add sd.py

sd.py

@@ -0,0 +1,16 @@
+import numpy as np 
+import pandas as pd
+
+a = np.arange(1000)
+
+l = set([ f"{i:03d}" for i in a ])
+
+sum_dict = dict()
+print(len(l))
+for i in l:
+    _sum = sum(map(int, i))
+    v = sum_dict.get(_sum, 0)
+    sum_dict[_sum] = v + 1
+
+df = pd.Series(sum_dict)
+print(df.sort_values(ascending=False))