docs: add python snippets

src/actionsheets/data/python/collections/dict.toml

@@ -161,6 +161,10 @@ code = "next(k for k in x if x[k] == v)"
 action = "All keys with value _v_"
 code = "[k for k in x if x[k] == v]"
 
+[extract.index.key]
+action = "Get index of key _k_"
+code = "list(x.keys()).index(k)"
+
 
 [update]
 section = "Update"

src/actionsheets/data/python/collections/list.toml

@@ -185,6 +185,13 @@ code = "x[0]"
 action = "Last element"
 code = "x[-1]"
 
+[extract.elem.sample]
+action = "Random element"
+code = """
+import random
+random.choice(x)
+"""
+
 [extract.elem.count]
 action = "Number of occurrences of element"
 code = "x.count(e)"
@@ -470,6 +477,13 @@ code = "x[:n]"
 action = "Last _n_ elements (tail)"
 code = "x[-n:]"
 
+[derive.shrink.sample]
+action = "Select _n_ elements at random"
+code = """
+import random
+random.choices(x, k=n)
+"""
+
 [derive.shrink.indices]
 action = "List of elements from a list of indices"
 code = "[x[i] for i in indices]"