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'
-file1=open(r"C:\Users\Administrator\Desktop\test.txt",'w',encoding='utf-8')
-file1.write('小强:12本')
-file1.close()
+# file1=open(r"C:\Users\Administrator\Desktop\test.txt",'w',encoding='utf-8')
+# file1.write('小强:12本')
+# file1.close()
 # file1=open(r"C:\Users\Administrator\Desktop\test.txt",'a',encoding='utf-8')
 # file1.write('小蓝:16本\n')
 # file1.close()
-with open(r"C:\Users\Administrator\Desktop\test.txt",'a',encoding='utf-8') as file:
-    file.write('小兰:12本\n')
\ No newline at end of file
+# with open(r"C:\Users\Administrator\Desktop\test.txt",'a',encoding='utf-8') as file:
+#     file.write('小兰:12本\n')
+
+with open(r"C:\Users\Administrator\Desktop\test.txt",'r',encoding='utf-8') as file1:
+    for data in file1:
+        if '小强:10本' in data:
+            data=data.replace('小强:10本','小强:11本')
+        new_data +=data
+with open(r"C:\Users\Administrator\Desktop\test.txt",'w',encoding='utf-8') as file1:
+    file1.write(new_data)