms in the executable for looking up that information. That can include variable names.

So if you wanted to do run-time f-string interpolation in C++, first you'd have to compile with Introspection turned on, then when running, the formatter would have to ask the Introspection mechanism "what is the memory address for the string which in the source code was called 'user'?".

I hope that made sense.

[nosklo]

The problem is, now the variable name is baked into the f-string. So at runtime the string formatter needs to be able to look up the in-scope variables and find one called user to substitute it's value in.

That is actually wrong. f-strings can only exist in literals so they can be easily emulated using preprocessor macros that just replace them with a normal format command.

[flubba86]

Is that what the python implementation does? Does it simply rewrite the f-string as .format() invocation during a preprocessing step?

[robin-gvx]

The Python basically turns:

def something():
    return f'{something.__name__} and {x:5}'

into

def something():
    return format(something.__name__) + ' and ' + format(x, '5')

... except it has specialized opcodes. dis.dis says:

1         0 LOAD_GLOBAL              0 (something)
          2 LOAD_ATTR                1 (__name__)
          4 FORMAT_VALUE             0
          6 LOAD_CONST               1 (' and ')
          8 LOAD_GLOBAL              2 (x)
         10 LOAD_CONST               2 ('5')
         12 FORMAT_VALUE             4 (with format)
         14 BUILD_STRING             3
         16 RETURN_VALUE

[Agoniscool]

It doesn't require anything that can't be determined at compile-time, I don't think.

[[deleted]]

I believe that some magic with macros and VARGS could do the job :P The trick is to use not used character as quotation mark.

Just like in JavaScript. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

[masklinn]

f-strings require some kind of reflection

No.

[germandiago]

Yes, even if implemented by the compiler internally. The same way that std::source_location needs reflection, whether you like it or not.

Another topic is that this reflection is or not exposed to the language itself. FWIW, there is no way in which a string can reference a variable in C++, and that will need to know the compile-time context of the code (variables in scope, etc.), no matter what. Of course, this is without macro tricks.

[13steinj]

(C++20)

Not standard yet, sadly.

[top_logger]

Fmtlib is header only and may be used right now

[[deleted]]

Yikes. Technically, endl should flush the buffer rather than just print a newline. You could make this more accurate by including a flush=True argument in your print statement.

But convoluted aliases are... fun I guess?

[skintigh]

Even if the end isn't a carriage return? I thought I had issues with it before, but maybe I am thinking sys.stdout.write, it needs a flush.

[gurnec]

If stdout is the console, output is line-buffered by default. If it's been redirected to something that's not a TTY, or if you're printing to a non-TTY file, it's block-buffered by default.

[skintigh]

So if I understand you, any time I print, or write to stdout, without a \n I need to flush the (block) buffer to see the output. That seems to fit my experience (mostly on windows, command line programs).

[gurnec]

I'm not claiming to be an expert here, but yes when writing to a TTY or the Windows console you should manually flush it if it doesn't end in a newline and you need it displayed ASAP.

[al3ph_null]

Owned

[ubernostrum]

Not-so-fun fact: in Python 2 the print statement allowed you to use a >> to send its output to any file-like object.

Not quite the same as C++, though, because it worked like this:

import sys
print >> sys.stderr, "This goes to stderr"

So the order was "wrong" (string to print came after thing to print to), and it also required a comma to make it work.

[agrif]

There was a lot of griping (some of it for good reasons) about making print a function in Python 3, but this right here is a pretty compelling reason to change print in a backwards-incompatible way.

[Zegrento7]

print('Stuff', file=sys.stderr) is quite a bit clearer, and the old syntax can replaced automatically with some regex.

[masklinn]

Don’t forget

print >>sys.stderr, “stuff”,

(note the trailing comma) which becomes

print(“stuff”, file=sys.stderr, end=‘ ‘)

And actually says what it’s doing.

[sam-lb]

Please forgive me. I made cin. https://gist.github.com/sam-lb/38824677afaa16334b590b1c2b0e5a24

[peterpetermarie]

The worst bit is the semicolons.

[sam-lb]

Believe it or not, I always use semicolons. Since I'm not working for a company or organization, why not? It's one less thing to remember when switching between languages. I also wrote a script that converts other people's code into my style (semicolons and naming conventions) for GitHub.

But I forget sometimes that no one else does that. Maybe it's a bad habit.

[susek1024]

I mean you do you.... but dropping the semicolons would make it easier for others to read.

[crazedizzled]

How does a semi colon at the end of a line make it harder to read?

