save project

diy4.py

+new_data = ''
+with open(r"C:\Users\Administrator\Desktop\book.txt",'r',encoding='utf-8') as file:
+    for data in file:
+        if '小强：10本' in data:
+            data = data.replace('小强：10本','小强：11本')
+        new_data += data
+
+# print(new_data)
+
+with open(r"C:\Users\Administrator\Desktop\book.txt",'w',encoding='utf-8') as file:
+    file.write(new_data)
+
+with open(r"C:\Users\Administrator\Desktop\book.txt",'r ',encoding='utf-8') as file:
+    a = file.read()
+    print(a)
\ No newline at end of file