def __init__(self, **kwargs):
# the number of times the _get_command iterator has been run
self.iterations = 0
self.files_scanned = 0
self.files_optimised = 0
self.bytes_saved = 0
self.list_only = kwargs.get('list_only')
self.array_optimised_file = []
self.quiet = kwargs.get('quiet')
self.stdout = Scratch()
self.stderr = Scratch()
def __init__(self, **kwargs):
# the number of times the _get_command iterator has been run
self.iterations = 0
self.files_scanned = 0
self.files_optimised = 0
self.bytes_saved = 0
self.list_only = kwargs.get('list_only')
self.array_optimised_file = []
self.quiet = kwargs.get('quiet')
self.stdout = Scratch()
self.stderr = Scratch()
def __init__(self, **kwargs):
self.optimisers = {
'PNG': OptimisePNG(**kwargs),
'JPEG': OptimiseJPG(**kwargs),
'GIF': OptimiseGIF(**kwargs),
'GIFGIF': OptimiseAnimatedGIF(**kwargs)
}
self.__files_scanned = 0
self.__start_time = time.time()
self.exclude = {}
for dir in kwargs.get('exclude'):
if len(dir) == 0:
continue
self.exclude[dir] = True
self.quiet = kwargs.get('quiet')
# setup tempfile for stdout and stderr
self.stdout = Scratch()
self.stderr = Scratch()
def __init__(self, **kwargs):
self.optimisers = {
#'PNG': OptimisePNG(**kwargs),
'JPEG': OptimiseJPG(**kwargs),
#'GIF': OptimiseGIF(**kwargs),
#'GIFGIF': OptimiseAnimatedGIF(**kwargs)
}
self.__files_scanned = 0
self.__start_time = time.time()
self.exclude = {}
for dir in kwargs.get('exclude'):
if len(dir) == 0:
continue
self.exclude[dir] = True
self.quiet = kwargs.get('quiet')
self.identify_mime = kwargs.get('identify_mime')
# setup tempfile for stdout and stderr
self.stdout = Scratch()
self.stderr = Scratch()
class Optimiser(object):
"""
Super-class for optimisers
"""
input_placeholder = "__INPUT__"
output_placeholder = "__OUTPUT__"
# string to place between the basename and extension of output images
output_suffix = "-opt.smush"
def __init__(self, **kwargs):
# the number of times the _get_command iterator has been run
self.iterations = 0
self.files_scanned = 0
self.files_optimised = 0
self.bytes_saved = 0
self.list_only = kwargs.get('list_only')
self.array_optimised_file = []
self.quiet = kwargs.get('quiet')
self.stdout = Scratch()
self.stderr = Scratch()
def __del__(self):
self.stdout.destruct()
self.stderr.destruct()
def set_input(self, input):
self.iterations = 0
self.input = input
def _get_command(self):
"""
Returns the next command to apply
"""
command = False
if self.iterations < len(self.commands):
command = self.commands[self.iterations]
self.iterations += 1
return command
def _get_output_file_name(self):
"""
Returns the input file name with Optimiser.output_suffix inserted before the extension
"""
temp = tempfile.mkstemp(suffix=Optimiser.output_suffix)
try:
output_file_name = temp[1]
os.unlink(output_file_name)
return output_file_name
finally:
os.close(temp[0])
def __replace_placeholders(self, command, input, output):
"""
Replaces the input and output placeholders in a string with actual parameter values
"""
return command.replace(Optimiser.input_placeholder,
input).replace(Optimiser.output_placeholder,
output)
def _keep_smallest_file(self, input, output):
"""
Compares the sizes of two files, and discards the larger one
"""
input_size = os.path.getsize(input)
output_size = os.path.getsize(output)
# if the image was optimised (output is smaller than input), overwrite the input file with the output
# file.
if (output_size > 0 and output_size < input_size):
try:
shutil.copyfile(output, input)
self.files_optimised += 1
self.bytes_saved += (input_size - output_size)
except IOError:
logging.error("Unable to copy %s to %s: %s" %
(output, input, IOError))
sys.exit(1)
# delete the output file
os.unlink(output)
def _is_acceptable_image(self, input):
"""
Returns whether the input image can be used by a particular optimiser.