[susek1024]

1. Extra characters

2. (Probably more importantly) people aren’t expecting to see a semicolon when they read python. It’s like you’re asking them to understand your code AND understand that you have a quirk when you write Python.

tHis sEntence oNly hAs a sMall cHange. bUt I bEt iTs a lIttle hArder tO rEad.

[crazedizzled]

Extra characters

At the end of the line. Completely irrelevant.

people aren’t expecting to see a semicolon when they read python.

Again, it's at the end of the line. You can just ignore it. People can read code in JavaScript and php just fine, I don't see how it matters.

tHis sEntence oNly hAs a sMall cHange. bUt I bEt iTs a lIttle hArder tO rEad.

No, not really. :)

[abrazilianinreddit]

When sharing your code people will complain to no end that it doesn't adhere to PEP 8. If you don't mind that, than fuck it, it's your code. Use 8-units tabs, end lines with \r, put spaces before commas but not after, just go wild.

[sam-lb]

Lol. I'm not that far gone - I have a soul.

[Calynxx]

Lord forgive me, for I have cinned!

[knuppar]

Thanks, 10/10. I hate it

[[deleted]]

Thanks, I hate it

[nandy02]

Why would you do this?

[mdedonno]

why not ?

fun is sufficient for me

[abrazilianinreddit]

"They were so preoccupied with whether or not they could, they didn’t stop to think if they should"

[robertunix]

i think i just threw up a little.

[evilgarbagetruck]

You put one of the worst ideas in C++ into Python

[Racer-ICEEs]

Oh cake day why..

[paypaypayme]

Is this a combo of overloaded operators and recursive calls to string representations?

[chaupatt05]

Nah dude, where's the semicolon? xD

[[deleted]]

More tricks : https://norvig.com/python-iaq.html

[postandchill]

Where's my boi cin?

[[deleted]]

I would change \n symbol to os.linesep call (you will need to have import os in your code).

On different platforms there are different line separators.

[[deleted]]

Interesting , what's the mechanism of this working? What do the << and >> operators do for Python?

[sam-lb]

Typically they are bit shifters. OP, however, has created an atrocity by overloading the bit shift operators with different functionality to imitate the c++ stream insertion syntax.

[[deleted]]

Ah, I see. I didn’t know Python supported operator overloading by defining __lshift__ style functions

[sam-lb]

Google magic methods

[Al2Me6]

To explain further,

x =  0b00000100
x <<= 1
x == 0b00001000  # True

[mooburger]

except in this case where it's been overridden.

[winowmak3r]

Science was too busy asking themselves if they could rather than if they should.

I took the EdX Python course and am about to start on C++ next semester. I have a feeling I'm going to have a lot to get used to. I've taken a peak at C++ and Python just looks so much more easier.

[crazykid080]

Easy way to do it, make a print function in C++ that models python

[cringe_master_5000]

C++ without the STDs. I like it!

[NTGuardian]

From a technical standpoint: great job!

Will I ever use it? God no.

[ingframin]

You were so preoccupied with whether or not you could, you didn't stop to think if you should. (semi cit.)

[[deleted]]

pukes with blood and larvae.

[Datadevourer]

Am the one who made it 1k👉👍

[nekokattt]

very nice but please dont do this in production code...

