save project

day4.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\玛酷机器人3\Documents\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(r"C:\Users\玛酷机器人3\Documents\test.txt",'a',encoding='utf-8') as file:
+#     file.write("小虎：23本\n")
+new_data=""
+with open(r"C:\Users\玛酷机器人3\Documents\test.txt",'r',encoding='utf-8') as file:
+    for data in file:
+        if "小兰：10本" in data:
+            data = data.replace("小兰：12本","小兰：14本")
+        new_data += data
+
+with open(r"C:\Users\玛酷机器人3\Documents\test.txt",'w',encoding='utf-8') as file:
+    file.write(new_data)