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'
+new_data=""
+with open(r'C.\Users\CM\Desktop\book.txt','r',encoding='utf-8') as filel:
+    for data in filel:
+        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\CM\Desktop\book.txt','w',encoding='utf-8') as filel:
+    filel.write(new_data)
+with open(r'C.\Users\CM\Desktop\book.txt','r',encoding='utf-8') as filel:
+    a=filel.read()
+    print(a)
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