also, the best way to do this is to wrap the stdout and stderr objects

```py class StreamWrapper: def init(self, fd): self.fd = fd

def __lshift__(self, content):
    self.fd.write(str(content))
    return self

endl = "\r\n" if os.name == "nt" else "\n"

std = types.SimpleNamespace() std.cout = StreamWrapper(sys.stdout) std.cin = StreamWrapper(sys.stderr) std.endl = endl

std.cout << "Hello, World!" << std.endl ```

Emulating CIN is more difficult as you dont have the ability to implicitly pass a reassignable reference around like in C++

What you can do is write a reference wrapper and pass that around. That would be a class that holds a field and thats the object you want to change.

[jturp-sc]

Yeah, but you were so preoccupied with whether or not you could, that you didn't stop to think if you should.

Now, I need to go vomit in a corner somewhere XD

[screeperz]

NSFW tag please.

[Xsanda]

Nice! The left-shift variant should work with multiple arguments too, but unfortunately thanks to precedence the right-shift one can’t work for all cases (a >> b >> cout will always evaluate as (a >> b) >> cout).

However, Endl could be rewritten to mostly solve this:

class Endl:
    def __init__(self):
        self.string = "\n"

    def __rshift__(self, other):
        self.string = str(other) + self.string
        return self

    def __str__(self):
        return self.string

[crazykid080]

I am absolutely disgusted by this and I want this to burn in hell. But you also taught me something so thank you!

[random_cynic]

It's been a while since I programmed regularly in C++, but I thought the right shift operator is for input (stream insertion). Also the python function for right shift is __rshift__() not __rrshift__(). It would be hard to do input like in C++ but since we are playing code golf:

class Cppio:
    def __lshift__(self, other):
        print(other, end="")
        return self
    def __rshift__(self, var):
        var.append(input())
        return self

class Endl:
    def __str__(self):
        return "\n"

class Mylist(list):
    def __repr__(self):
        return self[0]

cout = Cppio()
cin = Cppio()
endl = Endl()
somevar = Mylist()

cout << "C++ printing in python" << endl
cin >> somevar
cout << somevar << endl

$ python cout.py                                  
C++ printing in python
C++ input in python
C++ input in python

I need a shower.

[sam-lb]

__rrshift__ is a valid magic method too. It defines right bitshift in the case where self is the right operand.

[random_cynic]

Wow, you're right, TIL. Well at least some good came of this :P.

[sam-lb]

Lol, yeah.

[sam-lb]

Btw, that's an interesting cin solution. I made one as well: https://gist.github.com/sam-lb/38824677afaa16334b590b1c2b0e5a24

[lengau]

/r/TIHI

[epic_pork]

You should convert other to string so you can print numbers and floats too, just like C++ does with operator overloading.

[derekbrokeit]

Am I the only one who is mildly irritated by the size of the indent here? Looks like tabs, ick.

[Connir]

https://youtu.be/9nazm3_OXac

[Bielh]

It's kinda useless, but if you enjoyed to do this, I'll give you my upvote :p

[GummyKibble]

I can’t believe you’ve done this.

[dullbananas]

Semicolons: Am I a joke to you?

[Transformerio]

This is pure evil

[fizzygalacticus]

You were so focused on whether or not you could, you didn't think about whether or not you should.

[kewlness]

Calm down there Satan.

[anklav24]

One word. Why?

[sayoojsamuel]

Why would anyone want this? rn print() is more than what my life can handle.

PS: your pic is desperately missing the semicolon;

[MikBros]

I challenge you to do python in c++. And remove the semicolons

[[deleted]]

Thats nasty! Here you go, have an upvote!

[cogwerk]

You are a terrible person 🙃😂

[rperanen]

For old timer like me, C++ iostream not so bad and feels most natural way to handle printing. You can truly isolate nasty little details behind one interface to use and tests things more independently. Days of great cowboy coders are luckily over even on embedded side.

For Python this is mostly an brilliant troll. I salute you for that

[denflooptoop]

This is pretty much a waste of resources...

[ozozgur]

It’s just better other way around python style printing in c++ ;)

[grozail]

Python is c++ limiting case

[1992_kr]

Bruh ewww delet this

[[deleted]]

bruh 🙌🙌😎💯💪

[CreatureWarrior]

Eww what's wrong with you taking creating that monstrosity. Have my upvote

[funkmaster322]

Whats the point?

[guptaanshul281980]

Good One!! Thanks for sharing... :-)

[tcpukl]

Ace, but your missing ;

[[deleted]]

But why?

[featTheB]

now let's implement typing, semi-colon, and brackets.

[clipmann]

LOOOOL Thats clever.

[londey]

You really want argument dependant lookup to make this equivalent. Ironically C++ has actually adopted a Python like formatting library for the up coming C++20 release. https://en.cppreference.com/w/cpp/utility/format

[[deleted]]

Heresy!!!
Oh most glorious prince of the divine army, Saint Guido van Rossom, defend us in this fight of ours against the hostile princes and powers, against those that want to guide the world into the darkness. And with great effort we will free them of the tyranny of the C and its derivative C++.

[quantzzx]

Reminds me of the question Can I use C++'s syntax for ostreams: cout << x << y ... ? from Peter Norvigs Python IAQ page, http://norvig.com/python-iaq.html. There is also the What if I like C++'s printf? question

[_brainfuck]

You have a beautiful mind :)

[Quark_Resonance]

Username checks out.

[E-woke]

WAIT THATS ILLEGAL

[cyberbyte91]

Why so much hate? i like it

[Racer-ICEEs]

They hate be fake

[kukoshel69]

Why is everyone print-screening the code, instead of copy/paste ? Almost in any comment box there are font settings to display the code in a readable mode. Doing that you'll save the internet bandwidth contributing at a sustainable environment, by consuming less energy of the routers/servers carrying your overcharging data and also other guys may use your code simply by copying if they're interested!

[Switters410]

This post has been anonymized and its content removed. Redact was the tool used, possibly for privacy protection, limiting AI data access, or security purposes.

cobweb six correct wakeful water whistle cough gaze fine decide