save project

diy.py

 with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as file:
 with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as file:
     a=file.readlines()
     a=file.readlines()
+final_sum=[]
+for i in a:
+    date=i.strip()
+    sum=0
+    for sale in date[1:]:
+        sum+=int(sale)
+    result=date[0]+str(sum)+'\n'
+    final_sum.append(result)
+with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','a',encoding='utf-8') as file2:
+    file2.writelines(final_sum)