https://github.com/lmfit/lmfit-py
Tip revision: e278951c36b88c7259016bc74668a02d76eb9350 authored by Matthew Newville on 23 October 2018, 11:48:40 UTC
use inspect.getfullargspec for Python3
use inspect.getfullargspec for Python3
Tip revision: e278951
jsonutils.py
#!/usr/bin/env python
"""JSON utilities for larch objects."""
from base64 import b64decode, b64encode
import json
import sys
import numpy as np
import six
try:
import dill
HAS_DILL = True
except ImportError:
HAS_DILL = False
try:
from pandas import DataFrame, Series, read_json
except ImportError:
DataFrame = Series = type(NotImplemented)
read_json = None
def bindecode(val):
"""b64decode wrapper, Python 2 and 3 version."""
return b64decode(six.b(val))
if six.PY3:
def binencode(val):
"""b64encode wrapper, Python 3 version."""
return str(b64encode(val), 'utf-8') # b64encode results is /always/ UTF-8
else:
def binencode(val):
"""b64encode wrapper, Python 2 version."""
return str(b64encode(val))
def find_importer(obj):
"""find importer of an object"""
oname = obj.__name__
for modname, module in sys.modules.items():
if modname.startswith('__main__'):
continue
t = getattr(module, oname, None)
if t is obj:
return modname
return None
def import_from(modulepath, objectname):
"""wrapper for __import__ for nested objects"""
path = modulepath.split('.')
top = path.pop(0)
parent = __import__(top)
while len(path) > 0:
parent = getattr(parent, path.pop(0))
return getattr(parent, objectname)
def encode4js(obj):
"""Prepare an object for json encoding.
It has special handling for many Python types, including:
- pandas dataframes and series
- numpy ndarrays
- complex numbers
"""
if isinstance(obj, DataFrame):
return dict(__class__='PDataFrame', value=json.loads(obj.to_json()))
elif isinstance(obj, DataFrame):
return dict(__class__='PSeries', value=encode4js(obj.to_dict()))
elif isinstance(obj, np.ndarray):
if 'complex' in obj.dtype.name:
val = [(obj.real).tolist(), (obj.imag).tolist()]
elif obj.dtype.name == 'object':
val = [encode4js(item) for item in obj['value']]
else:
val = obj.flatten().tolist()
return dict(__class__='NDArray', __shape__=obj.shape,
__dtype__=obj.dtype.name, value=val)
elif isinstance(obj, (np.float, np.int)):
return float(obj)
elif isinstance(obj, six.string_types):
try:
return str(obj)
except UnicodeError:
return obj
elif isinstance(obj, np.complex):
return dict(__class__='Complex', value=(obj.real, obj.imag))
elif isinstance(obj, (tuple, list)):
ctype = 'List'
if isinstance(obj, tuple):
ctype = 'Tuple'
val = [encode4js(item) for item in obj]
return dict(__class__=ctype, value=val)
elif isinstance(obj, dict):
out = dict(__class__='Dict')
for key, val in obj.items():
out[encode4js(key)] = encode4js(val)
return out
elif callable(obj):
val, importer = None, None
pyvers = "%d.%d" % (sys.version_info.major,
sys.version_info.minor)
if HAS_DILL:
val = binencode(dill.dumps(obj))
else:
val = None
importer = find_importer(obj)
return dict(__class__='Callable', __name__=obj.__name__,
pyversion=pyvers, value=val, importer=importer)
return obj
def decode4js(obj):
"""Return decoded Python object from encoded object."""
if not isinstance(obj, dict):
return obj
out = obj
classname = obj.pop('__class__', None)
if classname is None:
return obj
if classname == 'Complex':
out = obj['value'][0] + 1j*obj['value'][1]
elif classname in ('List', 'Tuple'):
out = []
for item in obj['value']:
out.append(decode4js(item))
if classname == 'Tuple':
out = tuple(out)
elif classname == 'NDArray':
if obj['__dtype__'].startswith('complex'):
re = np.fromiter(obj['value'][0], dtype='double')
im = np.fromiter(obj['value'][1], dtype='double')
out = re + 1j*im
elif obj['__dtype__'].startswith('object'):
val = [decode4js(v) for v in obj['value']]
out = np.array(val, dtype=obj['__dtype__'])
else:
out = np.fromiter(obj['value'], dtype=obj['__dtype__'])
out.shape = obj['__shape__']
elif classname == 'PDataFrame' and read_json is not None:
out = read_json(json.dumps(obj['value']))
elif classname == 'PSeries':
out = Series(obj['value'])
elif classname == 'Callable':
out = val = obj['__name__']
pyvers = "%d.%d" % (sys.version_info.major,
sys.version_info.minor)
if pyvers == obj['pyversion'] and HAS_DILL:
out = dill.loads(bindecode(obj['value']))
elif obj['importer'] is not None:
out = import_from(obj['importer'], val)
elif classname in ('Dict', 'dict'):
out = {}
for key, val in obj.items():
out[key] = decode4js(val)
return out