python - Non-ASCII characters in Matplotlib -

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i have problem displaying non-ascii characters in matplotlib, these characters rendered small boxes instead of proper font, looks (i filled these boxes red paint hightlight them):

here image showing problem

how fix it?

a related question accented characters in matplotlib.

this problem may have couple of different causes:

the default font not include these glyphs

you may change default font using following (before plotting done!)

  matplotlib.rc('font', family='arial')

in versions of matplotlib you'll have te set family: 

  matplotlib.rc('font', **{'sans-serif' : 'arial',                            'family' : 'sans-serif'})

(note because sans-serif contains hyphen inside **{} syntax, necessary.)

the first command changes sans-serif font family contain 1 font (in case arial), second sets default font family sans-serif.

other options included in documentation.

you have improperly created/passsed string objects matplotlib

even if font contains proper glyphs, if forgot use u create unicode constants, matplotlib have behaviour:

  plt.xlabel("Średnia odległość między stacjami wsparcia modelowaną [km]")

so need add u:

  plt.xlabel(u"Średnia odległość między stacjami wsparcia modelowaną [km]")

another cause forgot put utf-8 magic comment on top of file (i read might source of problem):

 # -*- coding: utf-8 -*-

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