Force ragged lists into object-arrays in _reshape_2D.

QuLogic · QuLogic · commit 73ab7fa83111 · 2020-05-05T19:26:19.000-04:00
Unfortunately, callers to this function allow both styles and we need to
accept them and cast to continue supporting it.
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
@@ -1333,7 +1333,16 @@ def _reshape_2D(X, name):
     *name* is used to generate the error message for invalid inputs.
     """
     # Iterate over columns for ndarrays, over rows otherwise.
-    X = np.atleast_1d(X.T if isinstance(X, np.ndarray) else np.asarray(X))
+    if isinstance(X, np.ndarray):
+        X = X.T
+    else:
+        try:
+            X = np.asarray(X)
+        except np.VisibleDeprecationWarning:
+            # NumPy 1.19 does not allow implicit ragged-array conversion,
+            # but callers to this function do.
+            X = np.asarray(X, dtype=object)
+    X = np.atleast_1d(X)
     if len(X) == 0:
         return [[]]
     elif X.ndim == 1 and np.ndim(X[0]) == 0:
