Goes through all open fonts to find out if the font uses a component. Useful to run if you're thinking of changing the spacing of a accent and you don't want everything to go all wonky.

find_if_font_uses_component.py

from robofab.world import AllFonts

fonts = AllFonts()

for font in fonts:
    print font.info.postscriptFullName
    for glyph in font:
        if len(glyph.components) != 0:
            for c in glyph.components:
                if c.baseGlyph == 'uni0361':
                    print 'uni0361 in ' + glyph.name
                    continue
print 'done'