how can i use utf-8 or just how can i plot the datetime in local settings ?

Alexey_Uimanov · August 1, 2011, 4:23am

Here the code

#!/usr/bin/env python

from pylab import figure, show
from matplotlib.dates import AutoDateLocator, AutoDateFormatter,
drange, DateFormatter
import datetime
import random

dates = drange(datetime.datetime(2010, 1, 1), datetime.datetime(2010,
12,31), datetime.timedelta(days = 1))
opens = map(lambda a: random.random(), dates)

fig = figure()
ax = fig.add_subplot(111)
ax.plot_date(dates, opens, '-')

majloc = AutoDateLocator()
majform = AutoDateFormatter(majloc)

ax.xaxis.set_major_locator(majloc)
ax.xaxis.set_major_formatter(majform)
ax.autoscale_view()
ax.grid(True)
fig.autofmt_xdate()
show()

It is just the same code as date_demo1.py from examples directory with
some modifications
My current locale is ru_RU.UTF-8 and i want plot the date ruller along
X axis in format of my locale, with russian names of months.
I can not do this because of this error when printing the chart

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtk.py",
line 394, in expose_event
    self._render_figure(self._pixmap, w, h)
  File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
    FigureCanvasAgg.draw(self)
  File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 394, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line
55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/matplotlib/figure.py", line
798, in draw
    func(*args)
  File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line
55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/matplotlib/axes.py", line 1946, in draw
    a.draw(renderer)
  File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line
55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/matplotlib/axis.py", line 971, in draw
    tick_tups = [ t for t in self.iter_ticks()]
  File "/usr/lib/python2.7/site-packages/matplotlib/axis.py", line
907, in iter_ticks
    majorLabels = [self.major.formatter(val, i) for i, val in
enumerate(majorLocs)]
  File "/usr/lib/python2.7/site-packages/matplotlib/dates.py", line
486, in __call__
    return self._formatter(x, pos)
  File "/usr/lib/python2.7/site-packages/matplotlib/dates.py", line
336, in __call__
    return self.strftime(dt, self.fmt)
  File "/usr/lib/python2.7/site-packages/matplotlib/dates.py", line
362, in strftime
    return cbook.unicode_safe(dt.strftime(fmt))
  File "/usr/lib/python2.7/site-packages/matplotlib/cbook.py", line
41, in unicode_safe
    else: return unicode(s, preferredencoding)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position
0: ordinal not in range(128)

When lauching this with LANG=C everythig works but datetime prints in
english locale.
Version of matplotlib is 1.0.1
What am i doing wrong ?

Michael_Droettboom1 · August 1, 2011, 2:59pm

This is a bug in that matplotlib is not reading the preferred encoding correctly, because doing so has undesired side effects in some cases. An easy workaround is to add the following to the top of your script (before importing matplotlib):

import locale
locale.setlocale(locale.LC_ALL, '')

Note, you will also need to select a font that has Cyrillic characters. The default font shipped with matplotlib "Vera Sans" does not, but you can use its more-Unicode-complete sibling "DejaVu Sans" (installed on most Linux systems by default).

Interestingly, another use had a similar problem quite recently. The following branch of matplotlib may also fix your problem:

https://github.com/mdboom/matplotlib/tree/locale_formatting

To test this, you would need to build it from source, and then set the rcParam "axes.formatter.use_locale" to True.

Cheers,
Mike

···

On 08/01/2011 12:23 AM, Alexey Uimanov wrote:

Here the code
#!/usr/bin/env python

from pylab import figure, show
from matplotlib.dates import AutoDateLocator, AutoDateFormatter,
drange, DateFormatter
import datetime
import random

dates = drange(datetime.datetime(2010, 1, 1), datetime.datetime(2010,
12,31), datetime.timedelta(days = 1))
opens = map(lambda a: random.random(), dates)

fig = figure()
ax = fig.add_subplot(111)
ax.plot_date(dates, opens, '-')

majloc = AutoDateLocator()
majform = AutoDateFormatter(majloc)

ax.xaxis.set_major_locator(majloc)
ax.xaxis.set_major_formatter(majform)
ax.autoscale_view()
ax.grid(True)
fig.autofmt_xdate()
show()
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
It is just the same code as date_demo1.py from examples directory with
some modifications
My current locale is ru_RU.UTF-8 and i want plot the date ruller along
X axis in format of my locale, with russian names of months.
I can not do this because of this error when printing the chart
Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtk.py",
line 394, in expose_event
     self._render_figure(self._pixmap, w, h)
   File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
     FigureCanvasAgg.draw(self)
   File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 394, in draw
     self.figure.draw(self.renderer)
   File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line
55, in draw_wrapper
     draw(artist, renderer, *args, **kwargs)
   File "/usr/lib/python2.7/site-packages/matplotlib/figure.py", line
798, in draw
     func(*args)
   File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line
55, in draw_wrapper
     draw(artist, renderer, *args, **kwargs)
   File "/usr/lib/python2.7/site-packages/matplotlib/axes.py", line 1946, in draw
     a.draw(renderer)
   File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line
55, in draw_wrapper
     draw(artist, renderer, *args, **kwargs)
   File "/usr/lib/python2.7/site-packages/matplotlib/axis.py", line 971, in draw
     tick_tups = [ t for t in self.iter_ticks()]
   File "/usr/lib/python2.7/site-packages/matplotlib/axis.py", line
907, in iter_ticks
     majorLabels = [self.major.formatter(val, i) for i, val in
enumerate(majorLocs)]
   File "/usr/lib/python2.7/site-packages/matplotlib/dates.py", line
486, in __call__
     return self._formatter(x, pos)
   File "/usr/lib/python2.7/site-packages/matplotlib/dates.py", line
336, in __call__
     return self.strftime(dt, self.fmt)
   File "/usr/lib/python2.7/site-packages/matplotlib/dates.py", line
362, in strftime
     return cbook.unicode_safe(dt.strftime(fmt))
   File "/usr/lib/python2.7/site-packages/matplotlib/cbook.py", line
41, in unicode_safe
     else: return unicode(s, preferredencoding)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position
0: ordinal not in range(128)
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
When lauching this with LANG=C everythig works but datetime prints in
english locale.
Version of matplotlib is 1.0.1
What am i doing wrong ?

------------------------------------------------------------------------------
Got Input? Slashdot Needs You.
Take our quick survey online. Come on, we don't ask for help often.
Plus, you'll get a chance to win $100 to spend on ThinkGeek.
http://p.sf.net/sfu/slashdot-survey
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
matplotlib-users List Signup and Options

--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA