save project

jack.py

+new_date=''
+with open(r'C:\Users\Administrator\Desktop\book.txt',"r",encoding='utf-8') as file:
+    for date in file:
+        if '123321'in date:
+            date = date.replace('123321','456654')
+        new_date += date
+with open(r'C:\Users\Administrator\Desktop\book.txt',"w",encoding='utf-8') as file:
+    file.write(new_date)
+
+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