save project

a.py

+with open(r"C:\Users\Administrator\Desktop\test.txt","a",encoding="utf-8")as jmy:
+    jmy.write('小兰：12\n小丽：11\n')
+i=''
+with open(r"C:\Users\Administrator\Desktop\test.txt","r",encoding="utf-8")as jmy:
+    for a in jmy:
+        if '小兰：12' in a:
+            a=a.replace('小兰：12','小兰：15')
+        i+=a
+with open(r"C:\Users\Administrator\Desktop\test.txt","w",encoding="utf-8")as jmy:
+    jmy.write(i)
\ No newline at end of file