Move _handle attribute up in CloudPath __init__ (#300) (#301)

* Move _handle attribute up in CloudPath __init__

The _handle attribute needs to be set before any code can raise an exception. This is because if something tries to call __del__ after the exception as the process is exiting, _handle must be set to avoid an AttributeError in __del__.

Resolves #299.

* Formatting

Co-authored-by: Bryan Weber <bweber@rebelliondefense.com>

Co-authored-by: Bryan Weber <bryan.w.weber@gmail.com>
Co-authored-by: Bryan Weber <bweber@rebelliondefense.com>

cloudpathlib/cloudpath.py

@@ -166,6 +166,11 @@ class CloudPath(metaclass=CloudPathMeta):
     cloud_prefix: str
 
     def __init__(self, cloud_path: Union[str, "CloudPath"], client: Optional["Client"] = None):
+
+        # handle if local file gets opened. must be set at the top of the method in case any code
+        # below raises an exception, this prevents __del__ from raising an AttributeError
+        self._handle = None
+
         self.is_valid_cloudpath(cloud_path, raise_on_error=True)
 
         # versions of the raw string that provide useful methods
@@ -190,9 +195,6 @@ def __init__(self, cloud_path: Union[str, "CloudPath"], client: Optional["Client
         # track if local has been written to, if so it may need to be uploaded
         self._dirty = False
 
-        # handle if local file gets opened
-        self._handle = None
-
     def __del__(self):
         # make sure that file handle to local path is closed
         if self._handle is not None: