From 0c0755cd6087679207063d2d31fed9a2cda23f31 Mon Sep 17 00:00:00 2001
From: Haidong Ji
Date: Sat, 9 Mar 2019 19:44:21 -0600
Subject: Phone book done!

---
 sources/phone_book.py | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 sources/phone_book.py

diff --git a/sources/phone_book.py b/sources/phone_book.py
new file mode 100644
index 0000000..7b2b20a
--- /dev/null
+++ b/sources/phone_book.py
@@ -0,0 +1,36 @@
+# python3
+
+
+class Query:
+    def __init__(self, query):
+        self.type = query[0]
+        self.number = int(query[1])
+        if self.type == 'add':
+            self.name = query[2]
+
+
+def read_queries():
+    n = int(input())
+    return [Query(input().split()) for i in range(n)]
+
+
+def write_responses(result):
+    print('\n'.join(result))
+
+
+def process_queries(queries):
+    result = []
+    # Keep list of all existing (i.e. not deleted yet) contacts.
+    contacts = ['not found'] * 10000000
+    for cur_query in queries:
+        if cur_query.type == 'add':
+            contacts[cur_query.number] = cur_query.name
+        elif cur_query.type == 'del':
+            contacts[cur_query.number] = 'not found'
+        else:
+            result.append(contacts[cur_query.number])
+    return result
+
+
+if __name__ == '__main__':
+    write_responses(process_queries(read_queries()))
-- 
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