Matplotlib 在导入时占用时间

我刚刚升级到 matplotlib(1.5.1)的最新稳定版本，每次导入 matplotlib 都会收到这样的消息:

/usr/local/lib/python2.7/dist-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')

总是会停几秒钟。

这是预期的行为吗? 以前也是这样，只是没有打印出来的信息？

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最佳答案

As tom suggested in the comment above, deleting the files: 

fontList.cache
fontList.py3k.cache
tex.cache

solve the problem. In my case the files were under:

`~/.matplotlib`

EDITED

A couple of days ago the message appeared again, I deleted the files in the locations mention above without any success. I found that as suggested here by T Mudau there's an extra location with text cache files is: ~/.cache/fontconfig

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On OSX Yosemite (version 10.10.15), the following worked for me:

  • remove the cache files from this directory as well: ~/.cache/fontconfig (as per tom's suggestion)
    rm -rvf ~/.cache/fontconfig/*
  • also removed .cache files in ~/.matplotlib (as per Hugo's suggestion)
    rm -rvf ~/.matplotlib/*
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I ran the python code w. sudo and it cured it...my guess was that there wasn't permission to write that table... good luck!

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I ran the python code using sudo just once, and it resolved the warning for me. Now it runs faster. Running without sudo gives no warning at all.

Cheers

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This worked for me:

sudo apt-get install libfreetype6-dev libxft-dev
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Confirmed Hugo's approach works for Ubuntu 14.04 LTS/matplotlib 1.5.1:

  • deleted ~/.cache/matplotlib/fontList.cache
  • ran code, again the warning was issued (assumption: is rebuilding the cache correctly)
  • ran code again, no more warning (finally)
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HI you must find this file : font_manager.py in my case : C:\Users\gustavo\Anaconda3\Lib\site-packages\matplotlib\ font_manager.py

and FIND def win32InstalledFonts(directory=None, fontext='ttf') and replace by :

def win32InstalledFonts(directory=None, fontext='ttf'): """ Search for fonts in the specified font directory, or use the system directories if none given. A list of TrueType font filenames are returned by default, or AFM fonts if fontext == 'afm'. """

from six.moves import winreg
if directory is None:
directory = win32FontDirectory()


fontext = get_fontext_synonyms(fontext)


key, items = None, {}
for fontdir in MSFontDirectories:
try:
local = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, fontdir)
except OSError:
continue


if not local:
return list_fonts(directory, fontext)
try:
for j in range(winreg.QueryInfoKey(local)[1]):
try:
key, direc, any = winreg.EnumValue(local, j)
if not is_string_like(direc):
continue
if not os.path.dirname(direc):
direc = os.path.join(directory, direc)
direc = direc.split('\0', 1)[0]


if os.path.splitext(direc)[1][1:] in fontext:
items[direc] = 1
except EnvironmentError:
continue
except WindowsError:
continue
except MemoryError:
continue
return list(six.iterkeys(items))
finally:
winreg.CloseKey(local)
return None
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This worked for me on Ubuntu 16.04 LST with Python 3.5.2 | Anaconda 4.2.0 (64-bit). I deleted all of the files in ~/.cache/matplotlib/.

sudo rm -r fontList.py3k.cache tex.cache

At first I thought it wouldn't work, because I got the warning afterward. But after the cache files were rebuilt the warning went away. So, close your file, and reopen again(open again), it has no warning.


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