錯誤節省matplotlib的數字爲pdf：「STR」對象有沒有屬性「解碼」

Question

我有以下腳本來生成與matplotlib一個數字：

# -*- coding: utf-8 -*- 
import matplotlib.pyplot as plt 
import numpy as np 
import math 

from matplotlib import rc 
rc('font',**{'family':'serif'}) 
rc('text', usetex=True) 
rc('text.latex',unicode=True) 
rc('text.latex',preamble=r'\usepackage[utf8]{inputenc}') 
rc('text.latex',preamble=r'\usepackage[russian]{babel}') 

def figsize(wcm,hcm): plt.figure(figsize=(wcm/2.54,hcm/2.54)) 
figsize(13,9) 

x = np.linspace(0,2*math.pi,100) 
y = np.sin(x) 
plt.plot(x,y,'-') 
plt.xlabel(u"Ось абсцисс") 
plt.show() 

它工作正常，這一數字是正確呈現。但是，當我試圖將其保存爲PDF格式，我得到以下錯誤：

Traceback (most recent call last): 
    File "C:\Path\rus pics\___test_rus.py", line 22, in <module> 
    plt.savefig(u"c:/fig.pdf") 
    File "C:\Python35\lib\site-packages\matplotlib\pyplot.py", line 688, in savefig 
    res = fig.savefig(*args, **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\figure.py", line 1565, in savefig 
    self.canvas.print_figure(*args, **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\backend_bases.py", line 2232, in print_figure 
    **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\backends\backend_pdf.py", line 2536, in print_pdf 
    self.figure.draw(renderer) 
    File "C:\Python35\lib\site-packages\matplotlib\artist.py", line 61, in draw_wrapper 
    draw(artist, renderer, *args, **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\figure.py", line 1159, in draw 
    func(*args) 
    File "C:\Python35\lib\site-packages\matplotlib\artist.py", line 61, in draw_wrapper 
    draw(artist, renderer, *args, **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\axes\_base.py", line 2324, in draw 
    a.draw(renderer) 
    File "C:\Python35\lib\site-packages\matplotlib\artist.py", line 61, in draw_wrapper 
    draw(artist, renderer, *args, **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\axis.py", line 1120, in draw 
    self.label.draw(renderer) 
    File "C:\Python35\lib\site-packages\matplotlib\artist.py", line 61, in draw_wrapper 
    draw(artist, renderer, *args, **kwargs) 
    File "C:\Python35\lib\site-packages\matplotlib\text.py", line 792, in draw 
    mtext=mtext) 
    File "C:\Python35\lib\site-packages\matplotlib\backends\backend_pdf.py", line 1866, in draw_tex 
    psfont = self.tex_font_mapping(dvifont.texname) 
    File "C:\Python35\lib\site-packages\matplotlib\backends\backend_pdf.py", line 1568, in tex_font_mapping 
    return self.tex_font_map[texfont] 
    File "C:\Python35\lib\site-packages\matplotlib\dviread.py", line 701, in __getitem__ 
    result = self._font[texname.decode('ascii')] 
AttributeError: 'str' object has no attribute 'decode' 

只有當我使用標籤西裏爾字母的錯誤出現。

Answer 1

使用XeLaTex原來是一個很好的解決方法。它有它自己的問題（例如，XeLaTex在fill_between的數字上失敗），但它仍允許在標籤中得到西裏爾字母。

# -*- coding: utf-8 -*- 
from __future__ import (absolute_import, division, print_function, unicode_literals) 

import matplotlib as mpl 
mpl.use("pgf") 
pgf_with_custom_preamble = { 
    "font.family": "serif", # use serif/main font for text elements 
    "text.usetex": True, # use inline math for ticks 
    "pgf.rcfonts": False, # don't setup fonts from rc parameters 
    "pgf.preamble": [ 
     "\\usepackage{units}",   # load additional packages 
     "\\usepackage{metalogo}", 
     "\\usepackage{unicode-math}", # unicode math setup 
     r"\setmathfont{xits-math.otf}", 
     r"\setmainfont{DejaVu Serif}", # serif font via preamble 
     ] 
} 
mpl.rcParams.update(pgf_with_custom_preamble) 
import matplotlib.pyplot as plt 
import numpy as np 
import math 

def figsize(wcm,hcm): plt.figure(figsize=(wcm/2.54,hcm/2.54)) 
figsize(13,9) 

x = np.linspace(0,2*math.pi,100) 
y = np.sin(x) 
plt.plot(x,y,'-') 
plt.xlabel(u"Ось абсцисс") 
#plt.show() 

plt.savefig(u"d:/fig.pdf") 

Answer 2

該問題已通過安裝缺少larm1200字體的cm-super軟件包解決。 Matplotlib開發人員，感謝您的幫助！