id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1033225587,PR_kwDOAMm_X84tiDCA,5884,Handle single `PathLike` objects in `open_mfdataset()`,411196,closed,0,,,3,2021-10-22T06:27:44Z,2021-10-26T20:18:13Z,2021-10-26T14:49:25Z,CONTRIBUTOR,,0,pydata/xarray/pulls/5884,"- [x] Closes #5881
- [x] Tests added
- [x] Passes `pre-commit run --all-files`
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`
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1032233673,I_kwDOAMm_X849hqLJ,5881,`open_mfdataset` does not handle single `pathlib.Path` objects but handles single `str` just fine,411196,closed,0,,,2,2021-10-21T08:56:20Z,2021-10-26T14:49:25Z,2021-10-26T14:49:25Z,CONTRIBUTOR,,,,"
**What happened**:

An exception was raised

**What you expected to happen**:

That a dataset object would be created.

**Minimal Complete Verifiable Example**:

```python
from pathlib import Path

import xarray as xr

dataset = ""xarray/tests/data/example_1.nc""

with xr.open_mfdataset(dataset) as actual:
    assert isinstance(actual, xr.Dataset)

with xr.open_mfdataset(Path(dataset)) as actual:
    assert isinstance(actual, xr.Dataset)  # this fails
```
with the following traceback
```
Traceback (most recent call last):
  File ""<stdin>"", line 1, in <module>
  File ""/home/panos/Prog/git/xarray/xarray/backends/api.py"", line 869, in open_mfdataset
    paths = [str(p) if isinstance(p, Path) else p for p in paths]
TypeError: 'PosixPath' object is not iterable
```

**Anything else we need to know?**:

This seems to be fixing it, but I am not familiar with the codebase to know if this is the proper way to fix it

```diff
diff --git a/xarray/backends/api.py b/xarray/backends/api.py
index 6d73946b..596ac249 100644
--- a/xarray/backends/api.py
+++ b/xarray/backends/api.py
@@ -838,6 +838,8 @@ def open_mfdataset(
     .. [1] http://xarray.pydata.org/en/stable/dask.html
     .. [2] http://xarray.pydata.org/en/stable/dask.html#chunking-and-performance
     """"""
+    if isinstance(paths, Path):
+        paths = paths.as_posix()
     if isinstance(paths, str):
         if is_remote_uri(paths) and engine == ""zarr"":
             try:
```

**Environment**:

<details><summary>Output of <tt>xr.show_versions()</tt></summary>

```
>>> xr.show_versions()

INSTALLED VERSIONS
------------------
commit: 07de257c5884df49335496ee6347fb633a7c302c
python: 3.9.7 (default, Aug 31 2021, 13:28:12) 
[GCC 11.1.0]
python-bits: 64
OS: Linux
OS-release: 5.14.12-arch1-1
machine: x86_64
processor: 
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: ('en_US', 'UTF-8')
libhdf5: 1.12.0
libnetcdf: 4.7.4

xarray: 999
pandas: 1.3.4
numpy: 1.21.3
scipy: None
netCDF4: 1.5.7
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: None
cftime: 1.5.1
nc_time_axis: None
PseudoNetCDF: None
rasterio: None
cfgrib: None
iris: None
bottleneck: None
dask: 2021.09.1
distributed: None
matplotlib: None
cartopy: None
seaborn: None
numbagg: None
fsspec: 2021.10.1
cupy: None
pint: None
sparse: None
setuptools: 57.4.0
pip: 21.3
conda: None
pytest: 6.2.5
IPython: None
sphinx: None
```
</details>
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