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Lib/site-packages/crispy_forms/base.py

@@ -0,0 +1,22 @@
+class KeepContext:
+    """
+    Context manager that receives a `django.template.Context` instance and a list of keys
+
+    Once the context manager is exited, it removes `keys` from the context, to avoid
+    side effects in later layout objects that may use the same context variables.
+
+    Layout objects should use `extra_context` to introduce context variables, never
+    touch context object themselves, that could introduce side effects.
+    """
+
+    def __init__(self, context, keys):
+        self.context = context
+        self.keys = keys
+
+    def __enter__(self):
+        pass
+
+    def __exit__(self, type, value, traceback):
+        for key in list(self.keys):
+            if key in self.context:
+                del self.context[key]