def bytes_iter(obj):
"""Turn a complex object into an iterator of byte strings.
The resulting iterator can be used for caching.
"""
if obj is None:
return
elif isinstance(obj, six.binary_type):
yield obj
elif isinstance(obj, six.text_type):
yield obj
elif isinstance(obj, (date, datetime)):
yield obj.isoformat()
elif is_mapping(obj):
for key in sorted(obj.keys()):
for out in chain(bytes_iter(key), bytes_iter(obj[key])):
yield out
elif is_sequence(obj):
if isinstance(obj, set):
obj = sorted(obj)
for item in obj:
for out in bytes_iter(item):
yield out
elif isinstance(
obj,
(types.FunctionType, types.BuiltinFunctionType, types.MethodType,
types.BuiltinMethodType, types.UnboundMethodType)):
yield getattr(obj, 'func_name', '')
else:
yield unicode(obj)
def bytes_iter(obj) -> Iterable[bytes]:
"""Turn a complex object into an iterator of byte strings.
The resulting iterator can be used for caching.
"""
if obj is None:
return
elif isinstance(obj, (bytes, str)):
yield _bytes_str(obj)
elif isinstance(obj, (date, datetime)):
yield _bytes_str(obj.isoformat())
elif is_mapping(obj):
for key in sorted(obj.keys()):
for out in chain(bytes_iter(key), bytes_iter(obj[key])):
yield out
elif is_sequence(obj):
if isinstance(obj, (list, set)):
try:
obj = sorted(obj)
except Exception:
pass
for item in obj:
for out in bytes_iter(item):
yield out
elif isinstance(obj, (types.FunctionType, types.BuiltinFunctionType,
types.MethodType, types.BuiltinMethodType)):
yield _bytes_str(getattr(obj, 'func_name', ''))
else:
yield _bytes_str(str(obj))
def clean_dict(data):
"""Remove None-valued keys from a dictionary, recursively."""
if is_mapping(data):
out = {}
for k, v in data.items():
if v is not None:
out[k] = clean_dict(v)
return out
elif is_sequence(data):
return [clean_dict(d) for d in data if d is not None]
return data
