python parse_command

 Dear list,
I am struggling with my python code.
I am trying to get the computational region of a xyz-file. If I use
r.in.xyz in GRASS itself, it works all just fine, but using it in python
I always get an error.
Here is my code:

    from grass_session import Session
    from grass.script import core as gcore
    from grass.pygrass.modules.shortcuts import general as g
    from grass.pygrass.modules.shortcuts import raster as r

    with Session(gisdb="/home/jreith/grassdata",
    location="nrw",mapset="elevation", create_opts="EPSG:4326"):
    compregion = gcore.parse_command('r.in_xyz',
    input="/geodaten/dgm1.xyz", flags='s',
    output="new_file",separator='space')


The error:

    Traceback (most recent call last):
      File "grass_scripts/grass_dem.py", line 32, in <module>
        compregion = gcore.parse_command('r.in_xyz',
    input="/geodaten/dgm1.xyz", flags='s',
    output="new_file",separator='space')
      File
    "/home/jreith/source/grass-7.4.svn/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.py",
    line 516, in parse_command
        res = read_command(*args, **kwargs)
      File
    "/home/jreith/source/grass-7.4.svn/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.py",
    line 471, in read_command
        process = pipe_command(*args, **kwargs)
      File
    "/home/jreith/source/grass-7.4.svn/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.py",
    line 444, in pipe_command
        return start_command(*args, **kwargs)
      File
    "/home/jreith/source/grass-7.4.svn/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.py",
    line 380, in start_command
        return Popen(args, **popts)
      File
    "/home/jreith/source/grass-7.4.svn/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.py",
    line 74, in __init__
        subprocess.Popen.__init__(self, args, **kwargs)
      File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
        errread, errwrite)
      File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child
        raise child_exception
    OSError: [Errno 2] No such file or directory

I appreciate any help and hope I made myself clear.

best regards
Jonathan

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