save project

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:\panyuxuan\test.txt",'a',encoding='utf-8')
-file1.write("李明：15本\n")
-file1.write("小强：10本\n")
-file1.close()
+# file1=open(r"C:\panyuxuan\test.txt",'a',encoding='utf-8')
+# file1.write("李明：15本\n")
+# file1.write("小强：10本\n")
+# file1.close()
 
-# with open(r"C:\panyuxuan\test.txt","a",encoding='utf-8') as file1:
-#     file1.write("李明：15本\n")
-#     file1.write("小强：10本\n")
\ No newline at end of file
+with open(r"C:\panyuxuan\test.txt","a",encoding='utf-8') as file1:
+    file1.write("李明：15本\n")
+    file1.write("小强：10本\n")
\ No newline at end of file

diy1.py

+new_data=""
+with open(r"C:\panyuxuan\test.txt","r",encoding='utf-8') as files:
+    for data in files:
+        if "小强：10本" in data:
+            data=data.replace("小强：10本",'小强：11本')
+        new_data+=data
+with open(r"C:\panyuxuan\test.txt","w",encoding='utf-8') as files:
+    files.write(new_data)
+with open(r"C:\panyuxuan\test.txt","r",encoding='utf-8') as files:
+    a=files.read()
+    print(a)
+