save project

diy.py

+file1=open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
+file1.write('小兰:12本\n')
+file1.write('小丽:11本\n')
+file1.write('李文:9本\n')
+file1.write('张伟:16本\n')
+file1.close()
+new_data=''
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8')as file1:
+    for data in file1:
+        #print(data)
+        if '小兰:12本' in data:
+            #print('数据在文件中')  
+            data=data.replace('小兰：12本','小兰：14本')
+        new_data+=data
+with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')as file1:        
+    file1.write(new_data)
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8')as file1:
+    a=file1.read()
+    print(a)
\ No newline at end of file