save project

diy.py

+new_data=''
+with open(r"C:\Users\yy\Desktop\book.txt",'r',encoding='utf-8') as fiel1:
+    for data in fiel1:
+        if '小强：10本' in data:
+            data=data.replace('小强：10本','小强：12本')
+        if '小兰：12本' in data:
+            data=data.replace('小兰：12本','小兰：14本')
+with open(r"C:\Users\yy\Desktop\book.txt",'w',encoding='utf-8') as fiel1:
+    fiel1.write(new_data)
+with open(r"C:\Users\yy\Desktop\book.txt",'r',encoding='utf-8') as fiel1:
+    a=fiel1.read()
+    print(a)