auto save

1.py

+arr=['1','2','3','4','5','6','7','8','9']
+# for i in range(len(arr)):
+#     print(arr[i])   
+for i in arr:
+    print(i) 
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diy.py

+# 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
+with open(r'C:\Users\CM\Desktop\book.txt','a',encoding='utf-8') as file:
+    file.write('小强，999999999本\n')
+    file.write('李敏，10本\n')
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