Feature/pandas api isin

src/pykx/pandas_api/pandas_meta.py

@@ -1,7 +1,6 @@
 from . import api_return
 from ..exceptions import QError
 
-
 def _init(_q):
     global q
     q = _q
@@ -209,7 +208,22 @@ def abs(self, numeric_only=False):
         if numeric_only:
             tab = _get_numeric_only_subtable(self)
         return q.abs(tab)
-
+
+    @api_return
+    def isin(self, values):
+        tab = self
+        dic_value = kx.q("{$[98h = type x; flip x; x]}", values)
+        return q("{flip x! {"
+                    "tipo: abs[type z[x][0]];"
+                    "y: $[99h = type y; y[x]; y];"
+                    "y: y[where tipo = abs type each y];"
+                    "$[count[y] = 0; "
+                         "count[z[x]]#0b;"
+                         "(|/) $[tipo = 10; "
+                                 "y"+"~"+"/:\:z[x];"
+                                 "y"+"="+"\:z[x]]]}[;z;y]"
+                    "each x}", tab.columns, tab, dic_value)
+
     @convert_result
     def all(self, axis=0, bool_only=False, skipna=True):
         res, cols = preparse_computations(self, axis, skipna, bool_only=bool_only)