Flask Converters

flask_converters.py

class ListConverter(BaseConverter):
	def to_python(self, value):
		if isinstance(value, (set, list, tuple)):
			return list(value)

		try:
			parsed_value = json.loads(value)
		except:
			parsed_value = None

		if isinstance(parsed_value, (set, list, tuple)):
			return parsed_value
		return value.split(',')

	def to_url(self, values):
		return ','.join(map(url_quote, values))


class LongConverter(IntegerConverter):
	num_convert = long


class BooleanConverter(BaseConverter):
	def __init__(self, url_map, randomify=False):
		self.regex_true = ['yes', 'y', 'true', 't', '1']
		self.regex_false = ['no', 'n', 'false', 'f', '0']

		super(BooleanConverter, self).__init__(url_map)
		self.randomify = randomify
		self.regex = '(?:{0}|{1}|maybe)'.format('|'.join(self.regex_true), '|'.join(self.regex_false))

	def to_python(self, value):
		if hasattr(value, 'lower'):
			value = value.lower()

		if value == 'maybe':
			if self.randomify:
				return not random.randrange(2)
			raise ValidationError()
		return value in self.regex_true

	def to_url(self, value):
		return value and self.regex_true[0] or self.regex_false[0]


class DateTimeConverter(BaseConverter):
	def to_python(self, value):
		if value == 'now':
			return now()
		elif value in ('', None):
			return value

		try:
			value = parse(value)
		except (ValueError, AttributeError):
			return value

		if value.tzinfo is None:
			current_timezone = getattr(g, 'current_timezone') if hasattr(g, 'current_timezone') else tzlocal()
			value = value.replace(tzinfo=current_timezone)

		return value.astimezone(tzutc())

	def to_url(self, value):
		value = value.replace(microsecond=0)
		if value.tzinfo is None:
			current_timezone = getattr(g, 'current_timezone') if hasattr(g, 'current_timezone') else tzlocal()
			value = as_localtime(value, current_timezone)
		return value.isoformat()


app.url_map.converters.update({
	'long': helpers.LongConverter,
	'list': helpers.ListConverter,
	'bool': helpers.BooleanConverter,
	'datetime': helpers.DateTimeConverter,
	'date': helpers.DateTimeConverter,
	'time': helpers.DateTimeConverter,
})

Very good!