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("test.txt","w",encoding="utf-8")
+file.write('小兰：12本\n')
+file.write('小丽：11本\n')
+file.write('李文：9本\n')
+file.write('张伟：16本\n')
+file.close()
+
+with open("test.txt","a",encoding="utf-8") as file1:
+    file1.write("嘻嘻哈哈")
+
+with open("test.txt","r",encoding="utf-8") as file2:
+    date = file2.read()
+    if "嘻嘻哈哈" in date:
+        date.replace("嘻嘻哈哈","嘿嘿吼吼")
+        print(date)
+
+with open("test.txt","w",encoding="utf-8") as file3:
+    file3.write(date)
\ No newline at end of file

test.txt

+小兰：12本
+小丽：11本
+李文：9本
+张伟：16本
+嘻嘻哈哈
\ No newline at end of file