dutree (python lib/cli) helps quickly find which files/dirs are taking up space. Compare it with a summary of ncdu.
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dutree
.gitignore
LICENSE
README.rst
setup.py

README.rst

dutree :: Disk usage summary

dutree shows a summary of the directories/files which take up the most space.

Instead of showing only the root of the files with sizes, or the details of every file, it shows only the paths taking up the most space.

Example usage:

$ dutree /srv

Annotated output, where only paths of >5% of the total size are shown (which is about 4GB for this dataset):

12.1 G  /srv/data/audiofiles/
         ^-- audiofiles contains files/dirs with a total of 12.1G
             but it does NOT contain a single dir or file larger
             than 4G.
 4.3 G  /srv/data/callrecordings/unmatched/
 4.5 G  /srv/data/fax/
17.5 G  /srv/data/playlists/
34.4 G  /srv/data/twinfield_invoices/1/
 7.8 G  /srv/data/*
          ^-- data contains more files/directories than shown above
              but those that don't total above 4G are merged into
              this "leftover" node. that includes everything in
              /twinfield_invoices/ except for the /1/ subdirectory
              which has its individual listing above.
32   B  /srv/*
          ^-- only /data/ is in /srv/, but the directory itself also
              takes up a tiny bit of space
 -----
80.6 G  TOTAL (86558511658)

NOTE: The directories do not count the size of themselves, only of their contents. This explains any discrepancies with du -sb output.

Library usage:

>>> from dutree import Scanner
>>> scanner = Scanner('/srv')
>>> tree = scanner.scan()
>>> tree.size()
86558511658

>>> len(tree.get_leaves())
7

>>> leaf0 = tree.get_leaves()[0]
>>> leaf0.name()
'/srv/data/audiofiles/'

>>> leaf0.size() / (1024.0 * 1024 * 1024)
12.092280263081193