PythonCHB
diff --git a/‎Solutions/Session01/codingbat/Warmup-1/pos_neg.py‎
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+#!/usr/bin/env python
+
+
+def pos_neg(a, b, negative):
+    if negative:
+        return a < 0 and b < 0
+    else:
+        return (a < 0 and b > 0) or (a > 0 and b < 0)
+
+if __name__ == "__main__":
+    # run some tests if run as script
+    # (from the codingbat site -- not all, I got bored)
+    assert pos_neg(1, -1, False) is True
+    assert pos_neg(-1, 1, False) is True
+    assert pos_neg(-4, -5, True) is True
+    assert pos_neg(-4, -5, False) is False
+    assert pos_neg(-4, -5, True) is True
+
+    assert pos_neg(-6, -6, False) is False
+    assert pos_neg(-2, -1, False) is False
+    assert pos_neg(1, 2, False) is False
+    assert pos_neg(-5, 6, True) is False
+    assert pos_neg(-5, -5, True) is True
+
+
+
+    print "all tests passed"