[1] add linked list phonebook implementation

KislyuninED/docks/data/1-st-exercize/main.py

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+# phonebook.py
+
+# Узел списка: {'n': имя, 'p': телефон, 'nxt': следующий}
+def ll_insert(head, name, phone):
+    # обновление, если уже есть
+    curr = head
+    while curr is not None:
+        if curr['n'] == name:
+            curr['p'] = phone
+            return head
+        curr = curr['nxt']
+    # вставка в начало (новый узел становится головой)
+    new_node = {'n': name, 'p': phone, 'nxt': head}
+    return new_node
+
+def ll_find(head, name):
+    curr = head
+    while curr is not None:
+        if curr['n'] == name:
+            return curr['p']
+        curr = curr['nxt']
+    return None
+
+def ll_delete(head, name):
+    if head is None:
+        return None
+    if head['n'] == name:
+        return head['nxt']
+    prev = head
+    curr = head['nxt']
+    while curr is not None:
+        if curr['n'] == name:
+            prev['nxt'] = curr['nxt']
+            return head
+        prev = curr
+        curr = curr['nxt']
+    return head
+
+def ll_list_all(head):
+    records = []
+    curr = head
+    while curr is not None:
+        records.append((curr['n'], curr['p']))
+        curr = curr['nxt']
+    records.sort(key=lambda x: x[0])
+    return records