All optimisers are expected to define a variable called 'format' containing the file format
as returned by 'identify -format %m'
"""
test_command = 'identify -format %%m "%s"' % input
args = shlex.split(test_command)
try:
retcode = subprocess.call(args,
stdout=self.stdout.opened,
stderr=self.stderr.opened)
except OSError:
logging.error("Error executing command %s. Error was %s" %
(test_command, OSError))
sys.exit(1)
except:
# most likely no file matched
if self.quiet == False:
logging.warning("Cannot identify file.")
return False
if retcode != 0:
if self.quiet == False:
logging.warning("Cannot identify file.")
return False
output = self.stdout.read().strip()
return output.startswith(self.format)
def optimise(self):
"""
Calls the 'optimise_image' method on the object. Tests the 'optimised' file size. If the
generated file is larger than the original file, discard it, otherwise discard the input file.
"""
# make sure the input image is acceptable for this optimiser
if not self._is_acceptable_image(self.input):
logging.warning("%s is not a valid image for this optimiser" %
(self.input))
return
self.files_scanned += 1
while True:
command = self._get_command()
if not command:
break
output_file_name = self._get_output_file_name()
command = self.__replace_placeholders(command, self.input,
output_file_name)
logging.info("Executing %s" % (command))
args = shlex.split(command)
try:
retcode = subprocess.call(args,
stdout=self.stdout.opened,
stderr=self.stderr.opened)
except OSError:
logging.error("Error executing command %s. Error was %s" %
(command, OSError))
sys.exit(1)
if retcode != 0:
# gifsicle seems to fail by the file size?
os.unlink(output_file_name)
else:
if self.list_only == False:
# compare file sizes if the command executed successfully
self._keep_smallest_file(self.input, output_file_name)
else:
self._list_only(self.input, output_file_name)
def _list_only(self, input, output):
"""
Always keeps input, but still compares the sizes of two files
"""
input_size = os.path.getsize(input)
output_size = os.path.getsize(output)
if (output_size > 0 and output_size < input_size):
self.files_optimised += 1
self.bytes_saved += (input_size - output_size)
self.array_optimised_file.append(input)
# delete the output file
os.unlink(output)
class Optimiser(object):
"""
Super-class for optimisers
"""
input_placeholder = "__INPUT__"
output_placeholder = "__OUTPUT__"
# string to place between the basename and extension of output images
output_suffix = "-opt.smush"
def __init__(self, **kwargs):
# the number of times the _get_command iterator has been run
self.iterations = 0
self.files_scanned = 0
self.files_optimised = 0
self.bytes_saved = 0
self.list_only = kwargs.get('list_only')
self.array_optimised_file = []
self.quiet = kwargs.get('quiet')
self.stdout = Scratch()
self.stderr = Scratch()
def __del__(self):
self.stdout.destruct()
self.stderr.destruct()
def set_input(self, input):
self.iterations = 0
self.input = input
def _get_command(self):
"""
Returns the next command to apply
"""
command = False
if self.iterations < len(self.commands):
command = self.commands[self.iterations]
self.iterations += 1
return command
def _get_output_file_name(self):
"""
Returns the input file name with Optimiser.output_suffix inserted before the extension
"""
temp = tempfile.mkstemp(suffix=Optimiser.output_suffix)
output_file_name = temp[1]
os.unlink(output_file_name)
return output_file_name
def __replace_placeholders(self, command, input, output):
"""
Replaces the input and output placeholders in a string with actual parameter values
"""
return command.replace(Optimiser.input_placeholder, input).replace(Optimiser.output_placeholder, output)
def _keep_smallest_file(self, input, output):
"""
Compares the sizes of two files, and discards the larger one
"""
input_size = os.path.getsize(input)
output_size = os.path.getsize(output)
# if the image was optimised (output is smaller than input), overwrite the input file with the output
# file.
if (output_size > 0 and output_size < input_size):
try:
shutil.copyfile(output, input)
self.files_optimised += 1
self.bytes_saved += (input_size - output_size)
except IOError:
logging.error("Unable to copy %s to %s: %s" % (output, input, IOError))
sys.exit(1)
# delete the output file
os.unlink(output)
def _is_acceptable_image(self, input):
"""
Returns whether the input image can be used by a particular optimiser.
