started work on backend

2019-01-21 17:36:00 +01:00
parent a1a8bca34b
commit 9f9a7e4974
4032 changed files with 745079 additions and 0 deletions
@@ -0,0 +1,27 @@
+try:
+    from collections import ChainMap
+except ImportError:
+    from pandas.compat.chainmap_impl import ChainMap
+
+
+class DeepChainMap(ChainMap):
+
+    def __setitem__(self, key, value):
+        for mapping in self.maps:
+            if key in mapping:
+                mapping[key] = value
+                return
+        self.maps[0][key] = value
+
+    def __delitem__(self, key):
+        for mapping in self.maps:
+            if key in mapping:
+                del mapping[key]
+                return
+        raise KeyError(key)
+
+    # override because the m parameter is introduced in Python 3.4
+    def new_child(self, m=None):
+        if m is None:
+            m = {}
+        return self.__class__(m, *self.maps)