save project

diy.py

+n_d=''
+with open(r'C:\Users\Administrator\Desktop\ll.txt','a',encoding='utf-8') as l:
+    l.write('小兰:10本\n')
+    l.write('小强:13本\n')
+    l.write('李明:15本\n')
+with open(r'C:\Users\Administrator\Desktop\ll.txt','r',encoding='utf-8') as l:
+    for d in l:
+        if '小强:13本' in d:
+            d=d.replace('3','1')
+        n_d+=d
+with open(r'C:\Users\Administrator\Desktop\ll.txt','w',encoding='utf-8') as l:
+    l.write(n_d)
\ No newline at end of file