Add pythonic aliases for comparison predicates.

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+### v0.17.7
+* Add pythonic aliases for comparison predicates.
+* Add alias tests to test_predicates.py
+
 ### v0.17.6
 * Removed a deprecated function which allowed calling non-table attributes on a table.
 * Removed a deprecated function which created an empty table.

datascience/predicates.py

@@ -211,6 +211,49 @@ def not_containing(substring):
     def not_contained_in(superstring):
         """A string that is not contained within the superstring"""
         return -(are.contained_in(superstring))
+
+    ###############
+    #   Aliases   #
+    ###############
+
+    @staticmethod
+    def less_than(y):
+        """Less than y."""
+        return are.below(y)
+
+    @staticmethod
+    def greater_than(y):
+        """Greater than y."""
+        return are.above(y)
+
+    @staticmethod
+    def greater_than_or_equal_to(y):
+        return are.above_or_equal_to(y)
+
+    @staticmethod
+    def less_than_or_equal_to(y):
+        return are.below_or_equal_to(y)
+
+    @staticmethod
+    def not_greater_than_or_equal_to(y):
+        """Is neither above y nor equal to y"""
+        return are.not_above_or_equal_to(y)
+
+    @staticmethod
+    def not_less_than_or_equal_to(y):
+        """Is neither below y nor equal to y"""
+        return are.not_below_or_equal_to(y)
+
+    @staticmethod
+    def not_greater_than(y):
+        """Is not above y"""
+        return are.not_above(y)
+
+    @staticmethod
+    def not_less_than(y):
+        """Is not below y"""
+        return are.not_below(y)
+
 ###############
 # Combination #
 ###############

tests/test_predicates.py

@@ -73,6 +73,46 @@ def test_between_or_equal_to():
     ps = [p(x) for x in range(1, 6)]
     assert ps == [False, False, True, False, False]
 
+#############
+#  Aliases  #
+#############
+
+def test_greater_than_and_less_than():
+    """Both f and g."""
+    p = are.greater_than(2) & are.less_than(4)
+    ps = [p(x) for x in range(1, 6)]
+    assert ps == [False, False, True, False, False]
+
+def test_greater_than_or_less_than():
+    """Either f or g."""
+    p = are.greater_than(3) | are.less_than(2)
+    ps = [p(x) for x in range(1, 6)]
+    assert ps == [True, False, False, True, True]
+
+def test_greater_than():
+    """Greater than y."""
+    p = are.greater_than(3)
+    ps = [p(x) for x in range(1, 6)]
+    assert ps == [False, False, False, True, True]
+
+def test_less_than():
+    """Less than y."""
+    p = are.not_less_than(4)
+    ps = [p(x) for x in range(1, 6)]
+    assert ps == [False, False, False, True, True]
+
+def test_greater_than_or_equal_to():
+    """Greater than or equal to y."""
+    p = are.greater_than_or_equal_to(4)
+    ps = [p(x) for x in range(1, 6)]
+    assert ps == [False, False, False, True, True]
+
+def test_less_than_or_equal_to():
+    """Less than or equal to y."""
+    p = are.not_less_than_or_equal_to(3)
+    ps = [p(x) for x in range(1, 6)]
+    assert ps == [False, False, False, True, True]
+
 
 ############
 # Doctests #