List key with embedded quote causes error

[ghost]

Current Behavior

The below code causes error

2018-05-16 12:37:10,585 - ydk - ERROR - Data is invalid according to the yang model. Error details: Unexpected character(s) 'c' ("c'][second='1233']").
---------------------------------------------------------------------------
YModelError                               Traceback (most recent call last)
<ipython-input-7-ee771e2b8880> in <module>()
----> 1 q=codec.encode(codec_p,r)

~/p/lib/python3.6/site-packages/ydk/errors/error_handler.py in helper(self, provider, entity, *args, **kwargs)
    110             err_msg = "'{0}' and '{1}' cannot be None".format(pname, ename)
    111             raise _YServiceError(error_msg=err_msg)
--> 112         return func(self, provider, entity, *args, **kwargs)
    113     return helper

~/p/lib/python3.6/site-packages/ydk/services/codec_service.py in encode(self, provider, entity_holder, pretty, subtree)
     76             return payload_list
     77         else:
---> 78             return self._encode(provider, entity_holder, pretty, subtree)
     79 
     80     def _encode(self, provider, entity, pretty, subtree):

~/p/lib/python3.6/site-packages/ydk/services/codec_service.py in _encode(self, provider, entity, pretty, subtree)
    108             result = codec_service.encode(data_node, provider.encoding, pretty)
    109             self.logger.debug("Performing encode operation, resulting in {}".format(result))
--> 110             return result
    111 
    112     @_check_argument

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/contextlib.py in __exit__(self, type, value, traceback)
     97                 value = type()
     98             try:
---> 99                 self.gen.throw(type, value, traceback)
    100             except StopIteration as exc:
    101                 # Suppress StopIteration *unless* it's the same exception that

~/p/lib/python3.6/site-packages/ydk/errors/error_handler.py in handle_runtime_error()
     80     finally:
     81         if _exc:
---> 82             _raise(_exc)
     83 
     84 

~/p/lib/python3.6/site-packages/ydk/errors/error_handler.py in _raise(exc)
     52     """
     53     if sys.version_info >= (3,3):
---> 54         exec("raise exc from None")
     55     else:
     56         raise exc

~/p/lib/python3.6/site-packages/ydk/errors/error_handler.py in <module>()

YModelError:  Unexpected character(s) 'c' ("c'][second='1233']"). Path: 

Steps to Reproduce

Run the below script

Your Script

from ydk.models.ydktest.ydktest_sanity import Runner

r = Runner()
t = Runner.TwoKeyList()
t.first = "ab'c"
t.second = 1233
r.two_key_list.append(t)
crud.create(provider, r)

[ghost]

Problem also exists with embedded slash inside key value

[ghost]

The below test case needs to be fixed:

ydk-gen/sdk/python/core/tests/test_sanity_levels.py

Line 754 in a83b6a4

def test_embedded_single_quote_list_key(self):

[ygorelik]

Fixed the issue in C++, Python, and Go. The solution includes smart calculation of key tokens for segment_path values. By default the single quote symbol is used to enclose key value. But when the key value includes single quote characters, the double quotes characters are used to enclose key value.
Here example of a test in Python:
'''

def test_embedded_quotes_list_key(self):
    t1 = Runner.TwoKeyList()
    t1.first = "ab'c"
    t1.second = 1233
    t2 = Runner.TwoKeyList()
    t2.first = 'ab"c'
    t2.second = 3211
    r = Runner()
    r.two_key_list.extend(t1, t2)

    self.crud.create(self.ncc, r)

    runner_read = self.crud.read(self.ncc, Runner())
    self.assertEqual(r, runner_read)

    self.crud.delete(self.ncc, r)

'''

The solution changes affects YDK core and generated bundles code. The user API is not affected.

[ygorelik]

Refactored code for Python API to avoid changes in generated bundle code. All tests passed.