save project

1.py

-file1=open(r"C:\Users\噜噜\Desktop\txt.txt",'w',encoding='utf-8')
-file1.write('小兰：12本')
-file1.close()
-file1=open(r"C:\Users\噜噜\Desktop\txt.txt",'a',encoding='utf-8') 
-file1.write('小：12本')
-file1.close()
-file1=open(r"C:\Users\噜噜\Desktop\txt.txt",'r',encoding='utf-8')
-for i in file1:
-    if '小兰：12本' in i:
-        print('ok')
+st=' '
+with open(r"C:\Users\噜噜\Desktop\txt.txt",'r',encoding='utf-8')as file1:
+    for i in file1:
+        if '小兰：12本' in i:
+            i=i.replace('小兰：12本','小兰：11本')
+        st+=i
+with open(r"C:\Users\噜噜\Desktop\txt.txt",'w',encoding='utf-8')as file1:
+    file1.write(st)       
+   
+