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projecten1/lib/python3.6/site-packages/PIL/ImageSequence.py

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+#
+# The Python Imaging Library.
+# $Id$
+#
+# sequence support classes
+#
+# history:
+# 1997-02-20 fl     Created
+#
+# Copyright (c) 1997 by Secret Labs AB.
+# Copyright (c) 1997 by Fredrik Lundh.
+#
+# See the README file for information on usage and redistribution.
+#
+
+##
+
+
+class Iterator(object):
+    """
+    This class implements an iterator object that can be used to loop
+    over an image sequence.
+
+    You can use the ``[]`` operator to access elements by index. This operator
+    will raise an :py:exc:`IndexError` if you try to access a nonexistent
+    frame.
+
+    :param im: An image object.
+    """
+
+    def __init__(self, im):
+        if not hasattr(im, "seek"):
+            raise AttributeError("im must have seek method")
+        self.im = im
+        self.position = 0
+
+    def __getitem__(self, ix):
+        try:
+            self.im.seek(ix)
+            return self.im
+        except EOFError:
+            raise IndexError  # end of sequence
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        try:
+            self.im.seek(self.position)
+            self.position += 1
+            return self.im
+        except EOFError:
+            raise StopIteration
+
+    def next(self):
+        return self.__next__()