mplotqueries with --group-limit throws error in Python 3.x

[chrisbenseler]

When trying to use mplotqueries and group-limit, the output is an error

The command:
mplotqueries /var/log/mongodb/mongod.log --output-file mongodb.png --group-limit 10

The output:
File "/home/azbvlab/mongodbanalyzer/venv/lib/python3.6/site-packages/mtools/util/grouping.py", line 120, in sort_by_size
group_keys = self.groups.keys()[group_limit - 1:]
TypeError: 'odict_keys' object is not subscriptable

I cannot reproduce this error in my local environment, only with the log file created by the mongodb in an Ubuntu instance I run on Azure. MongoDB is on 3,4,16, Python is 3.6
Other mtools commands work fine, the problem is when I try to limit the mplotqueries.

[stennie]

@chrisbenseler To help reproduce this issue can you please provide:

• a snippet of log lines that results in the error
• the output of mplotqueries --version in the environment that has the error as well as your local environment

I suspect the error is related to the Python version rather than the MongoDB server version, but since you have working and non-working environments it would be useful to confirm any obvious differences.

Thanks,
Stennie

[stennie]

@chrisbenseler As suspected this looks like a straightforward compatibility issue with Python 3, but any extra info would still be helpful to confirm.

Regards,
Stennie

[chrisbenseler]

Hi @stennie

mplotqueries --version outputs:

mtools version 1.5.3 || Python 3.6.7 (default, Oct 22 2018, 11:32:17) [GCC 8.2.0]

The error in the console is this one, it does not show the log lines with the problem. If needed, I can attach the complete log file.

Traceback (most recent call last):
File "/home/azbvlab/mongodbanalyzer/venv/bin/mplotqueries", line 11, in
load_entry_point('mtools==1.5.3', 'console_scripts', 'mplotqueries')()
File "/home/azbvlab/mongodbanalyzer/venv/lib/python3.6/site-packages/mtools/mplotqueries/mplotqueries.py", line 681, in main
tool.run()
File "/home/azbvlab/mongodbanalyzer/venv/lib/python3.6/site-packages/mtools/mplotqueries/mplotqueries.py", line 130, in run
self.group()
File "/home/azbvlab/mongodbanalyzer/venv/lib/python3.6/site-packages/mtools/mplotqueries/mplotqueries.py", line 254, in group
plot_inst.group()
File "/home/azbvlab/mongodbanalyzer/venv/lib/python3.6/site-packages/mtools/mplotqueries/plottypes/base_type.py", line 91, in group
discard_others=self.args['no_others'])
File "/home/azbvlab/mongodbanalyzer/venv/lib/python3.6/site-packages/mtools/util/grouping.py", line 120, in sort_by_size
group_keys = self.groups.keys()[group_limit - 1:]
TypeError: 'odict_keys' object is not subscriptable