Python - pytest - WebDriver - is not JSON serializable #6763
Description
Hey Guys,
I use:
pytest==4.0.2
websocket-client==0.54.0
parse==1.9.0
selenium==3.14.1
psutil
pywin32==224
pytest_bdd==3.0.1
pytest-html==1.19.0
I use page object model. I want to pass my driver to the constructor of the BasePage class. BasePage in turn is inherited by HomePage.
class BasePage:
def __init__(self, browser):
self.browser = browser
class HomePage(BasePage):
def __init__(self, browser):
super().__init__(browser)
I invoke wedriver using pytest fixture. It seems like I can not pass driver to base class constructor.
The final error is:
def default(self, o):
"""Implement this method in a subclass such that it returns
a serializable object for ``o``, or calls the base implementation
(to raise a ``TypeError``).
But where should this be implemented? In the driver code? My base class?
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self = <selenium.webdriver.chrome.remote_connection.ChromeRemoteConnection object at 0x04C8BFF0>, command = 'findElement'
params = {'sessionId': '537ad5c51c4e8b764d08118d6bcbafa3', 'using': <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")>, 'value': 'xpath'}
def execute(self, command, params):
"""
Send a command to the remote server.
Any path subtitutions required for the URL mapped to the command should be
included in the command parameters.
:Args:
- command - A string specifying the command to execute.
- params - A dictionary of named parameters to send with the command as
its JSON payload.
"""
command_info = self._commands[command]
assert command_info is not None, 'Unrecognised command %s' % command
path = string.Template(command_info[1]).substitute(params)
if hasattr(self, 'w3c') and self.w3c and isinstance(params, dict) and 'sessionId' in params:
del params['sessionId']
> data = utils.dump_json(params)
C:\Users\...\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\remote_connection.py:374:
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json_struct = {'sessionId': '537ad5c51c4e8b764d08118d6bcbafa3', 'using': <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")>, 'value': 'xpath'}
def dump_json(json_struct):
> return json.dumps(json_struct)
C:\Users\...\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\utils.py:33:
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obj = {'sessionId': '537ad5c51c4e8b764d08118d6bcbafa3', 'using': <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")>, 'value': 'xpath'}, skipkeys = False
ensure_ascii = True, check_circular = True, allow_nan = True, cls = None, indent = None, separators = None, default = None, sort_keys = False, kw = {}
def dumps(obj, skipkeys=False, ensure_ascii=True, check_circular=True,
allow_nan=True, cls=None, indent=None, separators=None,
default=None, sort_keys=False, **kw):
"""Serialize ``obj`` to a JSON formatted ``str``.
If ``skipkeys`` is true then ``dict`` keys that are not basic types
(``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped
instead of raising a ``TypeError``.
If ``ensure_ascii`` is false, then the return value can contain non-ASCII
characters if they appear in strings contained in ``obj``. Otherwise, all
such characters are escaped in JSON strings.
If ``check_circular`` is false, then the circular reference check
for container types will be skipped and a circular reference will
result in an ``OverflowError`` (or worse).
If ``allow_nan`` is false, then it will be a ``ValueError`` to
serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``) in
strict compliance of the JSON specification, instead of using the
JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).
If ``indent`` is a non-negative integer, then JSON array elements and
object members will be pretty-printed with that indent level. An indent
level of 0 will only insert newlines. ``None`` is the most compact
representation.
If specified, ``separators`` should be an ``(item_separator, key_separator)``
tuple. The default is ``(', ', ': ')`` if *indent* is ``None`` and
``(',', ': ')`` otherwise. To get the most compact JSON representation,
you should specify ``(',', ':')`` to eliminate whitespace.
``default(obj)`` is a function that should return a serializable version
of obj or raise TypeError. The default simply raises TypeError.
If *sort_keys* is true (default: ``False``), then the output of
dictionaries will be sorted by key.
To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the
``.default()`` method to serialize additional types), specify it with
the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.
