[issue43379] Pasting multiple lines in the REPL is broken since 3.9

[Ned Deily]

Ned Deily  added the comment:

It certainly could be an issue with using GNU readline vs libedit and Terry is 
correct that you should follow up with Homebrew. But I don't think you stated 
from which code editor application you were copying from; that could also make 
a difference. In any case, good luck!

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[issue43379] Pasting multiple lines in the REPL is broken since 3.9

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Thank you for retesting with the python.org installer.  Since this is Homebrew 
specific, please open an issue with them, with the updated debug information.

--
resolution:  -> third party
stage:  -> resolved
status: open -> closed

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[issue43379] Pasting multiple lines in the REPL is broken since 3.9

[Romain Vincent]

Romain Vincent  added the comment:

The lack of dots was something I noticed.

So from your questions (Ned Deily) I have been testing out several things and 
found a "wae"!

But first, to answer your questions:

1. both LF and CRLF and it didn't change anything.

2. Running "import readline;print(readline.__doc__)" prints
"... GNU readline", with python 3.7, 3.8 and 3.9.

3. I am using iTerm2, but the problem also happens on MacOS's native 
Terminal.app. Versions of python were installed with **homebrew**.


Maybe worth to mention: if I paste my code in a multi line string to execute 
with python -c, then it works properly.

e.g.

---

python3.9 -i -c 'a = 42
if a:
  print("hello world")
'
hello world
>>>

---

The example is different because I realized I had the same problem on python3.7 
and python3.8 when the 2 first lines were at the same level of indentation 
(Note sure if this gives a hint as to what the problem is).



HOWEVER, if I use python versions directly downloaded from 
https://www.python.org/, then I don't have the problem at all!

Demonstration:

---
/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7
Python 3.7.2 (v3.7.2:9a3ffc0492, Dec 24 2018, 02:44:43) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import readline;print(readline.__doc__)
Importing this module enables command line editing using libedit readline.
>>> a = 42
>>> if a:
...   print("hello world")
... 
hello world
>>> 

---

Same for python3.9

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[issue43379] Pasting multiple lines in the REPL is broken since 3.9

[Terry J. Reedy]

Terry J. Reedy  added the comment:

On both Windows and macOS Mohave with both 3.9 and 3.10 I get normal behavior.

If it were not for the $ python3.x line, the missing '... ' in Romain's output 
would have suggested that he was using IDLE.  But IDLE should accept pasted 
ascii statements just fine.

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nosy: +terry.reedy

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[issue43379] Pasting multiple lines in the REPL is broken since 3.9

[Ned Deily]

Ned Deily  added the comment:

Sorry, I cannot reproduce that behavior. The output you show isn't what I would 
expect, in any case.

$ python3.8
Python 3.8.7 (v3.8.7:6503f05dd5, Dec 21 2020, 12:45:15)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def f():
... print("hello world")
...
>>> ^D
$ python3.9
Python 3.9.1 (v3.9.1:1e5d33e9b9, Dec  7 2020, 12:44:01)
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def f():
... print("hello world")
...
>>> ^D

Note the missing '...' continuation prompts.  So can you verify that the text 
when you paste it includes just a standard linefeed (LF) control character as 
the end-of-line delimiter?  Other possible differences might be whether the 
python in use was linked with the BSD libedit library or with GNU readline but 
that shouldn't make a difference unless you have some non-default options in 
their configuration files.  You can check which one is in use with this:

$ python3.8 -c "import readline;print(readline.__doc__)"
Importing this module enables command line editing using GNU readline.
$ python3.9 -c "import readline;print(readline.__doc__)"
Importing this module enables command line editing using libedit readline.

If all else fails, from where did you obtain the pythons that you are using?  
And in what environment are you running those commands, i.e. the macOS 
Terminal.app?

--
nosy: +ned.deily

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[issue43379] Pasting multiple lines in the REPL is broken since 3.9

[Romain Vincent]

New submission from Romain Vincent :

DISCLAIMER: This is the first time I submit an issue here. In advance, my 
humble apologies if I missed something.
Feel free to correct me :)

--

I regularly test snippets of code by pasting them from a code editor to a shell 
REPL.

It works perfectly well in python 3.8 or 3.7 but not in python 3.9.

Demonstration:

Try to copy and paste the following simple snippet:

---

def f():
print("hello world")

---

The result in a python 3.8 REPL (same with 3.7):

---

$ python3.8
Python 3.8.6 (default, Nov 20 2020, 18:29:40)
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def f():
print("hello world")
>>> f()
hello world

---

But with python 3.9:

---

$ python3.9
Python 3.9.1 (default, Dec 10 2020, 10:36:35)
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def f():
print("hello world")
  File "", line 1

^
SyntaxError: multiple statements found while compiling a single statement

---

This behavior happens with any snippet of code containing at least one indented 
line, whether by tabs or spaces and whatever the number of spaces.


Regards.

--
components: IO
messages: 387976
nosy: romainfv
priority: normal
severity: normal
status: open
title: Pasting multiple lines in the REPL is broken since 3.9
type: behavior
versions: Python 3.9

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