uLog Analysis in Python (Parameters and Messages)

CHschizo · November 12, 2018, 9:42am

I analyse my ulogs with Python by importing them with px4tools.
I can read the parameters and the messages of PX4 over the comand-line tool pyulog in Ubuntu. But if I would like to get this information directly with Python as well, how could I achieve that? If possible not only in Ubuntu but also on Windows, as I work on both systems.

bkueng · November 12, 2018, 6:44pm

Hi

Please have a look at how the scripts are doing it, you can do the same thing in python directly:

github.com

PX4/pyulog/blob/master/pyulog/messages.py

#! /usr/bin/env python
"""
Display logged messages from an ULog file
"""

from __future__ import print_function

import argparse

from .core import ULog
#pylint: disable=invalid-name

def main():
    """Commande line interface"""

    parser = argparse.ArgumentParser(description='Display logged messages from an ULog file')
    parser.add_argument('filename', metavar='file.ulg', help='ULog input file')


    args = parser.parse_args()

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github.com

PX4/pyulog/blob/master/pyulog/params.py

#! /usr/bin/env python
"""
Extract parameters from an ULog file
"""

from __future__ import print_function

import argparse
import sys

from .core import ULog
#pylint: disable=unused-variable, too-many-branches

def main():
    """Commande line interface"""

    parser = argparse.ArgumentParser(description='Extract parameters from an ULog file')
    parser.add_argument('filename', metavar='file.ulg', help='ULog input file')

    parser.add_argument('-d', '--delimiter', dest='delimiter', action='store',

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CHschizo · November 12, 2018, 8:44pm

That is exactly what I was looking for. Thanks a lot

DRUMKC · June 27, 2019, 3:09am

I try using this parser and keep getting this message:

SyntaxError: from future imports must occur at the beginning of the file

Does anyone know what the problem could be?

bkueng · July 10, 2019, 9:56am

Hi @DRUMKC

The error message tells you already: the future import must be moved to the top of the file.