Add Python file

Ensure that CR stripped file is uploaded without CRs that might have crept in if doing a mod.

Other issues like exception handling appear resolved

Author: TheKitty

PyPortal_ViewMaster/code.py

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+import os
+import board
+import busio
+import digitalio
+import storage
+import adafruit_sdcard
+from adafruit_slideshow import PlayBackOrder, SlideShow, PlayBackDirection
+
+# Default location to look is in internal memory
+IMAGE_DIRECTORY = "/images"
+
+switch = digitalio.DigitalInOut(board.D3)
+switch.direction = digitalio.Direction.INPUT
+switch.pull = digitalio.Pull.UP
+
+spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
+cs = digitalio.DigitalInOut(board.SD_CS)
+try:
+    sdcard = adafruit_sdcard.SDCard(spi, cs)
+    vfs = storage.VfsFat(sdcard)
+    storage.mount(vfs, "/sd")
+    IMAGE_DIRECTORY = "/sd/images"
+except OSError as error:
+    print("No SD card, will only look on internal memory")
+
+def print_directory(path, tabs=0):
+    for file in os.listdir(path):
+        stats = os.stat(path + "/" + file)
+        filesize = stats[6]
+        isdir = stats[0] & 0x4000
+
+        if filesize < 1000:
+            sizestr = str(filesize) + " by"
+        elif filesize < 1000000:
+            sizestr = "%0.1f KB" % (filesize / 1000)
+        else:
+            sizestr = "%0.1f MB" % (filesize / 1000000)
+
+        prettyprintname = ""
+        for _ in range(tabs):
+            prettyprintname += "   "
+        prettyprintname += file
+        if isdir:
+            prettyprintname += "/"
+        print('{0:<20} Size: {1:>6}'.format(prettyprintname, sizestr))
+
+        # recursively print directory contents
+        if isdir:
+            print_directory(path + "/" + file, tabs + 1)
+
+try:
+    print_directory(IMAGE_DIRECTORY)
+except OSError as error:
+    raise Exception("No images found on flash or SD Card")
+
+# Create the slideshow object that plays through once alphabetically.
+slideshow = SlideShow(board.DISPLAY, None, folder=IMAGE_DIRECTORY, loop=True,
+                      order=PlayBackOrder.ALPHABETICAL, dwell=0)
+while True:
+    if not switch.value:
+        print("Click!")
+        slideshow.direction = PlayBackDirection.FORWARD
+        slideshow.advance()
+        while not switch.value:
+            pass