10000 bpo-43283: Add IDLE doc paragraph about print speed by terryjreedy · Pull Request #24615 · python/cpython · GitHub
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Merged
merged 5 commits into from
Feb 24, 2021
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bpo-43283: Add IDLE doc paragraph about print speed #24615

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eebd004
bpo-43283: Add IDLE doc paragraph about print speed
terryjreedy Feb 21, 2021
06a426b
Update Doc/library/idle.rst
terryjreedy Feb 22, 2021
6ad67ba
Merge branch 'master' of https://github.com/terryjreedy/cpython into …
terryjreedy Feb 24, 2021
cd294d4
Merge branch 'print-speed' of https://github.com/terryjreedy/cpython …
terryjreedy Feb 24, 2021
974fb15
Update idlelib news and help.
terryjreedy Feb 24, 2021
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bpo-43283: Add IDLE doc paragraph about print speed 
Printing to IDLE's Shell is often slower than printing to a system
terminal, but it can be made faster by pre-formatting a single
string before printing.
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@terryjreedy
terryjreedy committed Feb 21, 2021
commit eebd004d667b7f9513aa84f02ef19f7e5ce3ee95
9 changes: 9 additions & 0 deletions Doc/library/idle.rst
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Expand Up @@ -726,6 +726,15 @@ with objects that get input from and send output to the Shell window.
The original values stored in ``sys.__stdin__``, ``sys.__stdout__``, and
``sys.__stderr__`` are not touched, but may be ``None``.

Sending print output from one process to a text widget in another is
slower than printing to a system terminal in the same process.
This has the most effect when printing multiple arguments, as the string
for each argument, each separator, the newline are sent separately.
For development, this is usually not a problem, but if one wants to
print faster in IDLE, format and join together everything one wants
displayed together and then print a single string. Both format strings
and ``separator.join`` can help combine fields and lines.

IDLE's standard stream replacements are not inherited by subprocesses
created in the execution process, whether directly by user code or by
modules such as multiprocessing. If such subprocess use ``input`` from
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/IDLE/2021-02-21-16-30-10.bpo-43283.DLBwYn.rst
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Document why printing to IDLE's Shell is often slower than printing to a
system terminal and that it can be made faster by pre-formatting a single
string before printing.
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