auto save

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("username:")
+    password = input("password:")
+    if name == username and password == userpassword:
+        print("Succeed!")
+        break
+    elif name != username:
+        print("worng username")
+    else:
+        print("worng password")
+print("welcome!")
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