Move update_self out of __main__ for clarity

youtube-dl

@@ -2698,20 +2698,15 @@ class FFmpegExtractAudioPP(PostProcessor):
 		information['filepath'] = new_path
 		return information
 
-### MAIN PROGRAM ###
-if __name__ == '__main__':
-	try:
-		# Modules needed only when running the main program
-		import getpass
-		import optparse
 
-		# Function to update the program file with the latest version from the repository.
+def updateSelf(downloader, filename):
-		def update_self(downloader, filename):
+	''' Update the program file with the latest version from the repository '''
 	# Note: downloader only used for options
 	if not os.access(filename, os.W_OK):
 		sys.exit('ERROR: no write permissions on %s' % filename)
 
 	downloader.to_screen('Updating to latest stable version...')
+
 	try:
 		latest_url = 'http://github.com/rg3/youtube-dl/raw/master/LATEST_VERSION'
 		latest_version = urllib.urlopen(latest_url).read().strip()
@@ -2719,14 +2714,24 @@ if __name__ == '__main__':
 		newcontent = urllib.urlopen(prog_url).read()
 	except (IOError, OSError), err:
 		sys.exit('ERROR: unable to download latest version')
+
 	try:
 		stream = open(filename, 'w')
 		stream.write(newcontent)
 		stream.close()
 	except (IOError, OSError), err:
 		sys.exit('ERROR: unable to overwrite current version')
+
 	downloader.to_screen('Updated to version %s' % latest_version)
 
+
+if __name__ == '__main__':
+	try:
+		# Modules needed only when running the main program
+		import getpass
+		import optparse
+
+
 		# Parse command line
 		parser = optparse.OptionParser(
 			usage='Usage: %prog [options] url...',
@@ -2981,7 +2986,7 @@ if __name__ == '__main__':
 
 		# Update version
 		if opts.update_self:
-			update_self(fd, sys.argv[0])
+			updateSelf(fd, sys.argv[0])
 
 		# Maybe do nothing
 		if len(all_urls) < 1: