Add Vector.str.contains shorthand

Author: otsaloma

NEWS.md

@@ -1,3 +1,8 @@
+PENDING: Dataiter 1.3
+=====================
+
+* `Vector.str.contains`: New proxy method (equivalent to find(x) > -1)
+
 2025-10-05: Dataiter 1.2
 ========================
 

dataiter/test/test_vector.py

@@ -508,6 +508,11 @@ def test_str(self):
         assert a.str.str_len().tolist() == [4, 4]
         assert a.str.upper().tolist() == ["ASDF", "1234"]
 
+    def test_str_contains(self):
+        a = Vector(["asdf", "1234"])
+        assert a.str.contains("df").tolist() == [True, False]
+        assert a.str.contains("23").tolist() == [False, True]
+
     def test_tail(self):
         a = Vector([1, 2, 3, 4, 5])
         assert a.tail(3).tolist() == [3, 4, 5]

dataiter/vector.py

@@ -88,6 +88,7 @@ def __init__(self, vector):
         self.add = wrap("add")
         self.capitalize = wrap("capitalize")
         self.center = wrap("center")
+        self.contains = lambda x: self.find(x) > -1
         self.count = wrap("count")
         self.decode = wrap("decode")
         self.encode = wrap("encode")