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\EDZ\Desktop\bai.txt","w",encoding="utf-8")
+file1.write("小兰：12本")
+file1.write("小丽：11本")
+file1.write("李文：9本")
+file1.write("张伟：16本")
+file1.close()
+
+with open(r"C:\Users\EDZ\Desktop\bai.txt","a",encoding="utf-8") as dabai:
+
+    dabai.write("李文：9本")
+with open(r"C:\Users\EDZ\Desktop\bai.txt","r",encoding="utf-8") as dabai3:
+    if "李文：9本" in data :
+    data.replace("李文：9本""李文：1000000本")
+with open(r"C:\Users\EDZ\Desktop\bai.txt","w",encoding="utf-8") as dabai4:
+    dabai4.write(data)
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