"""
# cached encoder
if (not skipkeys and ensure_ascii and
check_circular and allow_nan and
cls is None and indent is None and separators is None and
default is None and not sort_keys and not kw):
> return _default_encoder.encode(obj)
C:\Users\...\AppData\Local\Programs\Python\Python35-32\lib\json\__init__.py:230:
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self = <json.encoder.JSONEncoder object at 0x0400E070>
o = {'sessionId': '537ad5c51c4e8b764d08118d6bcbafa3', 'using': <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")>, 'value': 'xpath'}
def encode(self, o):
"""Return a JSON string representation of a Python data structure.
>>> from json.encoder import JSONEncoder
>>> JSONEncoder().encode({"foo": ["bar", "baz"]})
'{"foo": ["bar", "baz"]}'
"""
# This is for extremely simple cases and benchmarks.
if isinstance(o, str):
if self.ensure_ascii:
return encode_basestring_ascii(o)
else:
return encode_basestring(o)
# This doesn't pass the iterator directly to ''.join() because the
# exceptions aren't as detailed. The list call should be roughly
# equivalent to the PySequence_Fast that ''.join() would do.
> chunks = self.iterencode(o, _one_shot=True)
C:\Users\...\AppData\Local\Programs\Python\Python35-32\lib\json\encoder.py:198:
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self = <json.encoder.JSONEncoder object at 0x0400E070>
o = {'sessionId': '537ad5c51c4e8b764d08118d6bcbafa3', 'using': <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")>, 'value': 'xpath'}, _one_shot = True
def iterencode(self, o, _one_shot=False):
"""Encode the given object and yield each string
representation as available.
For example::
for chunk in JSONEncoder().iterencode(bigobject):
mysocket.write(chunk)
"""
if self.check_circular:
markers = {}
else:
markers = None
if self.ensure_ascii:
_encoder = encode_basestring_ascii
else:
_encoder = encode_basestring
def floatstr(o, allow_nan=self.allow_nan,
_repr=float.__repr__, _inf=INFINITY, _neginf=-INFINITY):
# Check for specials. Note that this type of test is processor
# and/or platform-specific, so do tests which don't depend on the
# internals.
if o != o:
text = 'NaN'
elif o == _inf:
text = 'Infinity'
elif o == _neginf:
text = '-Infinity'
else:
return _repr(o)
if not allow_nan:
raise ValueError(
"Out of range float values are not JSON compliant: " +
repr(o))
return text
if (_one_shot and c_make_encoder is not None
and self.indent is None):
_iterencode = c_make_encoder(
markers, self.default, _encoder, self.indent,
self.key_separator, self.item_separator, self.sort_keys,
self.skipkeys, self.allow_nan)
else:
_iterencode = _make_iterencode(
markers, self.default, _encoder, self.indent, floatstr,
self.key_separator, self.item_separator, self.sort_keys,
self.skipkeys, _one_shot)
> return _iterencode(o, 0)
C:\Users\...\AppData\Local\Programs\Python\Python35-32\lib\json\encoder.py:256:
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self = <json.encoder.JSONEncoder object at 0x0400E070>, o = <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")>
def default(self, o):
"""Implement this method in a subclass such that it returns
a serializable object for ``o``, or calls the base implementation
(to raise a ``TypeError``).
For example, to support arbitrary iterators, you could
implement default like this::
def default(self, o):
try:
iterable = iter(o)
except TypeError:
pass
else:
return list(iterable)
# Let the base class default method raise the TypeError
return JSONEncoder.default(self, o)
"""
> raise TypeError(repr(o) + " is not JSON serializable")
E TypeError: <selenium.webdriver.chrome.webdriver.WebDriver (session="537ad5c51c4e8b764d08118d6bcbafa3")> is not JSON serializable
C:\Users\...\AppData\Local\Programs\Python\Python35-32\lib\json\encoder.py:179: TypeError