auto save

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\Administrator\Desktop\aaa.txt",'w',encoding='utf-8') as file:
-    file.write('小兰：12本')
-    file.write('小丽：11本')
-    file.write('李文：9本')
-    file.write('张伟：16本')
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+# # 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\Administrator\Desktop\aaa.txt",'w',encoding='utf-8') as file:
+#     file.write('小兰：12本\n')
+#     file.write('小丽：11本\n')
+#     file.write('李文：9本\n')
+#     file.write('张伟：16本\n')
+# with open(r"c:\Users\Administrator\Desktop\aaa.txt",'a',encoding='utf-8') as file:
+#     file.write('小强：12本\n')
+#     file.write('李明：15本\n')
+# with open(r"c:\Users\Administrator\Desktop\aaa.txt",'r',encoding='utf-8') as file:
+#     a=file.read()
+#     print(a)
+# with open(r"c:\Users\Administrator\Desktop\aaa.txt",'r',encoding='utf-8') as file:
+#     for data in file:
+#         if'小强：10本'in data:
+#             print("小强的数据在文件中")
+#         if'小兰：12本'in data:
+#             print("小兰的数据在文件中")
+with open(r"c:\Users\Administrator\Desktop\aaa.txt",'r',encoding='utf-8') as file:
+    for data in file
+        if'小强：12本\n'in data:
+            data=file.replace('小强：12\n','小强：11\n')
+        if'小兰：12本\n'in data:
+            data=file.replace('小兰：12\n','小兰：14\n')
+        new_data+=data
+with open(r"c:\Users\Administrator\Desktop\aaa.txt",'w',encoding='utf-8') as file:
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