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'
+# file = open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
+
+# file.write('小兰:12本\n')
+# file.write('小丽:11本\n')
+# file = open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
+# file.write('小强:10本\n')
+# file.write('李明:15本\n')
+# with open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8') as file:
+#     file.writene('小兰:12本\n')
+# #file.close()
+new_data=''
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file:
+    for data in file:
+        if '小强:10本' in data:
+            data=data.replace('小强:10本','小强:11本')
+        if '小兰:12本' in data:
+            data=data.replace('小兰:12本','小兰:14本')
+        new_data += data
+with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file:
+    a = file.read()
+    print(a)