All optimisers are expected to define a variable called 'format' containing the file format
as returned by 'identify -format %m'
"""
test_command = 'identify -format %%m "%s"' % input
args = shlex.split(test_command)
try:
retcode = subprocess.call(args, stdout=self.stdout.opened, stderr=self.stderr.opened)
except OSError:
logging.error("Error executing command %s. Error was %s" % (test_command, OSError))
sys.exit(1)
except:
# most likely no file matched
if self.quiet == False:
logging.warning("Cannot identify file.")
return False
if retcode != 0:
if self.quiet == False:
logging.warning("Cannot identify file.")
return False
output = self.stdout.read().strip()
return output.startswith(self.format)
def optimise(self):
"""
Calls the 'optimise_image' method on the object. Tests the 'optimised' file size. If the
generated file is larger than the original file, discard it, otherwise discard the input file.
"""
# make sure the input image is acceptable for this optimiser
if not self._is_acceptable_image(self.input):
logging.warning("%s is not a valid image for this optimiser" % (self.input))
return
self.files_scanned += 1
while True:
command = self._get_command()
if not command:
break
output_file_name = self._get_output_file_name()
command = self.__replace_placeholders(command, self.input, output_file_name)
logging.info("Executing %s" % (command))
args = shlex.split(command)
try:
retcode = subprocess.call(args, stdout=self.stdout.opened, stderr=self.stderr.opened)
except OSError:
logging.error("Error executing command %s. Error was %s" % (command, OSError))
sys.exit(1)
if retcode != 0:
# gifsicle seems to fail by the file size?
os.unlink(output_file_name)
else :
if self.list_only == False:
# compare file sizes if the command executed successfully
self._keep_smallest_file(self.input, output_file_name)
else:
self._list_only(self.input, output_file_name)
def _list_only(self, input, output):
"""
Always keeps input, but still compares the sizes of two files
"""
input_size = os.path.getsize(input)
output_size = os.path.getsize(output)
if (output_size > 0 and output_size < input_size):
self.files_optimised += 1
self.bytes_saved += (input_size - output_size)
self.array_optimised_file.append(input)
# delete the output file
os.unlink(output)
# 容差参数，主要用于让被抓物体固定不动后再去抓
ERROR = 0.005
MAX = 8
# 初始化
data = ''
lastdata = ''
ip_port = ('10.0.0.1', 9999) # 监听9999端口
sk = socket.socket(socket.AF_INET,socket.SOCK_DGRAM,0) # UDP协议
sk.bind(ip_port)
st = threading.Thread(target = listen, args = ())
st.start()
count = MAX
mutex = threading.Lock()
scratch = Scratch()
capture = cv2.VideoCapture(0)
ratio = real_width / img_width
cascade = cv2.CascadeClassifier('/Users/guliqi/Desktop/Classifier/xml/cascade.xml')
while True:
ret, frame = capture.read()
if data != '':
if data.upper() == b'COALA': # 抓考拉
gray = frame.cvtColor(frame, cv2.COLOR_BGR2GRAY)
kolas = cascade.detectMultiScale(gray, 2.4, 7)
objects = []
for (x, y, w, h) in kolas:
frame = cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 0, 0), 2)
objects.append((x + w / 2, y + h / 2))
def setUp(self):
self.client = Scratch()
class ParsingTests(unittest.TestCase):
"""
Must have Scratch running with remote sensor connections enabled
"""
def setUp(self):
self.client = Scratch()
def test_broadcast(self):
self.assertEquals(
self.client._parse('\x00\x00\x00\x0fbroadcast "a b"'),
('broadcast', 'a b')
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x13broadcast """a b"""'),
('broadcast', '"a b"')
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x17broadcast """""a b"""""'),
('broadcast', '""a b""')
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x13broadcast """a"" b"'),
('broadcast', '"a" b')
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x17broadcast """a"" ""b"""'),
