The python gcore message() function does not work in 7.4.2

[micha]

Printing messages (warning, error, info) in a python script using GRASS 7.4.2 gives no output.

GRASS 7.4.2 (ITM):~ > ipython2
Python 2.7.12 (default, Dec  4 2017, 14:50:18)
Type "copyright", "credits" or "license" for more information.

IPython 5.1.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.
 In [1]: import grass.script as gs
 In [2]: gs.message("Hello")
 In [3]: gs.warning("Hello")
 In [4]: print("Hello")
 Hello

[NikosA]

Same here for GRASS GIS 7.4.3svn (r73647). Works for trunk, GRASS GIS 7.7.svn (r73645M).

[martinl]

Right, only G74 seems to be affected. Works also in G76.

[martinl]

Comparing G74 and G76, this could play a role since messages are printed to stderr.

-_capture_stderr = True  # capture stderr of subprocesses if possible
+_capture_stderr = False  # capture stderr of subprocesses if possible

[martinl]

Right, after changing

_capture_stderr = True

to

_capture_stderr = False

message is printed out.

[martinl]

Seems to be introduced in r73240

[martinl]

Apparently r73269 hasn't been backported to G74 branch...

[martinl]

In 73651:

libpython: revert r73238, fixes #3692

[neteler]

I guess this warrants a new release? :(

[martinl]

Right, what about releasing GRASS 7.4.3 soon (within weeks) with just one RC?

[mmetz]

Replying to martinl:

Right, what about releasing GRASS 7.4.3 soon (within weeks) with just one RC?

That was partially my fault, even though r73240 was authored by neteler, sorry for the trouble! It was an attempt to capture standard error from python multiprocessing, but we found another solution.

+1 for releasing GRASS 7.4.3 soon, also because of an important bug fix in r.external.