Re: REPL with multiple function definitions
On Wed, 29 Jun 2022 at 11:00, Rob Cliffe via Python-list wrote: > > On 26/06/2022 23:22, Jon Ribbens via Python-list wrote: > > On 2022-06-26, Rob Cliffe wrote: > >> This 2-line program > >> > >> def f(): pass > >> def g(): pass > >> > >> runs silently (no Exception). But: > >> > >> 23:07:02 c:\>python > >> Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 > >> bit (Intel)] on win32 > >> Type "help", "copyright", "credits" or "license" for more information. > > def f(): pass > >> ... def g(): pass > >> File "", line 2 > >> def g(): pass > >> ^ > >> SyntaxError: invalid syntax > >> Is there a good reason for this? > > For some reason, the REPL can't cope with one-line blocks like that. > > If you put a blank line after each one-block line then it will work. > It's actually not to do with 1-line blocks, just attempting to define 2 > functions "at once": > > > 22:27:23 C:\>python > Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 > bit (Intel)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> def f(): > ... return 42 > ... def g(): >File "", line 3 > def g(): > ^ > SyntaxError: invalid syntax > >>> > > But you are right that adding a blank line after the first function > definition solves the "problem". And if you have something where you want to copy and paste multiple statements, there are a few ways to do it: 1) Put "if 1:" at the top. That makes it a single block, so you can paste in as much as you like, as long as the only blank line is at the end. 2) Put the code into a file and then use "python3 -i setup.py". That runs all the code, then drops you into the REPL in that context. 3) Put the code into a file, and inside the REPL, "from setup import *". Unlike option 2, this can be done after the beginning of the session. Downside: editing setup.py and reimporting won't apply your changes. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: REPL with multiple function definitions
On 26/06/2022 23:22, Jon Ribbens via Python-list wrote: On 2022-06-26, Rob Cliffe wrote: This 2-line program def f(): pass def g(): pass runs silently (no Exception). But: 23:07:02 c:\>python Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. def f(): pass ... def g(): pass File "", line 2 def g(): pass ^ SyntaxError: invalid syntax Is there a good reason for this? For some reason, the REPL can't cope with one-line blocks like that. If you put a blank line after each one-block line then it will work. It's actually not to do with 1-line blocks, just attempting to define 2 functions "at once": 22:27:23 C:\>python Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> def f(): ... return 42 ... def g(): File "", line 3 def g(): ^ SyntaxError: invalid syntax >>> But you are right that adding a blank line after the first function definition solves the "problem". Rob Cliffe -- https://mail.python.org/mailman/listinfo/python-list
Re: REPL with multiple function definitions
On 2022-06-26, Rob Cliffe wrote: > This 2-line program > > def f(): pass > def g(): pass > > runs silently (no Exception). But: > > 23:07:02 c:\>python > Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 > bit (Intel)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> def f(): pass > ... def g(): pass > File "", line 2 > def g(): pass > ^ > SyntaxError: invalid syntax > >>> > > Is there a good reason for this? For some reason, the REPL can't cope with one-line blocks like that. If you put a blank line after each one-block line then it will work. -- https://mail.python.org/mailman/listinfo/python-list
Re: REPL with multiple function definitions
Rob Cliffe via Python-list schreef op 27/06/2022 om 0:14: This 2-line program def f(): pass def g(): pass runs silently (no Exception). But: 23:07:02 c:\>python Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> def f(): pass ... def g(): pass File "", line 2 def g(): pass ^ SyntaxError: invalid syntax >>> Is there a good reason for this? The REPL requires an extra empty line to indicate the end of multi-line constructs. You can see it by the prompt: as long as the REPL prints '... ' as prompt, that means it puts everything you type in the same multi-line construct. To enter a new multi-line construct (such as a function definition, a for-loop, an if-statement, ...), press enter directly at the prompt; the REPL should than use '>>> ' as the prompt again. (Alternatives like IPython (https://ipython.readthedocs.io/en/stable/) are a bit more loose regarding how to enter multi-line constructs) -- "Iceland is the place you go to remind yourself that planet Earth is a machine... and that all organic life that has ever existed amounts to a greasy film that has survived on the exterior of that machine thanks to furious improvisation." -- Sam Hughes, Ra -- https://mail.python.org/mailman/listinfo/python-list
Re: REPL with multiple function definitions
On Mon, 27 Jun 2022 at 08:15, Rob Cliffe via Python-list wrote: > > This 2-line program > > def f(): pass > def g(): pass > > runs silently (no Exception). But: > > 23:07:02 c:\>python > Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 > bit (Intel)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> def f(): pass > ... def g(): pass >File "", line 2 > def g(): pass > ^ > SyntaxError: invalid syntax > >>> > > Is there a good reason for this? The REPL compiles one statement at a time. A file is allowed to contain multiple statements. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
REPL with multiple function definitions
This 2-line program def f(): pass def g(): pass runs silently (no Exception). But: 23:07:02 c:\>python Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:20:19) [MSC v.1925 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> def f(): pass ... def g(): pass File "", line 2 def g(): pass ^ SyntaxError: invalid syntax >>> Is there a good reason for this? Thanks Rob Cliffe -- https://mail.python.org/mailman/listinfo/python-list