('broadcast', '"a" "b"')
)
def test_sensorupdate(self):
self.assertEquals(
self.client._parse('\x00\x00\x00\x14sensor-update "a" 0 '),
('sensor-update', {'a': 0})
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x16sensor-update "a" "c" '),
('sensor-update', {'a': 'c'})
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x16sensor-update "a b" 0 '),
('sensor-update', {'a b': 0})
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x1asensor-update """a b""" 0 '),
('sensor-update', {'"a b"': 0})
)
self.assertEquals(
self.client._parse('\x00\x00\x003sensor-update """a b""" "hello hi" "a" "c" "a b" 0 '),
('sensor-update', {'"a b"': 'hello hi', 'a': 'c', 'a b': 0})
)
self.assertEquals(
self.client._parse('\x00\x00\x00\x1esensor-update """a"" ""b""" 0 '),
('sensor-update', {'"a" "b"': 0})
)
self.assertEquals(
self.client._parse('\x00\x00\x00*sensor-update """a"" ""b""" """c"" ""d""" '),
('sensor-update', {'"a" "b"': '"c" "d"'})
)
def test_is_msg(self):
self.assertTrue(self.client._is_msg('\x00\x00\x00\x14sensor-update "a" 0 '))
self.assertTrue(self.client._is_msg('\x00\x00\x00\x0ebroadcast "hi"'))
self.assertFalse(self.client._is_msg('\x00\x00\x00\x14sensor-update "a"'))
self.assertFalse(self.client._is_msg('\x00\x00\x00\x14benbor-update "a" 0 '))
self.assertFalse(self.client._is_msg(''))
self.assertFalse(self.client._is_msg(None))
self.assertFalse(self.client._is_msg('\x00\x00\x00\x00'))
self.assertFalse(self.client._is_msg('\x00\x00\x00'))
def test_escape(self):
self.assertEquals(self.client._escape(''), '')
self.assertEquals(self.client._escape('"a"'), '""a""')
def test_unescape(self):
self.assertEquals(self.client._unescape(''), '')
self.assertEquals(self.client._unescape('a'), 'a')
self.assertEquals(self.client._unescape('""a""'), '"a"')
self.assertEquals(self.client._unescape(0), 0)
class Smush():
def __init__(self, **kwargs):
self.optimisers = {
'PNG': OptimisePNG(**kwargs),
'JPEG': OptimiseJPG(**kwargs),
'GIF': OptimiseGIF(**kwargs),
'GIFGIF': OptimiseAnimatedGIF(**kwargs)
}
self.__files_scanned = 0
self.__start_time = time.time()
self.exclude = {}
for dir in kwargs.get('exclude', []):
if len(dir) == 0:
continue
self.exclude[dir] = True
self.quiet = kwargs.get('quiet')
self.identify_mime = kwargs.get('identify_mime')
# setup tempfile for stdout and stderr
self.stdout = Scratch()
self.stderr = Scratch()
def __del__(self):
pass
#self.stdout.destruct()
#self.stderr.destruct()
def smush(self, file):
"""
Optimises a file
"""
key = self.__get_image_format(file)
if key in self.optimisers:
#logging.info('optimising file %s' % (file))
self.__files_scanned += 1
self.optimisers[key].set_input(file)
self.optimisers[key].optimise()
__smush = smush
def process(self, dir, recursive):
"""
Iterates through the input directory optimising files
"""
if recursive:
self.__walk(dir, self.__smush)
else:
if os.path.isdir(dir):
dir = os.path.abspath(dir)
for file in os.listdir(dir):
if self.__checkExclude(file):
continue
if self.identify_mime:
import mimetypes
(type,encoding) = mimetypes.guess_type(file)
if type and (type[:5] != "image"):
continue
self.__smush(os.path.join(dir, file))
elif os.path.isfile(dir):
self.__smush(dir)
def __walk(self, dir, callback):
""" Walks a directory, and executes a callback on each file """
dir = os.path.abspath(dir)
logging.info('walking %s' % (dir))
for file in os.listdir(dir):
if self.__checkExclude(file):
continue
if self.identify_mime:
import mimetypes
(type,encoding) = mimetypes.guess_type(file)
if type and (type[:5] != "image"):
continue
nfile = os.path.join(dir, file)
callback(nfile)
if os.path.isdir(nfile):
self.__walk(nfile, callback)
def __get_image_format(self, input):
"""
Returns the image format for a file.
