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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Newbie question about text encoding
Date: Sat, 07 Mar 2015 01:11:01 -0500
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Xref: csiph.com comp.lang.python:87076

On 3/6/2015 11:20 AM, Rustom Mody wrote:

> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> pp =3D "=F0=9F=92=A9"
> print (pp)
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> Try open it in idle3 and you get (at least I get):
>
> $ idle3 ff.py
> Traceback (most recent call last):
>    File "/usr/bin/idle3", line 5, in <module>
>      main()
>    File "/usr/lib/python3.4/idlelib/PyShell.py", line 1562, in main
>      if flist.open(filename) is None:
>    File "/usr/lib/python3.4/idlelib/FileList.py", line 36, in open
>      edit =3D self.EditorWindow(self, filename, key)
>    File "/usr/lib/python3.4/idlelib/PyShell.py", line 126, in __init__
>      EditorWindow.__init__(self, *args)
>    File "/usr/lib/python3.4/idlelib/EditorWindow.py", line 294, in __in=
it__
>      if io.loadfile(filename):
>    File "/usr/lib/python3.4/idlelib/IOBinding.py", line 236, in loadfil=
e
>      self.text.insert("1.0", chars)
>    File "/usr/lib/python3.4/idlelib/Percolator.py", line 25, in insert
>      self.top.insert(index, chars, tags)
>    File "/usr/lib/python3.4/idlelib/UndoDelegator.py", line 81, in inse=
rt
>      self.addcmd(InsertCommand(index, chars, tags))
>    File "/usr/lib/python3.4/idlelib/UndoDelegator.py", line 116, in add=
cmd
>      cmd.do(self.delegate)
>    File "/usr/lib/python3.4/idlelib/UndoDelegator.py", line 219, in do
>      text.insert(self.index1, self.chars, self.tags)
>    File "/usr/lib/python3.4/idlelib/ColorDelegator.py", line 82, in ins=
ert
>      self.delegate.insert(index, chars, tags)
>    File "/usr/lib/python3.4/idlelib/WidgetRedirector.py", line 148, in =
__call__
>      return self.tk_call(self.orig_and_operation + args)
> _tkinter.TclError: character U+1f4a9 is above the range (U+0000-U+FFFF)=
 allowed by Tcl
>
> So who/what is broken?

tcl
The possible workaround is for Idle to translate "=F0=9F=92=A9" to "\U000=
1f4a9"=20
(10 chars) before sending it to tk.

But some perspective.  In the console interpreter:

 >>> print("\U0001f4a9")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "C:\Programs\Python34\lib\encodings\cp437.py", line 19, in encode=

     return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\U0001f4a9'=20
in posit
ion 0: character maps to <undefined>

So what is broken?  Windows Command Prompt.

More perspective.  tk/Idle *will* print *something* for every BMP char.=20
  Command Prompt will not.  It does not even do ucs-2 correctly. So=20
which is more broken?  Windows Command Prompt.  Who has perhaps=20
1,000,000 times more resources, Microsoft? or the tcl/tk group?  I think =

we all know.

--=20
Terry Jan Reedy