--- a/env/lib/python3.7/site-packages/galaxy/util/expressions.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,57 +0,0 @@
-"""
-Expression evaluation support.
-
-For the moment this depends on python's eval. In the future it should be
-replaced with a "safe" parser.
-"""
-
-from collections import MutableMapping
-from itertools import chain
-
-
-class ExpressionContext(MutableMapping):
-    def __init__(self, dict, parent=None):
-        """
-        Create a new expression context that looks for values in the
-        container object 'dict', and falls back to 'parent'
-        """
-        self.dict = dict
-        self.parent = parent
-
-    def __delitem__(self, key):
-        if key in self.dict:
-            del self.dict[key]
-        elif self.parent is not None and key in self.parent:
-            del self.parent[key]
-
-    def __iter__(self):
-        return chain(iter(self.dict), iter(self.parent or []))
-
-    def __len__(self):
-        return len(self.dict) + len(self.parent or [])
-
-    def __getitem__(self, key):
-        if key in self.dict:
-            return self.dict[key]
-        if self.parent is not None and key in self.parent:
-            return self.parent[key]
-        raise KeyError(key)
-
-    def __setitem__(self, key, value):
-        self.dict[key] = value
-
-    def __contains__(self, key):
-        if key in self.dict:
-            return True
-        if self.parent is not None and key in self.parent:
-            return True
-        return False
-
-    def __str__(self):
-        return str(self.dict)
-
-    def __bool__(self):
-        if not self.dict and not self.parent:
-            return False
-        return True
-    __nonzero__ = __bool__