save project

f.py

+new_data=''
+with open(r"C:\Users\Administrator\Desktop\新建文本文档.txt","r",encoding="utf-8") as file1:    
+    for data in file1:
+        if 'xxx:100' in data:
+            data=data.replace('xxx:100','xxx:1000')
+        new_data +=data
+
+with open(r"C:\Users\Administrator\Desktop\新建文本文档.txt","w",encoding="utf-8") as file1:
+    file1.write(new_data)
\ No newline at end of file