import matplotlib
import matplotlib.font_manager as font_manager
import glob

the_files = font_manager.findSystemFonts(fontpaths=None)
# Using the_files = font_manager.OSXInstalledFonts() produces the same results
for font_name in ['Open Sans', 'Lucida Grande', 'Avenir', 'Arial']:
    print('')
    print('** ' + font_name)
    print("Names reported by font_manager for fonts in font_manager-found files with '" + font_name + "' in file name:")
    for the_file in the_files:
        if font_name.replace(' ', '').lower() in the_file.replace(' ', '').lower():
            the_props = font_manager.FontProperties(fname=the_file)
            print "\t" + the_props.get_name(), 
            print '\t\t', the_props._file

    print('')
    font_in_file_name = font_name.replace(' ', '')
    print("Files found through file system with '" + font_in_file_name + "' in file name:")
    for font_dir in ['/Users/olga/Library/Fonts/', '/Library/Fonts/', '/System/Library/Fonts/']:
        for file in glob.glob(font_dir + font_in_file_name + '*.*'):
            print("\t" + file)

font = {'family': 'sans-serif',
       'sans-serif': ['Open Sans', 'Lucida Grande', 'Avenir', 'Arial', 'sans-serif']}
matplotlib.rc('font', **font)
plt.plot((0,1), (0,1))