Added pick and select for lists

Pick: (1 2 3 4)?4 or (1 2 3 4)?(3 2)
Select: (1 2 3 4)~2 or (1 2 3 4)~(2 3)

ziffers/classes/items.py

@@ -433,7 +433,7 @@ class RomanNumeral(Event):
     pitch_classes: list = field(default=None, init=False)
     inversions: int = field(default=None)
     evaluated_chord: Chord = None
-
+    
     def set_notes(self, chord_notes: list[int]):
         """Set notes to roman numeral
 

ziffers/classes/sequences.py

@@ -2,6 +2,7 @@
 from dataclasses import dataclass, field, replace
 from itertools import product
 from math import floor
+import random
 from types import LambdaType
 from copy import deepcopy
 import operator
@@ -403,6 +404,47 @@ class ListOperation(Sequence):
 
             return flattened_list
 
+        def _pick_from_list(left, right, options):
+            """Pick random numbers from a list"""
+            if isinstance(left, Sequence):
+                left = _filter_operation(left, options)
+            
+            if isinstance(right, Sequence):
+                right = _filter_operation(right, options)
+            
+            if not isinstance(right, (list, Sequence)):
+                right = Sequence(values=[right])
+            
+            result = []
+
+            for num in right.values:
+                for _ in range(num.get_value(options)):
+                    result.append(random.choice(left.values))
+            return flatten(result)
+        
+
+        def _select_from_list(left, right, options):
+            """Select number of items from shuffled list"""
+            if isinstance(left, Sequence):
+                left = _filter_operation(left, options)
+            
+            if isinstance(right, Sequence):
+                right = _filter_operation(right, options)
+            
+            if not isinstance(right, (list, Sequence)):
+                right = Sequence(values=[right])
+            
+            result = []
+            left = left.values
+
+            for num in right.values:
+                random.shuffle(left)
+                num = num.get_value(options)
+                new_list = [left[i % len(left)] for i in range(num)]
+                result += new_list
+                
+            return flatten(result)
+
         def _vertical_arpeggio(left, right, options):
             """Vertical arpeggio operation, eg. (135)@(q 1 2 021)"""
             left = _filter_operation(left, options)
@@ -537,8 +579,13 @@ class ListOperation(Sequence):
                     left = _vertical_arpeggio(left, right, options)
                 elif operation == "horizontal":
                     left = _horizontal_arpeggio(left, right, options)
-                if operation == "zip":
+                elif operation == "zip":
                     left = _cyclic_zip(left, right, options)
+                elif operation == "pick":
+                    left = _pick_from_list(left, right, options)
+                elif operation == "select":
+                    left = _select_from_list(left, right, options)
+                
             else:
                 left = _python_operations(left, right, options)
         return left