Here is the whole traceback: Traceback (most recent call last): File "./merger-tree.py", line 27, in <module> mt.build_tree(i) File "/home/xllian/.local/lib/python3.6/site-packages/yt/analysis_modules/halo_analysis/enzofof_merger_tree.py", line 404, in build_tree max_children)] File "/home/xllian/.local/lib/python3.6/site-packages/yt/analysis_modules/halo_analysis/enzofof_merger_tree.py", line 229, in __init__ sorted_keys = sorted(tree.relationships[output_num][halo_id].keys()) TypeError: '<' not supported between instances of 'str' and 'int' Thank you for your reply!

We are mostly on US time, so I doubt anyone has had a chance to look since you replied to my question last night. It’s not immediately obvious what the problem is just from looking at the traceback or your script. Somehow ints and strings are being mixed as the keys to a dict. This is a problem when we try to sort the keys, since comparisons aren’t allowed between those two types in Python3. Is there any chance you can reproduce this issue using one of the public test datasets at yt-project.org/data? If so, please reply with a copy of the full test script that one of us can copy/paste and run locally. That will make it easier for one of us to debug the issue you’ve run into on our local system. Failing that you can share one of your datasets using the “yt upload” command line tool. Just create a tarball containing a dataset, do “yt upload file.tar.gz”, and then share the link that prints out when the upload finishes. This requires sharing the data publicly, so if you’re not comfortable with that don’t do it. Best, Nathan On Thu, May 10, 2018 at 8:00 AM wrote:

Did you find out what is wrong about this, I tried to find out the difference of .key() in python2 and python3, but it doesn't work well eight. _______________________________________________ yt-users mailing list -- yt-users@python.org To unsubscribe send an email to yt-users-leave@python.org

I tried my code using the public dataset in yt named "Enzo_64" downloaded from yt web. And I got the same error like: Traceback (most recent call last): File "./merger-tree.py", line 27, in <module> mt.build_tree(i) File "/mnt/ddnfs/data_users/xllian/software/yt/yt/analysis_modules/halo_analysis/enzofof_merger_tree.py", line 404, in build_tree max_children)] File "/mnt/ddnfs/data_users/xllian/software/yt/yt/analysis_modules/halo_analysis/enzofof_merger_tree.py", line 229, in __init__ sorted_keys = sorted(tree.relationships[output_num][halo_id].keys()) TypeError: '<' not supported between instances of 'str' and 'int' And my code is like: #!/usr/bin/env python3 import yt import matplotlib.pyplot as plt from yt.analysis_modules.halo_analysis.api import HaloCatalog from yt.data_objects.particle_filters import add_particle_filter from yt.analysis_modules.halo_finding.halo_objects import FOFHaloFinder from yt.analysis_modules.halo_analysis.enzofof_merger_tree import EnzoFOFMergerTree from yt.analysis_modules.halo_analysis.enzofof_merger_tree import find_halo_relationships from yt.analysis_modules.halo_analysis.enzofof_merger_tree import grab_FOF_halo_info_internal from yt.analysis_modules.halo_analysis.enzofof_merger_tree import plot_halo_evolution ts = yt.load('DD00??/data00??') for ds in ts: halo_list = FOFHaloFinder(ds, link=0.16, dm_only=False, ptype="all") i = int(ds.basename[4:]) halo_list.write_out("FOF/groups_%05i.txt" % i) halo_list.write_particle_lists("FOF/particles_%05i" % i) mt = EnzoFOFMergerTree(external_FOF = False) for i in range(20): mt.build_tree(i) mt.save_halo_evolution("halos.h5") for i in range(20): plot_halo_evolution("halos.h5",i) plt.savefig("%d.png" % i)

I reinstall my yt in your method, all the steps can work well except the one "git checkout enzo-fof-fix". And the error message is -- error: pathspec 'enzo-fof-fix' did not match any file(s) known to git. Then I just change this command like"git checkout .", and all the install can be finished. But I receive the same error as before when running my script. I have no ideal what's wrong with your method.