On Thu, Oct 18, 2018 at 1:49 PM drdavella ***@***.***> wrote: Bug report *Bug summary* When importing matplotlib.pyplot, the interpreter hangs indefinitely. This only seems to happen in an environment where $HOME/.matplotlib does not yet exist. I reproduced this in my environment by renaming the existing $HOME/.matplotlib directory. Critically, this only seems to occur when running the script from $HOME. A valid workaround seems to be to move to any other directory and run the same command. After this, a new .matplotlib/ directory now exists in $HOME, and the previous command works fine when running from $HOME. In order to reproduce this I created a conda environment with the following command: $ conda create -n mpl-test python ipython matplotlib Everything came from the default channel. *Code for reproduction* from matplotlib import pytplot as plt *Actual outcome* This hangs indefinitely. When I hit CTRL-C, I get something like the following: ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/pyplot.py in <module> 30 from cycler import cycler 31 import matplotlib ---> 32 import matplotlib.colorbar 33 import matplotlib.image 34 from matplotlib import rcsetup, style ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/colorbar.py in <module> 30 import matplotlib.collections as collections 31 import matplotlib.colors as colors ---> 32 import matplotlib.contour as contour 33 import matplotlib.cm as cm 34 import matplotlib.gridspec as gridspec ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/contour.py in <module> 16 import matplotlib.colors as mcolors 17 import matplotlib.collections as mcoll ---> 18 import matplotlib.font_manager as font_manager 19 import matplotlib.text as text 20 import matplotlib.cbook as cbook ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in <module> 1361 raise 1362 except Exception: -> 1363 _rebuild() 1364 else: 1365 _rebuild() ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in _rebuild() 1342 global fontManager 1343 -> 1344 fontManager = FontManager() 1345 1346 if _fmcache: ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in __init__(self, size, weight) 976 self.defaultFont = {} 977 --> 978 ttffiles = findSystemFonts(paths) + findSystemFonts() 979 self.defaultFont['ttf'] = next( 980 (fname for fname in ttffiles ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in findSystemFonts(fontpaths, fontext) 268 # check for OS X & load its fonts if present 269 if sys.platform == 'darwin': --> 270 fontfiles.update(OSXInstalledFonts(fontext=fontext)) 271 272 elif isinstance(fontpaths, str): ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in OSXInstalledFonts(directories, fontext) 216 directories = OSXFontDirectories 217 return [path --> 218 for directory in directories 219 for ext in get_fontext_synonyms(fontext) 220 for path in list_fonts(directory, ext)] ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in <listcomp>(.0) 218 for directory in directories 219 for ext in get_fontext_synonyms(fontext) --> 220 for path in list_fonts(directory, ext)] 221 222 ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in list_fonts(directory, extensions) 155 extensions = ["." + ext for ext in extensions] 156 return [str(path) --> 157 for path in filter(Path.is_file, Path(directory).glob("**/*.*")) 158 if path.suffix in extensions] 159 ~/miniconda3/envs/mpl-test/lib/python3.7/site-packages/matplotlib/font_manager.py in <listcomp>(.0) 154 """ 155 extensions = ["." + ext for ext in extensions] --> 156 return [str(path) 157 for path in filter(Path.is_file, Path(directory).glob("**/*.*")) 158 if path.suffix in extensions] ~/miniconda3/envs/mpl-test/lib/python3.7/pathlib.py in glob(self, pattern) 1080 raise NotImplementedError("Non-relative patterns are unsupported") 1081 selector = _make_selector(tuple(pattern_parts)) -> 1082 for p in selector.select_from(self): 1083 yield p 1084 ~/miniconda3/envs/mpl-test/lib/python3.7/pathlib.py in _select_from(self, parent_path, is_dir, exists, scandir) 543 for starting_point in self._iterate_directories(parent_path, is_dir, scandir): 544 for p in successor_select(starting_point, is_dir, exists, scandir): --> 545 if p not in yielded: 546 yield p 547 yielded.add(p) ~/miniconda3/envs/mpl-test/lib/python3.7/pathlib.py in __hash__(self) 724 return self._hash 725 except AttributeError: --> 726 self._hash = hash(tuple(self._cparts)) 727 return self._hash 728 ~/miniconda3/envs/mpl-test/lib/python3.7/pathlib.py in _cparts(self) 710 # Cached casefolded parts, for hashing and comparison 711 try: --> 712 return self._cached_cparts 713 except AttributeError: 714 self._cached_cparts = self._flavour.casefold_parts(self._parts) KeyboardInterrupt: *Expected outcome* It shouldn't hang! 😝 *Matplotlib version* - Operating system: OSX 10.12.6 (High Sierra) - Matplotlib version: 3.0.0 - Matplotlib backend (print(matplotlib.get_backend())): This command hangs also, but after performing the workaround I get 'TkAgg' - Python version: 3.7.0, but we initially saw this on 3.6.6. - Jupyter version (if applicable): N/A - Other libraries: The only other thing installed in this environment is IPython cc @brechmos-stsci <https://github.com/brechmos-stsci> who initially encountered this issue and discovered the workaround. — You are receiving this because you are subscribed to this thread. 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