Merge pull request matplotlib#25238 from oscargus/animationpathcheck

Check file path for animation and raise if it does not exist

Author: QuLogic

lib/matplotlib/animation.py

@@ -193,6 +193,8 @@ def setup(self, fig, outfile, dpi=None):
             The DPI (or resolution) for the file.  This controls the size
             in pixels of the resulting movie file.
         """
+        # Check that path is valid
+        Path(outfile).parent.resolve(strict=True)
         self.outfile = outfile
         self.fig = fig
         if dpi is None:
@@ -405,6 +407,8 @@ def setup(self, fig, outfile, dpi=None, frame_prefix=None):
             deleted by `finish`; if not *None*, no temporary files are
             deleted.
         """
+        # Check that path is valid
+        Path(outfile).parent.resolve(strict=True)
         self.fig = fig
         self.outfile = outfile
         if dpi is None:
@@ -423,7 +427,7 @@ def setup(self, fig, outfile, dpi=None, frame_prefix=None):
         self.fname_format_str = '%s%%07d.%s'
 
     def __del__(self):
-        if self._tmpdir:
+        if hasattr(self, '_tmpdir') and self._tmpdir:
             self._tmpdir.cleanup()
 
     @property

lib/matplotlib/tests/test_animation.py

@@ -506,3 +506,13 @@ def test_disable_cache_warning(anim):
         )
     assert anim._cache_frame_data is False
     anim._init_draw()
+
+
+def test_movie_writer_invalid_path(anim):
+    if sys.platform == "win32":
+        match_str = re.escape("[WinError 3] The system cannot find the path specified:")
+    else:
+        match_str = re.escape("[Errno 2] No such file or directory: '/foo")
+    with pytest.raises(FileNotFoundError, match=match_str):
+        _ = anim.save("/foo/bar/aardvark/thiscannotreallyexist.mp4",
+                      writer=animation.FFMpegFileWriter())