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()
 siu=[]    
 siu=[]    
-for i in a:
-    data=i.split()
-    sum=0
-    for j in data[1:]:
-        sum=sum+int(j)
-    k=data[0]+str(sum)+'\n'
-    siu.append(k)
+for i in a:#用for...in...把每一行遍历
+    data=i.split()#把字符串切分成更细的一个一个的字符串
+    sum=0#先把总钱设为0
+    for j in data[1:]:#遍历列表中的第1个数据和最后一个数据
+        sum=sum+int(j)#然后依次加起来，但j是字符串，所以要转
+    k=data[0]+str(sum)+'\n'#结果就是学生姓名和总义卖款，后面加上换行符，写入时更清晰
+    siu.append(k)#每次都把结果补充到列表中
 with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','a',encoding='utf-8') as file:
 with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','a',encoding='utf-8') as file:
     file.writelines(siu)
     file.writelines(siu)