Initial data commit

Task/Remove-duplicate-elements/Python/remove-duplicate-elements-7.py

@@ -0,0 +1,38 @@
+# nubByEq :: (a -> a -> Bool) -> [a] -> [a]
+def nubByEq(eq, xs):
+    def go(yys, xxs):
+        if yys:
+            y = yys[0]
+            ys = yys[1:]
+            return go(ys, xxs) if (
+                elemBy(eq, y, xxs)
+            ) else (
+                [y] + go(ys, [y] + xxs)
+            )
+        else:
+            return []
+    return go(xs, [])
+
+
+# elemBy :: (a -> a -> Bool) -> a -> [a] -> Bool
+def elemBy(eq, x, xs):
+    if xs:
+        return eq(x, xs[0]) or elemBy(eq, x, xs[1:])
+    else:
+        return False
+
+
+xs = [
+    'apple', 'apple',
+    'ampersand', 'aPPLE', 'Apple',
+    'orange', 'ORANGE', 'Orange', 'orange', 'apple'
+]
+for eq in [
+    lambda a, b: a == b,                   # default case sensitive uniqueness
+    lambda a, b: a.lower() == b.lower(),   # case-insensitive uniqueness
+    lambda a, b: a[0] == b[0],             # unique first char (case-sensitive)
+    lambda a, b: a[0].lower() == b[0].lower(),   # unique first char (any case)
+]:
+    print (
+        nubByEq(eq, xs)
+    )