issue_comments: 631125403

Yes, it is quite long though.

Error: ```

KeyError Traceback (most recent call last) ~\Anaconda3\lib\site-packages\xarray\backends\file_manager.py in _acquire_with_cache_info(self, needs_lock) 197 try: --> 198 file = self._cache[self._key] 199 except KeyError:

~\Anaconda3\lib\site-packages\xarray\backends\lru_cache.py in getitem(self, key) 52 with self._lock: ---> 53 value = self._cache[key] 54 self._cache.move_to_end(key)

KeyError: [<class 'netCDF4._netCDF4.Dataset'>, ('https://www.ncei.noaa.gov/thredds/dodsC/OisstBase/NetCDF/V2.0/AVHRR/201703/avhrr-only-v2.20170322.nc',), 'r', (('clobber', True), ('diskless', False), ('format', 'NETCDF4'), ('persist', False))]

During handling of the above exception, another exception occurred:

OSError Traceback (most recent call last) <ipython-input-2-2402d81dac52> in <module> 17 date_window = list_dates(cur_date - window, cur_date + window) 18 url_list = [url.format(x) for x in date_window] ---> 19 window_data=xr.open_mfdataset(url_list).sst 20 data.append(window_data.mean('time')) 21 print(data[-1])

~\Anaconda3\lib\site-packages\xarray\backends\api.py in open_mfdataset(paths, chunks, concat_dim, compat, preprocess, engine, lock, data_vars, coords, combine, autoclose, parallel, join, attrs_file, kwargs) 906 getattr_ = getattr 907 --> 908 datasets = [open_(p, open_kwargs) for p in paths] 909 file_objs = [getattr_(ds, "_file_obj") for ds in datasets] 910 if preprocess is not None:

~\Anaconda3\lib\site-packages\xarray\backends\api.py in <listcomp>(.0) 906 getattr_ = getattr 907 --> 908 datasets = [open_(p, **open_kwargs) for p in paths] 909 file_objs = [getattr_(ds, "_file_obj") for ds in datasets] 910 if preprocess is not None:

~\Anaconda3\lib\site-packages\xarray\backends\api.py in open_dataset(filename_or_obj, group, decode_cf, mask_and_scale, decode_times, autoclose, concat_characters, decode_coords, engine, chunks, lock, cache, drop_variables, backend_kwargs, use_cftime) 500 if engine == "netcdf4": 501 store = backends.NetCDF4DataStore.open( --> 502 filename_or_obj, group=group, lock=lock, **backend_kwargs 503 ) 504 elif engine == "scipy":

~\Anaconda3\lib\site-packages\xarray\backends\netCDF4_.py in open(cls, filename, mode, format, group, clobber, diskless, persist, lock, lock_maker, autoclose) 356 netCDF4.Dataset, filename, mode=mode, kwargs=kwargs 357 ) --> 358 return cls(manager, group=group, mode=mode, lock=lock, autoclose=autoclose) 359 360 def _acquire(self, needs_lock=True):

~\Anaconda3\lib\site-packages\xarray\backends\netCDF4_.py in init(self, manager, group, mode, lock, autoclose) 312 self._group = group 313 self._mode = mode --> 314 self.format = self.ds.data_model 315 self._filename = self.ds.filepath() 316 self.is_remote = is_remote_uri(self._filename)

~\Anaconda3\lib\site-packages\xarray\backends\netCDF4_.py in ds(self) 365 @property 366 def ds(self): --> 367 return self._acquire() 368 369 def open_store_variable(self, name, var):

~\Anaconda3\lib\site-packages\xarray\backends\netCDF4_.py in _acquire(self, needs_lock) 359 360 def _acquire(self, needs_lock=True): --> 361 with self._manager.acquire_context(needs_lock) as root: 362 ds = _nc4_require_group(root, self._group, self._mode) 363 return ds

~\Anaconda3\lib\contextlib.py in enter(self) 110 del self.args, self.kwds, self.func 111 try: --> 112 return next(self.gen) 113 except StopIteration: 114 raise RuntimeError("generator didn't yield") from None

~\Anaconda3\lib\site-packages\xarray\backends\file_manager.py in acquire_context(self, needs_lock) 184 def acquire_context(self, needs_lock=True): 185 """Context manager for acquiring a file.""" --> 186 file, cached = self._acquire_with_cache_info(needs_lock) 187 try: 188 yield file

~\Anaconda3\lib\site-packages\xarray\backends\file_manager.py in _acquire_with_cache_info(self, needs_lock) 202 kwargs = kwargs.copy() 203 kwargs["mode"] = self._mode --> 204 file = self._opener(self._args, *kwargs) 205 if self._mode == "w": 206 # ensure file doesn't get overriden when opened again

netCDF4_netCDF4.pyx in netCDF4._netCDF4.Dataset.init()

netCDF4_netCDF4.pyx in netCDF4._netCDF4._ensure_nc_success()

OSError: [Errno -37] NetCDF: Write to read only: b'https://www.ncei.noaa.gov/thredds/dodsC/OisstBase/NetCDF/V2.0/AVHRR/201703/avhrr-only-v2.20170322.nc' ```