"""
test_command = 'identify -format %%m "%s"' % input
args = shlex.split(test_command.encode('utf8'))
try:
retcode = subprocess.call(args, stdout=self.stdout.opened, stderr=self.stderr.opened)
if retcode != 0:
if self.quiet == False:
logging.warning(self.stderr.read().strip())
return False
except OSError:
logging.error('Error executing command %s. Error was %s' % (test_command, OSError))
sys.exit(1)
except:
# most likely no file matched
if self.quiet == False:
logging.warning('Cannot identify file.')
return False
return self.stdout.read().strip()[:6]
def stats(self):
output = []
output.append('\n%d files scanned:' % (self.__files_scanned))
arr = []
for key, optimiser in self.optimisers.iteritems():
# divide optimiser.files_optimised by 2 for each optimiser since each optimised file
# gets counted twice
output.append(' %d %ss optimised out of %d scanned. Saved %dkb' % (
optimiser.files_optimised // 2,
key,
optimiser.files_scanned,
optimiser.bytes_saved / 1024))
arr.extend(optimiser.array_optimised_file)
if (len(arr) != 0):
output.append('Modified files:')
for filename in arr:
output.append(' %s' % filename)
output.append('Total time taken: %.2f seconds' % (time.time() - self.__start_time))
return {'output': "\n".join(output), 'modified': arr}
def __checkExclude(self, file):
if file in self.exclude:
logging.info('%s is excluded.' % (file))
return True
return False
class Smush():
def __init__(self, **kwargs):
self.optimisers = {
#'PNG': OptimisePNG(**kwargs),
'JPEG': OptimiseJPG(**kwargs),
#'GIF': OptimiseGIF(**kwargs),
#'GIFGIF': OptimiseAnimatedGIF(**kwargs)
}
self.__files_scanned = 0
self.__start_time = time.time()
self.exclude = {}
for dir in kwargs.get('exclude'):
if len(dir) == 0:
continue
self.exclude[dir] = True
self.quiet = kwargs.get('quiet')
self.identify_mime = kwargs.get('identify_mime')
# setup tempfile for stdout and stderr
self.stdout = Scratch()
self.stderr = Scratch()
def __del__(self):
self.stdout.destruct()
self.stderr.destruct()
def __smush(self, file):
"""
Optimises a file
"""
key = self.__get_image_format(file)
if key in self.optimisers:
logging.info('optimising file %s' % (file))
self.__files_scanned += 1
self.optimisers[key].set_input(file)
self.optimisers[key].optimise()
def process(self, dir, recursive):
"""
Iterates through the input directory optimising files
"""
if recursive:
self.__walk(dir, self.__smush)
else:
if os.path.isdir(dir):
dir = os.path.abspath(dir)
for file in os.listdir(dir):
if self.__checkExclude(file):
continue
if self.identify_mime:
import mimetypes
(type,encoding) = mimetypes.guess_type(file)
if type and (type[:5] != "image"):
continue
self.__smush(os.path.join(dir, file))
elif os.path.isfile(dir):
self.__smush(dir)
def __walk(self, dir, callback):
""" Walks a directory, and executes a callback on each file """
dir = os.path.abspath(dir)
logging.info('walking %s' % (dir))
for file in os.listdir(dir):
if self.__checkExclude(file):
continue
if self.identify_mime:
import mimetypes
(type,encoding) = mimetypes.guess_type(file)
if type and (type[:5] != "image"):
continue
nfile = os.path.join(dir, file)
callback(nfile)
if os.path.isdir(nfile):
self.__walk(nfile, callback)
def __get_image_format(self, input):
"""
Returns the image format for a file.
"""
test_command = 'identify -format %%m "%s"' % input
args = shlex.split(test_command)
try:
retcode = subprocess.call(args, stdout=self.stdout.opened, stderr=self.stderr.opened)
if retcode != 0:
if self.quiet == False:
logging.warning(self.stderr.read().strip())
return False
except OSError:
logging.error('Error executing command %s. Error was %s' % (test_command, OSError))
sys.exit(1)
except:
# most likely no file matched
if self.quiet == False:
logging.warning('Cannot identify file.')
