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okay, f# has curly braces. but not in the sense of other C-like languages like c++, java, and c#. they are primarily used for sequence expressions and computati

okay, f# has curly braces. but not in the sense of other C-like languages like c++, java, and c#. they are primarily used for sequence expressions and computation expressions like async. > I see that F# has a REPL, but it seems bolted on as an afterthought instead of being an integral part of the language. (Also, it's not clear whether the REPL is available in Mono on Linux. I am allergic to Windows and anything built by Microsoft.) well that first sentence is simply not true, and i don't know what gave you that impression. f#'s repl, f# interactive, is available on linux through mono and will soon be available through .net core. i can't help you being needlessly allergic to a major operating system or company. f# came out of microsoft research. > Huh? Python expressions always return a value. they do? take: def test(x): "something" so what does test(2) return? > I don't owe it to myself to learn anything unless I decide to. I wasn't trying to convince anyone else to use Python; I was just giving reasons why I like Python. Please extend me the same courtesy when you talk about things you like about your favorite languages. i don't know why you're upset. i am not for sure where i was discourteous. i didn't mean anything by my statement other than to check out the languages and courses (the coursera one is very good). if those are your reasons for python, i just thought you would honestly like an ML-based language. i just used "owe it to yourself" as an expression, which apparently came out wrong through text. of course you don't owe anyone anything. i was just making a suggestion.

codexon 8y ago
>>> test(2) is None True
- nikofeyn 8y ago
  i guess that is true in python3 but it is not in python 2.7.
  - xapata 8y ago
    False. You're just not familiar with how the REPL works. >>> None >>> print(None) None In the future, you might want to refrain from strong criticism of a thing you're not familiar with. That habit leads to all sorts of -isms.
    - nikofeyn 8y ago
      i do know how the repl works. i explicitly tried it out. i defined the function just as i said and ran test(2) is None and got false. i just now went to try it out again at home and got true. i don't know what to tell you other than something must have got shadowed somewhere.
      - pdonis 8y ago
        Here's what I get from the Python 3 REPL: peter@localhost:~$ python3 Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> def test(x): ... "something" ... >>> test(2) is None True And Python 2: peter@localhost:~$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> def test(x): ... "something" ... >>> test(2) is None True If you post such a transcript from your REPL session where you get False, it should be easier to tell what's different between your setup and mine (which is a stock Python install on Ubuntu 16.04). However, there is another even more direct experiment you could have run at the Python REPL to see what Python expressions return: just type the expression directly at the REPL and see what it prints back at you. In Python 3: peter@ToshibaSatellite:~$ python3 Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> "something" 'something' And in Python 2: peter@ToshibaSatellite:~$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> "something" 'something' So, in your test function above, the expression "something" does return itself; it just does it inside the function, and that return value then gets thrown away when the function exits, because you didn't return it from the function itself.
        nikofeyn 8y ago
        i know how to use the repl. i moved between computers during comments and wasn't able to inspect my repl session where it originally returned false. as i mentioned, i must have redefined something or shadowed something which caused confusion, and i just didn't realize it at the time.
firefwing24 8y ago
Replying to your reply of the child comment: > i guess that is true in python3 but it is not in python 2.7. No, it's always been there. >>> def f(): ... pass ... >>> f() is None True
pdonis 8y ago
> of course you don't owe anyone anything Yes, and thanks for acknowledging that. But then the phrase "owe it to yourself" didn't really communicate your intent correctly, which is why I objected to it.

codexon 8y ago

>>> test(2) is None True

nikofeyn 8y ago
i guess that is true in python3 but it is not in python 2.7.
- xapata 8y ago
  False. You're just not familiar with how the REPL works. >>> None >>> print(None) None In the future, you might want to refrain from strong criticism of a thing you're not familiar with. That habit leads to all sorts of -isms.
  - nikofeyn 8y ago
    i do know how the repl works. i explicitly tried it out. i defined the function just as i said and ran test(2) is None and got false. i just now went to try it out again at home and got true. i don't know what to tell you other than something must have got shadowed somewhere.
    - pdonis 8y ago
      Here's what I get from the Python 3 REPL: peter@localhost:~$ python3 Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> def test(x): ... "something" ... >>> test(2) is None True And Python 2: peter@localhost:~$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> def test(x): ... "something" ... >>> test(2) is None True If you post such a transcript from your REPL session where you get False, it should be easier to tell what's different between your setup and mine (which is a stock Python install on Ubuntu 16.04). However, there is another even more direct experiment you could have run at the Python REPL to see what Python expressions return: just type the expression directly at the REPL and see what it prints back at you. In Python 3: peter@ToshibaSatellite:~$ python3 Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> "something" 'something' And in Python 2: peter@ToshibaSatellite:~$ python Python 2.7.12 (default, Dec 4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> "something" 'something' So, in your test function above, the expression "something" does return itself; it just does it inside the function, and that return value then gets thrown away when the function exits, because you didn't return it from the function itself.
      - nikofeyn 8y ago
        i know how to use the repl. i moved between computers during comments and wasn't able to inspect my repl session where it originally returned false. as i mentioned, i must have redefined something or shadowed something which caused confusion, and i just didn't realize it at the time.

firefwing24 8y ago

Replying to your reply of the child comment: > i guess that is true in python3 but it is not in python 2.7. No, it's always been there. >>> def f(): ... pass ... >>> f() is None True

pdonis 8y ago

> of course you don't owe anyone anything Yes, and thanks for acknowledging that. But then the phrase "owe it to yourself" didn't really communicate your intent correctly, which is why I objected to it.