Tag: python

matplotlib font not found

When you add new fonts to your system, you need to delete your fontList.cache file in order for matplotlib to find them.

The file fontList.cache is located at your Userfolder –> .matplotlib/fontList.cache or ~/.cache/matplotlib/fontList.cache, for Windows that would normally be C:\Users\yourUsername\.matplotlib\fontList.cache

matplotlib.font_manager
matplotlib.font_manager._rebuild()

References
https://stackoverflow.com/questions/26085867/matplotlib-font-not-found
http://andresabino.com/2015/08/18/fonts-and-matplotlib/
https://stackoverflow.com/questions/45877746/changing-fonts-in-matplotlib

Convert UTC time to local in Python

UTC to local:

EPOCH_DATETIME = datetime.datetime(1970,1,1)
SECONDS_PER_DAY = 24*60*60

def utc_to_local_datetime( utc_datetime ):
    delta = utc_datetime - EPOCH_DATETIME
    utc_epoch = SECONDS_PER_DAY * delta.days + delta.seconds
    time_struct = time.localtime( utc_epoch )
    dt_args = time_struct[:6] + (delta.microseconds,)
    return datetime.datetime( *dt_args )

UTC to local:

>>> import datetime, pytz
>>> local_tz = pytz.timezone('Asia/Tokyo')
>>> datetime.datetime.now().replace(tzinfo=pytz.utc).astimezone(local_tz)
datetime.datetime(2011, 3, 4, 16, 2, 3, 311670, tzinfo=<DstTzInfo 'Asia/Tokyo' JST+9:00:00 STD>)

local to UTC:

>>> import datetime, pytz
>>> datetime.datetime.now()
datetime.datetime(2011, 3, 4, 15, 6, 6, 446583)
>>> datetime.datetime.now(pytz.utc)
datetime.datetime(2011, 3, 4, 7, 6, 22, 198472, tzinfo=<UTC>)

References
https://k4ml.wordpress.com/2011/03/04/convert-utc-time-to-local/
https://stackoverflow.com/questions/4563272/convert-a-python-utc-datetime-to-a-local-datetime-using-only-python-standard-lib

Persian Text in Matplolib

from bidi.algorithm import get_display
import arabic_reshaper
def make_farsi_text(x):
reshaped_text = arabic_reshaper.reshape(x)
farsi_text = get_display(reshaped_text)
return farsi_text
xlabel = "یک محور همینجوری"
ylabel = "یک محور دیگه همینجوری"
title = "یک نمودار همینجوری"
 
 
plt.scatter(X[:,0],X[:,1],c = y, cmap = 'spring')
plt.xlabel(make_farsi_text(xlabel),fontsize = 15)
plt.ylabel(make_farsi_text(ylabel),fontsize = 15)
plt.title(make_farsi_text(title) , fontsize = 20)
plt.show()
font_title = {'family': 'B Farnaz',
'color':  'red',
'weight': 'normal',
'size': 30,
}
font_labels = {'family': 'B Nazanin',
'color':  'black',
'weight': 'normal',
'size': 20,
}
 
plt.scatter(X[:,0],X[:,1],c = y, cmap = 'spring')
plt.xlabel(make_farsi_text(xlabel),fontdict = font_labels)
plt.ylabel(make_farsi_text(ylabel),fontdict = font_labels)
plt.title(make_farsi_text(title) ,fontdict = font_title)
plt.show()

References
http://imuhammad.ir/2017/09/23/farsi-plots-python/
https://pypi.org/project/python-bidi/
https://github.com/mpcabd/python-arabic-reshaper