save project

diy.py

+with open(r'c:\Users\Administrator\Desktop\sales_list.txt','w',encoding='utf-8')as s:
+    for i in range(20):
+        s.write(str(i))
 with open(r'c:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8')as s:
 with open(r'c:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8')as s:
-    hkd=s.read()
-    print(hkd)
+    n=s.read()
+    print(type(n[3:5]))
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