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\cnm_sb,'a','utf-8')
+# file1.write('小兰：12本')
+# file1.close()
+new_data=''
+with open(r"C:\Users\Administrator\Desktop\xxx.txt",'w',encoding='utf-8') as file:
+    file.write("小丽:12本\n")
+    file.write("小强：10本\n")
+with open(r"C:\Users\Administrator\Desktop\xxx.txt",'r',encoding='utf-8') as file:
+    # a=file.read()
+    # print(a)
+    for data in file:
+        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\xxx.txt",'w',encoding='utf-8') as file:
+    file.write(new_data)