return False
return self.stdout.read().strip()[:6]
def stats(self):
output = []
output.append('\n%d files scanned:' % (self.__files_scanned))
arr = []
for key, optimiser in self.optimisers.items():
# divide optimiser.files_optimised by 2 for each optimiser since each optimised file
# gets counted twice
output.append(' %d %ss optimised out of %d scanned. Saved %dkb' % (
optimiser.files_optimised // 2,
key,
optimiser.files_scanned,
optimiser.bytes_saved / 1024))
arr.extend(optimiser.array_optimised_file)
if (len(arr) != 0):
output.append('Modified files:')
for filename in arr:
output.append(' %s' % filename)
output.append('Total time taken: %.2f seconds' % (time.time() - self.__start_time))
return {'output': "\n".join(output), 'modified': arr}
def __checkExclude(self, file):
if file in self.exclude:
logging.info('%s is excluded.' % (file))
return True
return False
from scratch import Scratch
from scratch.translater import translate
sc = Scratch('Truth 21w4a.sb3')
print(translate(sc.analyze()['blockStat'], 'cn-lang.json'))
def setUp(self):
self.client = Scratch()
class ParsingTests(unittest.TestCase):
"""
Must have Scratch running with remote sensor connections enabled
"""
def setUp(self):
self.client = Scratch()
def test_broadcast(self):
self.assertEquals(
self.client._parse('\x00\x00\x00\x0fbroadcast "a b"'),
('broadcast', 'a b'))
self.assertEquals(
self.client._parse('\x00\x00\x00\x13broadcast """a b"""'),
('broadcast', '"a b"'))
self.assertEquals(
self.client._parse('\x00\x00\x00\x17broadcast """""a b"""""'),
('broadcast', '""a b""'))
self.assertEquals(
self.client._parse('\x00\x00\x00\x13broadcast """a"" b"'),
('broadcast', '"a" b'))
self.assertEquals(
self.client._parse('\x00\x00\x00\x17broadcast """a"" ""b"""'),
('broadcast', '"a" "b"'))
def test_sensorupdate(self):
self.assertEquals(
self.client._parse('\x00\x00\x00\x14sensor-update "a" 0 '),
('sensor-update', {
'a': 0
}))
self.assertEquals(
self.client._parse('\x00\x00\x00\x16sensor-update "a" "c" '),
('sensor-update', {
'a': 'c'
}))
self.assertEquals(
self.client._parse('\x00\x00\x00\x16sensor-update "a b" 0 '),
('sensor-update', {
'a b': 0
}))
self.assertEquals(
self.client._parse('\x00\x00\x00\x1asensor-update """a b""" 0 '),
('sensor-update', {
'"a b"': 0
}))
self.assertEquals(
self.client._parse(
'\x00\x00\x003sensor-update """a b""" "hello hi" "a" "c" "a b" 0 '
), ('sensor-update', {
'"a b"': 'hello hi',
'a': 'c',
'a b': 0
}))
self.assertEquals(
self.client._parse(
'\x00\x00\x00\x1esensor-update """a"" ""b""" 0 '),
('sensor-update', {
'"a" "b"': 0
}))
self.assertEquals(
self.client._parse(
'\x00\x00\x00*sensor-update """a"" ""b""" """c"" ""d""" '),
('sensor-update', {
'"a" "b"': '"c" "d"'
}))
def test_is_msg(self):
self.assertTrue(
self.client._is_msg('\x00\x00\x00\x14sensor-update "a" 0 '))
self.assertTrue(self.client._is_msg('\x00\x00\x00\x0ebroadcast "hi"'))
self.assertFalse(
self.client._is_msg('\x00\x00\x00\x14sensor-update "a"'))
self.assertFalse(
self.client._is_msg('\x00\x00\x00\x14benbor-update "a" 0 '))
self.assertFalse(self.client._is_msg(''))
self.assertFalse(self.client._is_msg(None))
self.assertFalse(self.client._is_msg('\x00\x00\x00\x00'))
self.assertFalse(self.client._is_msg('\x00\x00\x00'))
def test_escape(self):
self.assertEquals(self.client._escape(''), '')
self.assertEquals(self.client._escape('"a"'), '""a""')
def test_unescape(self):
self.assertEquals(self.client._unescape(''), '')
self.assertEquals(self.client._unescape('a'), 'a')
self.assertEquals(self.client._unescape('""a""'), '"a"')
self.assertEquals(self.client._unescape(0), 0)