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\86150\Desktop\text.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(r"C:\Users\86150\Desktop\text.txt","a",encoding='utf-8') as file:
+    file.write('小明：10本\n')
+    file.write('小张：15本\n')
+
+with open(r"C:\Users\86150\Desktop\text.txt","r",encoding='utf-8') as file:
+    a=file.read()
+    print(a)
+    file.close()
+
+with open(r"C:\Users\86150\Desktop\text.txt","r",encoding='utf-8') as file:
+    for data in file:
+        if "小强：10本" in data:
+            print("小强数据在文件中")
+        if "小兰：12本" in data:
+            print("小兰数据在文件中")
+        else:
+            print("数据不在文件中")
+            break