Bug report

Bug description:

I encountered the following unexpected behavior when working with the new REPL on Windows 10'scmd just now:

Actual Behavior

>>>foriinrange(0,14,2):...print(i,end=" ")...>>>4681012

• When I use print and pass an argument to theend-parameter, the resulting line is missing 4 characters.
• The four chars of the REPL prompt>>> appear to write over the line, as the cursor blinks on the first visible position (indicator sits under the number 4)
• Typing overwrites the shown chars.

Expected Behavior

>>>foriinrange(0,14,2):...print(i,end=" ")...024681012>>>_

• REPL on Python 3.12 works as expected.
• Results are printed in one line, prompt appears at the end, cursor follows at end of line.

Note:

This works as expected:

>>>foriinrange(0,14,2):...print(i)...024681012

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Linked PRs

• gh-128067: Add newline to new REPL output when needed to avoid chopping characters #131011
• gh-128067: Fix pyrepl overriding printed output without newlines #138732
• [3.14] gh-128067: Fix pyrepl overriding printed output without newlines (GH-138732) #143350
• [3.13] gh-128067: Fix pyrepl overriding printed output without newlines (GH-138732) #143351
• gh-128067: In test_pyrepl, discover escape sequences from terminfo instead of using hard-coded values #143356