New submission from Dave Rove <[email protected]>:
The correct handling of ANSI escape codes by the print() function may or may
not be enabled in the Windows 10 command prompt window, depending on previous
system calls. The following is quite repeatable. Comment-out the apparently
meaningless os.system("") line and ANSI codes do not work, but leave that line
in and ANSI codes DO work:
import os
os.system("") # Comment this out to disable ANSI codes
ansi_red = "\x1b[31m"
ansi_normal = "\x1b[0m"
print(ansi_red + "This is red!" + ansi_normal)
To be consistent with Python on Linux and Mac, I believe that ANSI codes should
be permanently enabled in Windows 10 rather than removed. ANSI code handling
was present from the start of Windows 10, so it's reasonable to presume that
it's now a permanent feature of the Windows command prompt window. Either way,
the inconsistency of the handling should be fixed.
To emphasize that ANSI codes ARE a feature of the command prompt, comment out
that line to disable the ANSI codes in print(), but redirect the output to a
text file. Then display that file at the command prompt. The ANSI codes then
work correctly.
python myansi.py > myansi.txt
type myansi.txt
----------
components: Windows
messages: 365458
nosy: daverove, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Inconsistent ANSI escape code handling on Windows 10
type: behavior
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue40134>
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