Terry J. Reedy <tjre...@udel.edu> added the comment:

I don't know whether memory difference between us is due to IDLEX or Windows 
version or something else, but I don't really care.  The IDLE doc has a section 
"IDLE-console differences".  It should gain a paragraph explain the difference 
between memory-limited tk.Text-based Shell and limited-lines consoles.  For 
Command Prompt, the buffer defaults to a pathetic 300 lines, which is not 
enough for the CPython test suite output.  The max is 9999 for those who 
discover how to enlarge it.  No limit is an advantage for most uses, but not 
for one who fills up memory.

I will also think about a sentence to add to the introductory section about 
development versus production runs.

components: +Documentation
stage:  -> needs patch
title: IDLEX GUI consumes all RAM for scrollback buffer, uses 161Bytes / 
character stored -> IDLE Doc: Text consumes unlimited RAM, consoles likely not
versions: +Python 3.7, Python 3.8

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