save project

C:\Users\liuguangyun\Desktop\book.txt

+小兰:14本 
+小兰:14本 
+小丽:11本 
+李文:9本 
+张伟:16本 
+小强：11本 
+李明：15本 

diy.py

+# file1=open(r'C:\Users\liuguangyun\Desktop\book.txt','a',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.write('小强：12本 \n')
+# file1.write('李明：15本 \n')
+# file1.close
+
+new_data=''
+with open(r'C:\Users\liuguangyun\Desktop\book.txt','r',encoding='utf-8') as file:
+    for i in file:
+        if '小强：12本' in i:
+            i = i.replace('小强：12本','小强：11本')
+        if '小兰:12本' in i:
+            i = i.replace('小兰:12本','小兰:14本')
+        new_data += i
+
+with open(r'C:\Users\liuguangyun\Desktop\book.txt','w',encoding='utf-8') as file:
+    file.write(new_data)
+
+with open(r'C:\Users\liuguangyun\Desktop\book.txt','r',encoding='utf-8') as file:
+    a = file.read()
+    print(a)
+
+
+
+
+