[1] start 1-st-exercise

BoriskovaDV/docs/data/1-st-exercise/linked_list_phonebook.py

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+def create_node(name, phone):
+    return {'name': name, 'phone': phone, 'next': None}
+
+def ll_insert(head, name, phone):
+    current = head
+    while current is not None:
+        if current['name'] == name:
+            current['phone'] = phone
+            return head
+        current = current['next']
+    
+    new_node = create_node(name, phone)
+    
+    if head is None:
+        return new_node
+    
+    current = head
+    while current['next'] is not None:
+        current = current['next']
+    current['next'] = new_node
+    return head
+
+def ll_find(head, name):
+    current = head
+    while current is not None:
+        if current['name'] == name:
+            return current['phone']
+        current = current['next']
+    return None
+
+def ll_delete(head, name):
+    if head is None:
+        return None
+    
+    if head['name'] == name:
+        return head['next']
+    
+    prev = head
+    current = head['next']
+    while current is not None:
+        if current['name'] == name:
+            prev['next'] = current['next']
+            return head
+        prev = current
+        current = current['next']
+    return head
+
+def ll_list_all(head):
+    records = []
+    current = head
+    while current is not None:
+        records.append((current['name'], current['phone']))
+        current = current['next']
+    records.sort(key=lambda pair: pair[0])
+    return records
+
+if __name__ == '__main__':
+    head = None
+    head = ll_insert(head, 'Иван', '123-456')
+    head = ll_insert(head, 'Борис', '789-012')
+    head = ll_insert(head, 'Анна', '345-678')
+    head = ll_insert(head, 'Иван', '111-222')
+    print(ll_list_all(head))
+    print(ll_find(head, 'Иван'))
+    print(ll_find(head, 'Петр'))
+    head = ll_delete(head, 'Борис')
+    print(ll_list_all(head))