Conga line formed out of all available fonts in Pythonista.

fontCongaLine.py

import scene, os

colorLightBlue = scene.Color(.3, .3, 1)
colorWhite     = scene.Color( 1,  1, 1)

fontBlackList = ('AcademyEngraved', 'AppleColorEmoji@2x',
                 'ArialHB', 'Bodoni72', 'ChalkboardSE',
                 'CourierNew', 'DB_LCD_Temp-Black',
                 'EuphemiaCAS', 'Fallback', 'HoeflerText',
                 'LastResort', 'KGPW3UI', 'LockClock',
                 'PartyLET', 'PhoneKeyCaps', 'ZapfDingbats')

def getFontFunction():  # Don't call this directly...
    fileNames = []
    for fileName in os.listdir('/System/Library/Fonts/Cache'): #'../Pythonista.app'):
        if (fileName.endswith('.ttc')
         or fileName.endswith('.ttf')):
            fileName = fileName.rpartition('.tt')[0]
            if fileName.startswith('_H_'):
                fileName = fileName.partition('_H_')[2]
            if (fileName not in fontBlackList
            and 'Bold' not in fileName
            and 'Neue' not in fileName
            and 'Next' not in fileName
            and 'Light' not in fileName
            and 'Bodoni' not in fileName
            and 'Italic' not in fileName
            and 'Medium' not in fileName
            and 'OldStyle' not in fileName
            and 'Condensed' not in fileName
            and 'Old-Style' not in fileName
            and 'MarkerFelt' not in fileName):
                fileNames.append(fileName.partition('New')[0])
    for fileName in sorted(fileNames):
        yield fileName
getFontName = getFontFunction()  # Call getFontName.next()

class FontSampleLayer(scene.Layer):
    def __init__(self, inFontName = 'Helvetica'):
        (imageName, imageSize) = scene.render_text(inFontName,
                           font_name=inFontName, font_size=64)
        theRect = scene.Rect(0, 0, imageSize.w, imageSize.h)
        super(self.__class__, self).__init__(theRect)
        self.tint = colorLightBlue
        # self.background = colorWhite  # useful for debugging
        self.image = imageName
        self.dx = 1
        self.dy = 1

    def move(self):
        self.frame.x += self.dx
        self.frame.y += self.dy
        sup = self.superlayer.frame
        if self.frame.x <= sup.x or (
           self.frame.x + self.frame.w >= sup.x + sup.w):
            self.dx = -self.dx           # change x direction
            self.frame.x += self.dx * 2  #  with a little hop
        if self.frame.y <= sup.y or (
           self.frame.y + self.frame.h >= sup.y + sup.h):
            self.dy = -self.dy           # change y direction
            self.frame.y += self.dy * 2  #  with a little hop

class FontSampleView(scene.Scene):
    def setup(self):
        self.frameCount = -1
        
    def draw(self):
        self.frameCount += 1
        if self.frameCount % 80 == 0:
            try:
                fontName = getFontName.next()
                print(fontName)
                self.add_layer(FontSampleLayer(fontName))
            except StopIteration:
                pass
        scene.background(0, 0, 0)
        self.root_layer.update(self.dt)
        self.root_layer.draw()
        for theLayer in self.root_layer.sublayers:
            if isinstance(theLayer, FontSampleLayer):
                theLayer.move()

if __name__ == "__main__":
    print('=' * 20)
    scene.run(FontSampleView())