dic setdefault

Author: AstinCHOI

3장_컬렉션_데이터_구조/1_setdefault_example.py

@@ -0,0 +1,26 @@
+def usual_dict(dict_data):
+    newdata = {}
+    for k, v in dict_data:
+        if k in newdata:
+            newdata[k].append(v)
+        else:
+            newdata[k] = [v]
+    return newdata
+
+def setdefault_dict(dict_data):
+    newdata = {}
+    for k, v in dict_data:
+        newdata.setdefault(k, []).append(v)
+    return newdata
+
+def test_setdef():
+    dict_data = (('key1', 'value1'),
+               ('key1', 'value2'),
+               ('key2', 'value3'),
+               ('key2', 'value4'),
+               ('key2', 'value5'),)
+    print(usual_dict(dict_data))
+    print(setdefault_dict(dict_data))
+
+if __name__ == '__main__':
+    test_setdef()