Romain Vincent <rom...@rwigo.com> 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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<https://bugs.python.org/issue43379>
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